Manual, Continuous Rotation Mounts

Lockable Rotation Mounts for Ø1/2", Ø1", and Ø2" Optics
All Models Offer 360° Rotation
SM-Threaded Optic Bores

RSP2D

Ø2" Rotation Mount with Adjustable Zero

MRM05

Ø1/2" Mini-Series Rotation Mount

DLM1

Ø1" Dual Rotation Mount

RSP1X15

Indexing Rotation Mount for Discrete 15° Rotation

Application Idea

CLR1 Rotation Mount Lets Optic Rotate While Both Lens Tubes Remain Fixed (All Sold Separately)

LRM1

Ø1" Rotation Mount, External SM1 Threads

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Overview
Threading Specs
Vernier Scales
Feedback
Rotation Mounts and Stages

Features

Rotation Mounts with 360° Continuous Rotation
Rotational Position Lockable via Setscrew
Full 360° Engraved Scale Marked in 2° Increments
For Mounting Options, See Table Below

Thorlabs offers a diverse line of continuous rotation mounts to accommodate a variety of optic sizes and applications. These mounts provide smooth, backlash-free rotation in compact, lockable packages. To mount an optic, simply place it within the central SM-threaded bore and secure it using a spanner wrench with the included retaining ring. Rotation mounts are available for Ø1/2", Ø1", and Ø2" optics. An easy-to-read radial scale offers 2° graduation marks, labeled every 20°, for precise incremental movement and repeatable positioning.

Standard rotation mounts, including the MRM05(/M), RSP05(/M), RSP1(/M), and RSP2(/M) are post mountable, and feature a locking screw to fix the rotational position. The MRM05(/M) and RSP05(/M) rotation mounts hold Ø1/2" optics, and the MRM05(/M) can be used with our Mini-Series Optical Assemblies. The RSP1D(/M) and RSP2D(/M) rotation mounts hold Ø1" or Ø2" optics, respectively, and offer similar functionality to our standard rotation mounts with the added feature of a rotatable dial: the front dial face can be rotated separately from the optic cell and then locked down. This allows the engraved scale to be aligned with an axis of the optic, such as the fast axis of a wave plate.

The CRM05 and LRM1 rotation mounts hold Ø1/2" or Ø1" optics, respectively, and feature external SM1 (1.035"-40) threads for integrating optics into SM1 lens tube or 30 mm cage cube systems. The front dial face rotates the optic inside the mount, but the external SM1 threads are fixed.

The CLR1(/M) rotation mount is designed to orient rotationally sensitive Ø1" optics within SM1 lens tube systems. Round cylindrical lenses, wave plates, and other polarization optics are commonly used with this mount. Unlike our other rotation mounts, the CLR1(/M) allows for lens tubes to be attached to either end and remain stationary as the mounted optic is rotated.

For applications that require rotation in discrete increments, we offer the RSP1X15(/M) and RSP1X225(/M) mounts for Ø1" optics. These mounts have a top-located setscrew [5/64" (2.0 mm) hex] that, when loosened, allows for continuous 360° motion. With the setscrew tightened, the mount can be rotated through a number of indexed positions in discrete increments.

The DLM1(/M) dual rotation mount features two independently rotating optic carriages that allow two optics to be mounted in close proximity. The carriages are magnetically attached to the main body of the mount so that they can be removed and replaced as needed. Extra optic carriages are available separately.

Thorlabs also offers rotation mounts that are compatible with our 16 mm, 30 mm, and 60 mm cage systems. For demanding applications, we offer high-resolution, micrometer-driven rotation mounts providing roughly 2.4 arcmin per micrometer division. Please see the Rotation Mounts and Stages tab for our entire selection of rotation mounts and stages.

Quick Links
Product Image (Click to Enlarge)
Item #	MRM05(/M)	RSP05(/M)	CRM05	LRM1	RSP1(/M)	DLM1(/M)	RSP1D(/M)	CLR1(/M)	RSP1X15(/M) RSP1X225(/M)	RSP2(/M)	RSP2D(/M)
Optic Size	Ø1/2"			Ø1"						Ø2"
Internal Threading	SM05 (0.535"-40)			SM1 (1.035"-40)						SM2 (2.035"-40)
Additional Features	-		External SM1 (1.035"-40) Threads		-	Two Independently Rotating Carriages	Adjustable Zero	Rotates Optic Within Fixed Lens Tube System	Continuous 360° or Indexed Rotation	-	Adjustable Zero
Post Mounting	4-40 (M3) Stud	8-32 (M4) Tap	None		8-32 (M4) Tap

Click to Enlarge

Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location	Loose	Optimal	Strict
Internal	1B	2B	3B
External	1A	2A	3A

Metric Thread Tolerance Positions
Location	Loose	Optimal	Strict
Internal	-	G	H
External	e or f	g	h

Metric Thread Tolerance Grades
Dimension	Location	Tolerance Grades^a
Minor Diameter	Internal	4, 5, 6, 7, 8
Major Diameter	External	4, 6, 8
Pitch Diameter	Internal	4, 5, 6, 7, 8
Pitch Diameter	External	3, 4, 5, 6, 7, 8, 9

The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0 UNS-2A		Internal Thread, 0.535"-40.0 UNS-2B
Max Major Diameter	0.5340"	Min Major Diameter	0.5350"
Min Major Diameter	0.5289"	Min Pitch Diameter	0.5188"
Max Pitch Diameter	0.5178"	Max Pitch Diameter	0.5230"
Min Pitch Diameter	0.5146"	Min Minor Diameter (and 83.3% of Thread)	0.508"
Max Minor Diameter	0.5069"	Max Minor Diameter (and 64.9% of Thread)	0.514"

RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0 UNS-2A		Internal Thread, 0.800"-36.0 UNS-2B
Max Major Diameter	0.7989"	Min Major Diameter	0.8000"
Min Major Diameter	0.7934"	Min Pitch Diameter	0.7820"
Max Pitch Diameter	0.7809"	Max Pitch Diameter	0.7866"
Min Pitch Diameter	0.7774"	Min Minor Diameter (and 83.3% of Thread)	0.770"
Max Minor Diameter	0.7688"	Max Minor Diameter (and 64.9% of Thread)	0.777"

C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras
External Thread, 1.000"-32.0 UN-2A		Internal Thread, 1.000"-32.0 UN-2B
Max Major Diameter	0.9989"	Min Major Diameter	1.0000"
Min Major Diameter	0.9929"	Min Pitch Diameter	0.9797"
Max Pitch Diameter	0.9786"	Max Pitch Diameter	0.9846"
Min Pitch Diameter	0.9748"	Min Minor Diameter (and 83.3% of Thread)	0.966"
Max Minor Diameter	0.9651"	Max Minor Diameter (and 64.9% of Thread)	0.974"

SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0 UNS-2A		Internal Thread, 1.035"-40.0 UNS-2B
Max Major Diameter	1.0339"	Min Major Diameter	1.0350"
Min Major Diameter	1.0288"	Min Pitch Diameter	1.0188"
Max Pitch Diameter	1.0177"	Max Pitch Diameter	1.0234"
Min Pitch Diameter	1.0142"	Min Minor Diameter (and 83.3% of Thread)	1.008"
Max Minor Diameter	1.0068"	Max Minor Diameter (and 64.9% of Thread)	1.014"

SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5 x 0.5 – 6H/6g		Internal Thread, M30.5 x 0.5 – 6H/6g
Max Major Diameter	30.480 mm	Min Major Diameter	30.500 mm
Min Major Diameter	30.371 mm	Min Pitch Diameter	30.175 mm
Max Pitch Diameter	30.155 mm	Max Pitch Diameter	30.302 mm
Min Pitch Diameter	30.059 mm	Min Minor Diameter (and 83.3% of Thread)	29.959 mm
Max Minor Diameter	29.938 mm	Max Minor Diameter (and 64.9% of Thread)	30.094 mm

SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40 UNS-2A		Internal Thread, 1.535"-40 UNS-2B
Max Major Diameter	1.5339"	Min Major Diameter	1.535"
Min Major Diameter	1.5288"	Min Pitch Diameter	1.5188"
Max Pitch Diameter	1.5177"	Max Pitch Diameter	1.5236"
Min Pitch Diameter	1.5140"	Min Minor Diameter (and 83.3% of Thread)	1.508"
Max Minor Diameter	1.5068"	Max Minor Diameter (and 64.9% of Thread)	1.514"

SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0 UNS-2A		Internal Thread, 2.035"-40.0 UNS-2B
Max Major Diameter	2.0338"	Min Major Diameter	2.0350"
Min Major Diameter	2.0287"	Min Pitch Diameter	2.0188"
Max Pitch Diameter	2.0176"	Max Pitch Diameter	2.0239"
Min Pitch Diameter	2.0137"	Min Minor Diameter (and 83.3% of Thread)	2.008"
Max Minor Diameter	2.0067"	Max Minor Diameter (and 64.9% of Thread)	2.014"

SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0 UNS-2A		Internal Thread, 3.035"-40.0 UNS-2B
Max Major Diameter	3.0337"	Min Major Diameter	3.0350"
Min Major Diameter	3.0286"	Min Pitch Diameter	3.0188"
Max Pitch Diameter	3.0175"	Max Pitch Diameter	3.0242"
Min Pitch Diameter	3.0133"	Min Minor Diameter (and 83.3% of Thread)	3.008"
Max Minor Diameter	3.0066"	Max Minor Diameter (and 64.9% of Thread)	3.014"

SM4 Threading: Ø4" Lens Tubes
External Thread, 4.035"-40 UNS-2A		Internal Thread, 4.035"-40.0 UNS-2B
Max Major Diameter	4.0337"	Min Major Diameter	4.0350"
Min Major Diameter	4.0286"	Min Pitch Diameter	4.0188"
Max Pitch Diameter	4.0175"	Max Pitch Diameter	4.0245"
Min Pitch Diameter	4.0131"	Min Minor Diameter (and 83.3% of Thread)	4.008"
Max Minor Diameter	4.0066"	Max Minor Diameter (and 64.9% of Thread)	4.014"

Reading a Vernier Scale on a Linear Main Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scales on Thorlabs' rotation, goniometric, or translation mounts). A vernier scale has found common use in many precision measurement instruments, the most common being calipers and micrometers. The vernier scale uses two scales side-by-side: the main scale and the vernier scale. The direct vernier scale has a slightly smaller spacing between its tick marks owing to the vernier scale having N ticks for every N - 1 ticks on the main scale. Hence, the lines on the main scale will not line up with all the lines on the vernier scale. Only one line from the vernier scale will match well with one line of the main scale, and that is the trick to reading a vernier scale.

Figures 1 through 3 show a linear vernier scale system for three different situations. In each case, the scale on the left is the main scale, while the small scale on the right is the vernier scale. When reading a vernier scale, the main scale is used for the gross number, and the vernier scale gives the precision value. In this manner, a standard ruler or micrometer can become a precision instrument.

The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figures 1 - 5) and will indicate the main scale reading. In Figure 1 we see the pointer is lined up directly with the 75.6 line. Notice that the only other vernier scale tick mark that lines up well with the main scale is 10. Since the pointer lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the instrument measures).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement instrument. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a line on the main scale, but instead it is slightly above 75.6 and below 75.7; thus, the gross measurement is 75.6. The first vernier line that coincides with a main scale line is the 5, shown with a blue arrow. The vernier scale gives the final digit of precision; since the 5 is aligned to the main scale, the precision measurement for Figure 2 is 75.65.

Since this vernier scale is 10% smaller than the main scale, moving the vernier scale by 1/10 of the main scale will align the next vernier marking. This asks the obvious question: what if the measurement is within the 1/10 precision of the vernier scale? Figure 3 shows just this. Again, the pointer line is in between 75.6 and 75.7, yielding the gross measurement of 75.6. If we look closely, we see that the vernier scale 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier scale 7 is very slightly above the main scale mark, and we can see that the vernier scale 8 (directly above 7) is slightly below its corresponding main scale mark. Hence, the scale on Figure 3 could be read as 75.673 ± 0.002. A reading error of about 0.002 would be appropriate for
this instrument.

Click to Enlarge
Figure 1: An example of how to read a vernier scale. The red arrow indicates what is known as the pointer. Since the tick mark labeled 10 on the vernier scale aligns with one of the tick marks on the main scale, this vernier scale is reading 75.60 (in whatever units the instrument measures).

Click to Enlarge
Figure 2: The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.

Click to Enlarge
Figure 3: The red arrow indicates the pointer, and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.67 but can be accurately read as
75.673 ± 0.002.

Reading a Vernier Scale on a Rotating Main Scale

The vernier scale may also be used on rotating scales where the main scale and vernier scale do not share units. Figures 4 and 5 show a vernier scale system for two different situations where the main scale is given in degrees and the vernier scale has ticks every 5 arcmin (60 arcmin = 1°). In each case, the scale on the top is the main scale, while the small scale on the bottom is the vernier scale.

In Figure 4 we see the pointer is lined up directly with the 341° line. Notice that the only other vernier scale tick marks that line up well with the main scale are ±60 arcmin. Since the pointer lines up with the main scale at 341°, the reading from Figure 4 is 341.00°.

There are two ways to determine the reading if the zero on the vernier scale line is between two lines of the main scale. For the first method, take the line on the left side of the pointer on the vernier scale and subtract that value (in arcmin) from the value on the main scale that is to the right on the main scale. As an example, in Figure 5 the vernier pointer is between 342° and 343°; using the left blue arrow of the vernier scale results in 343° - 15 arcmin = 342.75°. The second method is to take the reading from the blue arrow on the right side of the vernier pointer and add that value to the lower value from the main scale; reading the right blue arrow in Figure 5 results in 342° + 45 arcmin = 342.75°.

As we've seen here, vernier scales add precision to a standard scale measurement. While it takes a bit of getting used to, with a little practice, reading these scales is fairly straightforward. Vernier scales, whether they are direct or retrograde*, are read in the same fashion.

*A retrograde vernier scale has a larger spacing between its tick marks with N ticks for every N + 1 ticks on the main scale.

Figure 1: Vernier scale measuring 341.00°.

Click to Enlarge
Figure 4: An example of a vernier scale where the main scale and the vernier scale are in different units (degrees and arcmins, respectively). The red arrow indicates the pointer. This scale reads 341.00°.

Figure 2: Vernier scale measuring 342.75°.

Click to Enlarge
Figure 5: The red arrow indicates the pointer and the blue arrows give the precision value from the vernier scale.
This scale reads 342.75°.

Posted Comments:

Kamrul Ome (posted 2024-08-15 16:56:11.59)

Until someone picks up one of these pieces and tries it themselves, it is difficult to understand that the wave plate holders are magnetically attached to the mount. To put a wave plate in there, one needs to use a retainer ring. Moreover, one should clarify whether there is any preferred orientation for the wave plate holders. These aspects can easily be clearly described in a manual, which I believe would make these sorts of devices more popular. The reader may think that these are small details and unimportant, but any competent physicist knows that small details matter at the end of the day. Many people don't get this, but clarity and rigor prevail over everything. Thanks.

cdolbashian (posted 2024-08-26 09:26:13.0)

Thank you for reaching out to us with this inquiry. Much of the information you are searching for can be found directly on the product page in the product description. I have contacted you directly to discuss your inquiries and show you where to find similar types of information in the future.

user (posted 2024-08-15 07:46:11.09)

Since LRM1 has both an internal and an external thread I was wondering if I can combine two of them to mount and rotate two separate waveplates independently from each other? As in mounting each waveplate in one of the mounts, then screwing the two mounts into each other and then still being able to rotate each plate independently? Thanks a lot in advance

cdolbashian (posted 2024-08-26 08:37:55.0)

Thank you for reaching out to us with this inquiry. While this is technically feasible to do, you may run into some difficulties when rotating one with respect to the other, as they are threaded into each other's rotation element. Because of this, you might have some trouble explicitly rotating just one, while holding the other stationary. I have reached out to you with a few alternate part suggestions in order to achieve the result you described.

Aleksej Majkic (posted 2023-01-26 10:26:58.213)

We have a RSP1X15/M rotation mount, which is very tight (it needs considerable torque to rotate it). Is there a recomended procedure to remedy this? Like dismantling&oiling it, or just oiling it? Thank you.

jdelia (posted 2023-02-02 08:55:26.0)

Thank you for contacting Thorlabs. You are welcome to try using some grease/oil to get a smoother rotation, however we do not recommend dismantling the mount. It is also important to make sure that the screw at the top of the mount is disengaged. I have reached out to you directly to troubleshoot this with you and discuss your application further.

user (posted 2022-03-02 02:16:11.153)

It looks like our optic is rotating around a different axis than it's center. Do you have an estimate on the variance of the distance from the rotation axis and the center of the thread? Maybe this particular mount is a outlier, so I would like to know if that is the case and if replacing it would solve the problem.

jdelia (posted 2022-03-11 08:04:33.0)

Thank you for contacting Thorlabs. I have contacted you directly to discuss your application.

user (posted 2021-11-09 12:15:01.383)

Dear madam or sir, are there any items like MRM05 but have a countersunk hole in alignment key or a magnetic base? Thanks!

YLohia (posted 2021-12-23 11:36:39.0)

Thank you for contacting Thorlabs. What are you referring to when you say "alignment key"? Could you please provide a diagram to illustrate exactly what you're looking for? I have reached out to you directly to discuss this further.

Anitta Rose Thomas (posted 2020-01-15 10:59:12.483)

Is there any M4 tapped hole in LRM1.? Looking forward Thanks Anitta

YLohia (posted 2020-01-15 08:42:26.0)

Hello Anitta, thank you for contacting Thorlabs. The LRM1 mount is specifically designed to be mounted to other optic mounts/tubes featuring SM1 threads. You may use the LRM1 along with our LMR1/M to get the ability to mount with an M4 tap. We also offer the RSP1/M, which is similar to the LRM1 but is designed with an M4 tapped hole for mounting.

Markus G (posted 2019-06-11 12:53:18.293)

Is there a specification for tip/tilt of a mounted element during a 360° rotation? I would be especially interested to get specs for the mounts RSP1/M and RSP1X15/M.

YLohia (posted 2019-06-28 02:45:46.0)

Hello, thank you for contacting Thorlabs. Based on our testing, we expect the typical wobble to be the following over a full 360 degree rotation range: RSP1 – 50 µrad RSP1X15 – 300 µrad RSP1X15 (with indexing rotation engaged) - 500 µrad

user (posted 2019-05-07 08:04:24.55)

does not have enough thread to lock into a CCM beamsplitter consistently - instead it goes past the thread and just spins

llamb (posted 2019-05-08 01:14:20.0)

Thank you for your feedback. The LRM1 features the same 3 mm long external SM1 thread as our standard SM1 lens tubes. I see you did not leave contact information, so please reach out to your local Thorlabs Tech Support team (techsupport.uk@thorlabs.com) with further details to clarify what exactly is spinning.

cottsb (posted 2018-11-27 15:43:59.67)

Is it possible to reindex the mount after mounting a polarizer or other optic. That is using a transmission measurement through a mounted optic to find the precise V or H position and reindexing that to zero on the mount?

YLohia (posted 2018-11-28 08:39:00.0)

Unfortunately, the RSP1 cannot be reindexed. To adjust the zero position, we recommend the RSP1D mount.

lrotter (posted 2018-08-08 17:52:58.373)

What is the indexing angle repeatability for RSP1X__?

llamb (posted 2018-08-16 04:49:17.0)

Thank you for contacting Thorlabs. The indexing angle repeatability is at worst ±0.5°, which is the angular tolerance for the v-grooves contained in the indexing ring.

syim (posted 2018-04-12 00:06:27.89)

Could you make "RSP1D/M" without retaining lip? I hope to connect another SM1 threaded mount on the back side. Thank you.

llamb (posted 2018-04-12 08:17:56.0)

Hello, thank you for contacting Thorlabs. We may be able to offer a custom rotation mount without the retaining lip. We will reach out to you directly to discuss a quote and our custom capabilities.

user (posted 2017-11-17 00:49:03.503)

I'd love to buy a simple rotation mount (like RSP05, RSP1, or RSP2) for 1.5 inch optics.

nbayconich (posted 2017-12-18 03:41:31.0)

Thank you for your feedback. We are happy to here suggestions from our customers on how to improve our variety of products. As an alternative solution a Ø1.5" optic can be mounted to a Ø2" rotational mount like RSP2 by using the SM2AD1.5 adapter for Ø1.5" optics. I will reach out to you directly to discuss our custom capabilities. https://www.thorlabs.com/thorproduct.cfm?partnumber=SM2AD1.5

marinaphotonics (posted 2016-08-08 10:41:39.05)

I have 150 3" wedges and need to put them together in pairs. What would it take to get the RSP2D or similar up to 3"

nday (posted 2015-11-16 15:12:35.897)

I'll likely go with a non-indexing version, but I'd love to see a 30mm cage version of the Indexing Rotation Mounts for Ø1" Optics, RSP1X15 and RSP1x225 and their metric versions. (My specific project would use a RSP1X15.) Great equipment, and I really appreciate how responsive Thorlabs is to customer questions. Thank you!

besembeson (posted 2015-11-19 10:09:50.0)

Response from Bweh at Thorlabs USA: Thanks for your kind words and thanks for the suggestion. We will review this and I will follow up with you to know more about your application. For now we only have 30mm cage-system compatible continuous rotation mounts: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1885&pn=CRM1

user (posted 2013-03-27 12:16:01.643)

Do you have a Continuous Rotation Mount for Ø1/2" Optics directly mountable on SM1 thread?

cdaly (posted 2013-04-03 16:12:00.0)

Response from Chris at Thorlabs: Thank you for using our web feedback. No we do not have a rotation mount exactly like this, but the CLR1 can be mounted onto an SM1 thread and a half inch optic rotated continuously within using an adapter like SM1A6(T) or AD1.

olsonaj (posted 2013-03-17 13:54:58.173)

do you have a rotation mount that could accommodate a 30mm diameter waveplate? Perhaps with an adapter of some type?

jlow (posted 2013-03-18 13:35:00.0)

Response from Jeremy at Thorlabs: We do not have a 30mm rotation mount. However, we do have the RSP2 which you can use with a SM2A11 adapter and SM30L05 to mount a Ø30mm optic.

technicalmarketing (posted 2007-08-16 10:41:30.0)

Wave plate and polarizer links have been added to the related items tab. Thank you for the suggestion.

acable (posted 2007-08-15 00:09:19.0)

Waveplates and polarizers are the most used optical elements that require a rotation stage, please consider adding to the "Related Item" tab.

Rotation Mount and Stage Selection Guide

Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, piezo inertia motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.

Manual Rotation Mounts

Rotation Mounts for Ø1/2" Optics
Item #	MRM05(/M)	RSP05(/M)	CRM05	PRM05(/M)^a	SRM05	KS05RS	CT104
Click Photo to Enlarge
Features	Mini Series	Standard	External SM1 (1.035"-40) Threads	Micrometer	16 mm Cage-Compatible	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Compatible with 30 mm Cage Translation Stages and 1/4" Translation Stages^b
Additional Details

This mount is available in the PRM05GL5 bundle, which includes the PRM05 rotation mount with the SM05PM5 polarizing prism mount.
The CT104 is complatible with the 1/4" translation stages using our MS103(/M) adapter plate.
The CT104 is compatible with the CT1A(/M) cage translation stage, which is designed for use with 30 mm cage systems.

Rotation Mounts for Ø1" Optics
Item #	RSP1(/M)	LRM1	RSP1D(/M)	DLM1(/M)	CLR1(/M)	RSP1X15(/M)	RSP1X225(/M)	PRM1(/M)^a
Click Photo to Enlarge
Features	Standard	External SM1 (1.035"-40) Threads	Adjustable Zero	Two Independently Rotating Carriages	Rotates Optic Within Fixed Lens Tube System	Continuous 360° Rotation or 15° Increments	Continuous 360° Rotation or 22.5° Increments	Micrometer
Additional Details

This mount is available in the PRM1GL10 bundle, which includes the PRM1 rotation mount with the SM1PM10 polarizing prism mount.

Rotation Mounts for Ø1" Optics
Item #	LM1-A & LM1-B(/M)	CRM1T(/M)	CRM1LT(/M)	CRM1PT(/M)	KS1RS	K6XS
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Features	Optic Carriage Rotates Within Mounting Ring	30 mm Cage-Compatible^a	30 mm Cage-Compatible for Thick Optics^a	30 mm Cage-Compatible with Micrometer^a	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Six-Axis Kinematic Mount^a
Additional Details

This mount also features four 4-40 (M3) holes on the rotation dial for use with the K6A1(/M) prism platform.

Rotation Mounts for Ø2" Optics
Item #	RSP2(/M)	RSP2D(/M)	PRM2(/M)	LM2-A & LM2-B(/M)	LCRM2A(/M)	KS2RS	K6X2
Click Photo to Enlarge
Features	Standard	Adjustable Zero	Micrometer	Optic Carriage Rotates Within Mounting Ring	60 mm Cage-Compatible	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Six-Axis Kinematic Mount
Additional Details

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous		Coarse: Manual, 360° Continuous; Fine: ±7° Micrometer	Manual, 360° Continuous
Optic Mounting	Internally SM2-Threaded Carriage			Internal SM2 Threads in LM2-A	Internally SM2-Threaded Carriage
Maximum Accepted Optic Thickness	0.51" (13 mm)	0.54" (13.7 mm)	0.48" (12.2 mm)	0.46" (11.7 mm)	0.52" (13.2 mm)	0.47" (12 mm)	0.53" (13.4 mm)
Post Mounting	8-32 (M4) Tap			8-32 (M4) Tap in LM2-B	8-32 (M4) Tap	Four Counterbores for 8-32 (M4) Cap Screws	Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility	N/A		Four 4-40 (M3) Taps on Rotation Dial with 60 mm Spacing	N/A	Four Bores for Ø6 mm Cage Rods with 60 mm Spacing	N/A	N/A

Manual Rotation Stages

Manual Rotation Stages
Item #	RP005(/M)	PR005(/M)	MSRP01(/M)	RP01(/M)	RP03(/M)	QRP02(/M)
Click Photo to Enlarge
Features	Standard					Two Hard Stops
Additional Details

Manual Rotation Stages
Item #	XRNR1(/M)	XRR1(/M)	PR01(/M)	CR1(/M)	XYR1(/M)	OCT-XYR1(/M)
Click Photo to Enlarge
Features	Fine Rotation Adjuster and 2" Wide Dovetail Quick Connect	Fine Rotation Adjuster and 3" Wide Dovetail Quick Connect	Fine Rotation Adjuster and SM1-Threaded Central Aperture	Fine Pitch Worm Gear	Rotation and 1/2" Linear XY Translation
Additional Details

The stage profile is higher when it is mounted using the screw slots rather than stacked on another stage or accessory with mating dovetails.
The OCT-XYR1(/M) stage includes the XYR1A solid sample plate. This plate can be detached from the stage to reveal the same mounting features present on the XYR1(/M) stage.

Motorized Rotation Mounts and Stages

Motorized Rotation Mounts and Stages with Central Clear Apertures
Item #	DDR25(/M)	PDR1C(/M)	PDR1(/M)	PDR1V(/M)	PDXR1(/M)
Click Photo to Enlarge
Features	Compatible with SM05 Lens Tubes, 16 mm Cage System, & 30 mm Cage System	Compatible with 16 mm Cage System	Compatible with SM05 Lens Tubes & 30 mm Cage System	Vacuum-Compatible; Also Compatible with SM05 Lens Tubes & 30 mm Cage System	Compatible with SM05 Lens Tubes & 30 mm Cage System
Additional Details

Motorized Rotation Mounts and Stages with Central Clear Apertures
Item #	K10CR1(/M)	PRM1Z8(/M)^a	DDR100(/M)	ELL14	HDR50(/M)
Click Photo to Enlarge
Features	Compatible with SM1 Lens Tubes & 30 mm Cage System		Compatible with SM1 Lens Tubes, 16 mm Cage System, 30 mm Cage System	Compatible with SM1 Lens Tubes, Open Frame Design for OEM Applications	Compatible with SM2 Lens Tubes
Additional Details

This stage is available in the KPRMTE(/M), which includes the PRMTZ8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.

Motorized Rotation Mounts and Stages with Tapped Platforms
Item #	PRMTZ8(/M)^a	ELL18(/M)^b
Click Photo to Enlarge
Features	Tapped Mounting Platform for Mounting Prisms or Other Optics	Tapped Mounting Platform, Open Frame Design for OEM Applications
Additional Details

This stage is available in the KPRM1E(/M), which includes the PRMT1Z8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
This stage is available in the ELL18K(/M), which includes an interface board, mounting brackets, and connectors for PC control.

Mini-Series Continuous Rotation Mount for Ø1/2" Optics

Mini-Series Continuous Rotation Mount for Ø1/2in Optics

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View Imperial Product List

Item #	Qty	Description
MRM05	1	Mini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, 4-40 Mounting Stud
LPVISE050-A	1	Ø1/2" Linear Polarizer with N-BK7 Windows, 400-700 nm
MS1R	1	Mini-Series Optical Post, Ø6 mm, L = 1"

View Metric Product List

Item #	Qty	Description
MRM05/M	1	Mini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, M3 Mounting Stud
LPVISE050-A	1	Ø1/2" Linear Polarizer with N-BK7 Windows, 400-700 nm
MS1R/M	1	Mini-Series Optical Post, Ø6 mm, L = 25 mm

Linear Polarizer Mounted into the MRM05(/M)

Mount Ø1/2" Optics up to 5.8 mm Thick
Compact Size: 0.81" x 0.78" x 0.44" (20.7 mm x 19.8 mm x 11 mm) [L x W x H]
Internal SM05 (0.535"-40) Threading for Compatiblity with SM05 Lens Tubes
One SM05RR Retaining Ring Included
Post Mountable via 4-40 (M3) Factory-Installed Stud

The MRM05(/M) mount is a lockable, continuous rotation mount for Ø1/2" optics. The mount features full 360° rotation of the mounting carriage, with a marking at every 2° engraved on the circumference of the carriage. The back of the mounting carriage has a knurled edge for easy grip. A setscrew with a 0.05" (1.3 mm) hex is located on top for locking the rotational position. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 5.8 mm thick. Optics are held in the mount with an included SM05RR retaining ring, which can be adjusted with an SPW603, SPW603L, or SPW801 spanner wrench. These mounts are designed to provide a 10 mm optic axis height when measured from the bottom of the mount to match our Mini-Series Kinematic Mounts.

The MRM05(/M) has a 4-40 (M3 x 0.5) mounting stud for post mounting, making this mount compatible with our Mini-Series Optical Post Assemblies. The mounting stud has a length that is optimal for mounting into posts, but can be removed if desired. The mounting hole has a depth of 0.09" (2.3 mm); caution should be taken in choosing a setscrew with the correct length, as damage to the part can occur.

Continuous Rotation Mount for Ø1/2" Optics

Continuous Rotation Mount for Ø1/2in Optics

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Mount Ø1/2" Optics up to 0.23" (5.8 mm) Thick
Compact: 1.00" x 0.87" x 0.45" (25.4 mm x 22.1 mm x 11.4 mm) [L x W x H]
Internal SM05 (0.535"-40) Threading for Compatability with SM05 Lens Tubes
One SM05RR Retaining Ring Included
Post Mountable via 8-32 (M4) Mounting Tap

With a 1.00" (25.4 mm) height and a 0.45" (11.4 mm) thickness, the RSP05(/M) Ø1/2" rotation mount is an ideal solution for compact optical assemblies. The center aperture accepts Ø1/2" optics up to 0.23" thick (5.8 mm), held in place with a SM05RR retaining ring (one included with RSP05). The knurled edge of the RSP05(/M) and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. A convenient top-located setscrew can be tightened with a 1/16" (1.5 mm) hex key or balldriver to secure the rotational position of the mount.

SM1-Threaded Continuous Rotation Mount for Ø1/2" Optics

SM1-Threaded Continuous Rotation Mount for Ø1/2in Optics

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View Imperial Product List

Item #	Qty	Description
CRM05	1	Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, External SM1 Threads
ER3-P4	1	Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L20	1	SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
CP33	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap

View Metric Product List

Item #	Qty	Description
CRM05	1	Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, External SM1 Threads
ER3-P4	1	Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L20	1	SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
CP33/M	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap

CRM05 Mount in a 30 mm Cage System

Mount Ø1/2" Optics up to 0.26" (6.5 mm) Thick
Internal Bore is SM05 (0.535"-40) Threaded for Compatibility with SM05 Lens Tubes
External SM1 (1.035"-40) Threads for Mounting in SM1 Lens Tubes or 30 mm Cage Cubes
One SM05RR Retaining Ring Included

The CRM05 is a lockable, continuous-rotation mount for Ø1/2" optics. The mount features full 360° rotation of the front dial face and a setscrew for locking the rotational position into place. External SM1 threads (1.035"-40) allow the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 0.26" (6.5 mm) thick. Optics are held in the mount with an included SM05RR retaining ring. Two notches along the mount's circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place.

The knurled edge of the CRM05 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount's perimeter, ensuring there is always a witness line in a convenient and easily readable position. The mount can be locked into position using the 0.035" hex setscrew on the outer edge.

SM1-Threaded Continuous Rotation Mount for Ø1" Optics

SM1-Threaded Continuous Rotation Mount for Ø1in Optics<br>

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Item #	Qty	Description
LRM1	1	Rotation Mount for Ø1" (25.4 mm) Optics, External SM1 Threads
LMR1	1	Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
LPNIRE100-B	1	Ø1" Linear Polarizer with N-BK7 Windows, 600-1100 nm
TR2	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"

View Metric Product List

Item #	Qty	Description
LRM1	1	Rotation Mount for Ø1" (25.4 mm) Optics, External SM1 Threads
LMR1/M	1	Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
LPNIRE100-B	1	Ø1" Linear Polarizer with N-BK7 Windows, 600-1100 nm
TR50/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm

A linear polarizer is mounted in the LRM1 continuous rotation mount. This rotation mount can be post mounted by attaching its external SM1 threads to the LMR1(/M) lens mount.

Mount Ø1" Optics up to 0.34" (8.6 mm) Thick
Internal Bore is SM1 (1.035"-40) Threaded for Compatibility with SM1 Lens Tubes
External SM1 Threads for Mounting in SM1 Lens Tubes or 30 mm Cage Cubes
One SM1RR Retaining Ring Included
Not Post Mountable

The LRM1 is a lockable, continuous-rotation mount for Ø1" optics. The mount features full 360° rotation of the front dial face and a setscrew for locking the rotational position into place. External SM1 threads (1.035"-40) allow the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. Please note that the LRM1 will not fit inside our 30 mm cage systems. The center aperture is also SM1-threaded and accepts Ø1" (Ø25.4 mm) optics up to 0.34” (8.6 mm) thick. Optics are held in the mount with an included SM1RR retaining ring. We recommend using a spanner wrench for the SM1RR retaining ring to help secure the optic into place. In addition, two notches along the mount's circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place.

The knurled edge of the LRM1 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount's perimeter, ensuring there is always a witness line in a convenient and easily readable position. The mount can be locked into position using the 8-32 nylon-tipped setscrew on the outer edge. The setscrew can be adjusted using a 5/64" (2.0 mm) hex key or ball driver.

Continuous Rotation Mount for Ø1" Optics

Continuous Rotation Mount for Ø1in Optics

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Mount Ø1" Optics up to 0.47" (11.9 mm) Thick
Compatible with SM1 Lens Tubes
One SM1RR Retaining Ring Included
Post Mountable via an 8-32 (M4) Tapped Hole

The RSP1(/M) Continuous Rotation Mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.47" (11.9 mm) thick. Secure the optic with the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Dual, Continuous Rotation Mount for Ø1" Optics

Dual, Continuous Rotation Mount for Ø1in Optics

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Item #	Qty	Description
DLM1	1	Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, 8-32 Tap
TR1	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1"
CPTS20	1	Cage Plate to Ø1/2" Post Adapter, 20 mm Post Offset, Imperial Thumbscrew
ER2-P4	1	Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
CP08FP	1	FiberPort Adapter for 30 mm Cage System, Enhanced Clamping
PAFA-X-4-A	1	Achromatic FiberPort, FC/PC & FC/APC, f = 4.00 mm, 400 - 700 nm, Ø0.65 mm Waist
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH2E	1	Ø1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=2.19"

View Metric Product List

Item #	Qty	Description
DLM1/M	1	Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, M4 Tap
TR20/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 20 mm
CPTS20/M	1	Cage Plate to Ø1/2" Post Adapter, 20 mm Post Offset, Metric Thumbscrew
ER2-P4	1	Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
CP08FP/M	1	FiberPort Adapter for 30 mm Cage System, Enhanced Clamping, Metric
PAFA-X-4-A	1	Achromatic FiberPort, FC/PC & FC/APC, f = 4.00 mm, 400 - 700 nm, Ø0.65 mm Waist
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH50E/M	1	Ø12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=54.7 mm

Dual Rotation Mount Integrated in a 30 mm Cage System using CPTS20 Adapter

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The rotating optic carriages can be easily removed from the main body of the mount.

Mount Two Ø1" Optics up to 0.25" (6.4 mm) Thick
Each Optic Carriage Rotates Independently
Rotating Optic Carriages are Interchangeable for Quick Swapping
SM1-Threaded Optic Bore in Each Rotating Optic Carriage
Two SM1RR Retaining Rings Included
Post Mountable via 8-32 (M4) Tap

The DLM1(/M) Dual Rotation Mount includes two independently rotating carriages (item # DLM1-A) for Ø1" optics that offer 360° of continuous rotation. The optic bore of each carriage features internal SM1 (1.035"-40) threading and can hold an optic up to 0.25" (6.4 mm) thick with the included SM1RR retaining ring. The carriages magnetically attach to the main body of the mount. To remove a carriage from the mount, simply pull the carriage off the main body. Another carriage can then be snapped on in its place. Extra DLM1-A interchangeable rotating carriages are available to allow optics to be swapped out quickly and easily.

Each carriage has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments for precise, repeatable positioning. Two top-located setscrews can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the optic carriages independently. When the rotation is locked, the double bore on the mount maintains a stable, three-point contact to hold the optic carriage.

The DLM1 mount is designed to put the optic axis 1.00" above the top of the post. The DLM1/M puts the optic axis 25.0 mm above the top of the post. When two optics are mounted, the separation between them is 0.30" (7.6 mm). The dual rotation mount is ideal for creating variable polarizers and attenuators by mounting linear polarizers and wave plates in close proximity without having to align the optic axes of two separate rotation mounts. We do not recommend using this mount with lens tubes, as the torque applied to the optic bore may overcome the magnetic attachment. Optics in SM1-threaded housings can be mounted to the carriage.

Continuous Rotation Mount for Ø1" Optics with Adjustable Zero

Continuous Rotation Mount for Ø1in Optics with Adjustable Zero

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This animation shows the movable scale of the Ø2" RSP2D Mount being rotated to align with the fast axis of a wave plate.

Mount Ø1" Optics up to 0.51" (12.9 mm) Thick
Dial Face Can Be Rotated Independently of Mounted Optics
5 arcmin Vernier Scale
Compatible with SM1 Lens Tubes
One SM1RR Retaining Ring Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP1D(/M) Ø1" Continuous Rotation Mount offers the same features as the RSP1(/M) featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP1 above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.51" (12.9 mm) thick. Secure the optic's position using the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Lens Tube Continuous Rotation Mount for Ø1" Optics

Lens Tube Continuous Rotation Mount for Ø1in Optics

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This animation shows the CLR1 being installed in an SM1 lens tube setup. The wave plate installed in the CLR1 rotates, while the lens tubes remain stationary.

Click to Enlarge
The CLR1 allows an optic to rotate between two fixed SM1 lens tubes.

Holds Ø1" Optics up to 0.50" (12.7 mm) Thick
Ideal for Round Cylindrical Lenses
Rotationally Align Optics Within a Lens Tube System
Post Mountable via 8-32 (M4) Tapped Hole
Features SM1 Quick Release Adapter on Back of Mount

The CLR1(/M) is a rotation mount designed for use with Ø1" round cylindrical lenses and other rotationally sensitive optics within a lens tube system. As round cylindrical lenses only focus or expand light in one dimension, they are not easily aligned within a standard lens mount or lens tube. This rotation mount can be sandwiched between two lens tubes to provide rotation of the mounted optic without disturbing the attached lens tubes.

The back side of this mount utilizes an SM1 (1.035"-40) quick release adapter, which allows the mount to be quickly disconnected and reconnected to a lens tube setup. Please note that this adapter must be removed while inserting an optic in the mount, but once the optic is mounted, the adapter can be reattached. A convenient top-located setscrew can be tightened with a 0.05" (1.3 mm) hex key or balldriver to secure the rotational position of the mount.

Indexing Rotation Mounts for Ø1" Optics

Indexing Rotation Mounts for Ø1in Optics

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This animation shows the movable scale of the RSP1X15 being rotated to align with the fast axis of a wave plate; it also shows the engagement of the indexing mechanism.

Directly Mounts Ø1" Optics up to 0.50" (12.7 mm) Thick
Scale can be Rotated Independently of Mounted Optic for Alignment
Switch Between Continuous and Discrete Rotation
- RSP1X15(/M): Discrete Rotation in 15° Increments
- RSP1X225(/M): Discrete Rotation in 22.5° Increments
5 arcmin Vernier Scale is Ideal for Polarization Optics
One SM1RR Retaining Ring Included
Post Mountable via 8-32 (M4) Tap

The RSP1X15(/M) and RSP1X225(/M) rotation mounts for Ø1" optics feature both continuous 360° rotation and stepped rotation in increments of 15° for the RSP1X15(/M) or 22.5° for the RSP1X225(/M). The top of each mount has a setscrew that, when loosened with a 5/64" (2.0 mm) hex key or balldriver, allows for smooth, continuous, 360° rotation. Tightening the setscrew engages a detent mechanism that forces the mount to rotate in discrete increments. The mounted optic is retained in the central SM1-threaded (1.035"-40) bore using the included SM1RR retaining ring.

In addition, the engraved scale can be unlocked and rotated independently of the optic so that the markings can be aligned with respect to the mounted optic. For example, the zero of the engraved scale can be aligned with the fast axis of a wave plate or the polarization axis of a linear polarizer. To help with the alignment, an engraved arrow extends the zero mark all the way to the outside edge of the SM1-threaded bore used to mount the optic. This animation to the right details the operation of the RSP1X15.

Continuous Rotation Mount for Ø2" Optics

Continuous Rotation Mount for Ø2in Optics

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Mount Ø2" Optics up to 0.51" (13 mm) Thick
Compatible with SM2 Lens Tubes
One SM2RR Retaining Ring Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2(/M) Continuous Rotation Mount utilizes two precision bearings for smooth rotation. The aperture features internal SM2 (2.035"-40) threading and accepts Ø2" optics up to 0.51" (13 mm) thick as well as any SM2-threaded component. Secure the optic using the included SM2RR retaining ring.

The mount has a knurled edge for rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Continuous Rotation Mount for Ø2" Optics with Adjustable Zero

Continuous Rotation Mount for Ø2in Optics with Adjustable Zero

Zoom

This animation shows the movable scale of the RSP2D Mount being rotated to align with the fast axis of a wave plate.

Mount Ø2" Optics up to 0.54" (13.7 mm) Thick
Dial Face can be Rotated Independently of Mounted Optics
5 arcmin Vernier Scale
Compatible with SM2 Lens Tubes
One SM2RR Retaining Ring Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2D(/M) Ø2" Continuous Rotation Mount offers the same features as the RSP2 featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP2(/M) above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM2 threading (2.035"-40) and accepts Ø2" optics up to 0.54" (13.7 mm) thick. Secure the optic's position using the included SM2RR retaining ring. The SM2 threading also provides a means to connect SM2 lens tubes and other Thorlabs components to the mount.

This mount has a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous			Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°	Manual, 360° Continuous
Optic Mounting	Internal SM1 Threads in LM1-A	Internally SM1-Threaded Carriage	Double-Bore with Setscrew	Internally SM1-Threaded Carriage
Accepted Optic Thickness	Max: 0.37" (9.4 mm)	Max: 0.37" (9.4 mm)	Min: 0.31" (7.9 mm)	Max: 0.37" (9.4 mm)	Max: 0.47" (11.9 mm)	Max: 0.55" (14 mm)
Post Mounting	8-32 (M4) Tap in LM1-B	8-32 (M4) Tap			Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility	N/A	Four Bores for ∅6 mm Cage Rods with 30 mm Spacing			N/A

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous
Mounting Platform
Diameter	Ø1.00" (Ø25.4 mm)	Ø1.00" (Ø25.4 mm)	Ø1.40" (Ø35.6 mm)	Ø2.07" (Ø52.8 mm)	Ø4.29" (Ø109.0 mm)	Ø2.00" (Ø50.8 mm)
Height	0.67" (17.0 mm)	0.75" (19.1 mm)	0.51" (13.1 mm)	0.63" (16.1 mm)	0.70" (17.8 mm)	1.00" (25.4 mm)
Taps	Six 4-40 (M3) One 1/4"-20 (M6)	One 8-32 (M4) Eight 4-40 (M3)	Four 4-40 (M3) One 8-32 (M4)	Four 8-32 (M4) One 1/4"-20 (M6)	Eight 6-32 (M4) Sixteen 8-32 (M4) Thirteen 1/4"-20 (M6)	Four 6-32 (M4) Four 8-32 (M4) Five 1/4"-20 (M6)
Additional Holes	Two Ø0.13" (Ø3.2 mm) Holes for FiberBench Accessories	-	Four Clearance Holes for 4-40 (M3) Cap Screws	-	-	-
Platform Adapter Plate(s)	-	-	-	-	-	-
Base
Dimensions	1.50" x 1.50" (38.1 x 38.1 mm)	1.50" x 1.50" (38.1 x 38.1 mm)	1.78" x 1.40" (45.2 x 35.6 mm)	2.45" x 2.45" (62.2 x 62.2 mm)	4.65" x 4.65" (118.1 x 118.1 mm)	2.55" x 2.55" (64.8 x 64.8 mm)
Mounting Holes	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 4-40 (M3) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Counterbores for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	One 4-40 (M3)	One 8-32 (M4)	Three 8-32 (M4)	-
Cage System Compatibility	N/A

Rotation Drive Mechanism and Adjustment Range	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Micrometer, ±5°	Worm Gear, 360° Continuous	Manual, 360° Continuous with 1/2" (13 mm) Linear Travel Along X and Y Axes with Micrometer
Mounting Platform
Diameter	Ø2.21" (Ø56.0 mm)	Ø3.19" (Ø81.0 mm)	Ø2.70" (Ø68.6 mm)	Ø1.70" (Ø43.2 mm)	Ø4.18" (Ø106.0 mm)	Ø4.04" (Ø102.5 mm)
Height	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.0 mm)	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.1 mm)	1.00" (25.3 mm)	1.00" (25.4 mm)	1.00" (25.4 mm)	1.65" (41.8 mm)
Taps	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Four 4-40 (M3) Ten 6-32 (M4) Six 1/4"-20 (M6)	Four 4-40 (M3) Eight 6-32 (M4) Four 8-32 (M4)	Eight 4-40 (M3) Twelve 8-32 (M4) Sixteen 1/4"-20 (M6)	-^b
Additional Holes	-	-	Ø0.94" (Ø23.9 mm) Clear Aperture with SM1 Threading	-	Ø0.90" (Ø22.9 mm) Clear Aperture with SM1 Threading	-^b
Platform Adapter Plate(s)	-	-	PR01A(/M) CRA30(/M)	CR1A(/M)	XYR1A	-^b
Base
Dimensions	3.35" x 2.52" (85.0 mm x 63.9 mm)	4.33" x 3.58" (110.0 mm x 91.0 mm)	2.75" x 3.50" (69.9 x 88.9 mm)	2.76" x 2.10" (70.1 x 53.4 mm)	5.50" x 4.42" (139.7 x 112.3 mm) (Not Including Micrometers)
Mounting Holes	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Two Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	Two 1/4"-20 (M6)	-	-
Cage System Compatibility	-	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System Four 4-40 Taps on Top Surface for 60 mm Cage System Four 4-40 Taps on Bottom Surface for 60 mm Cage System	-^b

Motor Type	Brushless DC Servo	Piezo Inertia Drive
Rotation Adjustment Range	360° Continuous
Rotating Platform/Carriage
Diameter	1.14" (29.0 mm)	1.10" (28.0 mm)	1.34" (34.0 mm)	1.96" (49.7 mm)
Height	1.12" (28.5 mm)	0.71" (18.0 mm)		0.91" (23.0 mm)
Threaded Mounting Holes	Four 4-40 with 16 mm Spacing	Four 8-32 (M4 x 0.7), Four 4-40 with 16 mm Spacing	Four 8-32 (M4 x 0.7)	Four 8-32 (M4 x 0.7), Four 4-40 with 30 mm Spacing Four 2-56 (M2 x 0.4)
Center Aperture	SM05 Internal Threads, 1.2" (28.5 mm) Deep	Ø4.9 mm Clear Aperture with 1/4"-20 (M6 x 1.0) Internal Threads, Thru	Ø9.0 mm Clear Aperture with SM05 Internal Threads, 2.5 mm Deep	Ø9.0 mm Clear Aperture with SM05 Internal Threads, 3.5 mm Deep
Speed (Max)	1800°/s	100°/s	20°/s	30°/s
Base
Dimensions	2.19" x 2.19" (55.6 mm x 55.6 mm)	1.18" x 1.18" (30 mm x 30 mm)	1.57" x 1.57" (40.0 mm x 40.0 mm)	2.20" x 2.20" (56.0 mm x 56.0 mm)
Bottom Surface Mounting Features	-	Two #2 (M2) Slots	Two 8-32 (M4 x 0.7) Holes	Two #8 (M4) Counterbores Two 8-32 (M4 x 0.7) Holes
Side Holes for Vertical Mounting	Four 8-32 (M4 x 0.7) Eight 4-40	Three 8-32 (M4 x 0.7)	One 8-32 (M4 x 0.7), Two Sides	One 8-32 (M4 x 0.7)
Cage System Compatibility	Four 4-40 Holes on Back Side with 16 mm Spacing, Four 4-40 Taps on Front Side with 30 mm Spacing	-	Ø6 mm Holes for ER Cage Rods with 30 mm Spacing	Four 4-40 Taps on Rotating Platform with 30 mm Spacing

Motor Type	2 Phase Stepper Motor with Worm Gear	DC Servo	Brushless DC Servo	Piezo Resonant Motor	2 Phase Stepper Motor with Worm Gear
Rotation Adjustment Range	360° Continuous
Rotating Platform/Carriage
Diameter	1.81" (46.0 mm)	1.97" (50.0 mm)	4.37" (111.0 mm)	-	3.86" (98.0 mm)
Height	0.84" (21.5 mm)	0.91" (23.0 mm)	1.57" (39.9 mm)	0.59" (15.1 mm)	1.73" (44.0 mm)
Threaded Mounting Holes	Six 4-40 (M3)	Four 6-32 (M4), Four 8-32 (M4), Four 4-40 with 30 mm Spacing	Eight 8-32 (M4), Four 1/4"-20 (M6), Four 4-40 with 16 mm Spacing, Four 4-40 with 30 mm Spacing	-	Four 8-32 (M4)
Center Aperture	SM1 Internal Threads, 0.84" (21.5 mm) Deep	SM1 Internal Threads, 0.91" (23.0 mm) Deep	SM1 Internal Threads, 0.82" (21.0 mm) Deep	SM1 Internal Threads, 0.58" (14.7 mm) Deep	Ø50.0 mm Clear Aperture with SM1 Internal Threads, 6.9 mm Deep
Speed (Max)	10°/s	25°/s	1080°/s	430°/s	50°/s
Platform Adapter Plate(s)	K10CR1A2(/M)	PRM1SP1(/M)	NR360SP9(/M) NR360SP4(/M)	-	NR360SP9(/M) NR360SP8 NR360SP4(/M)
Base
Dimensions	4.21" x 2.60" (107.0 mm x 66.0 mm)	5.18" x 3.26" (131.5 mm x 82.8 mm)	4.53" x 4.53" (115 mm x 115 mm)	2.60" x 3.25" (66.0 mm x 82.5 mm)	7.46" x 4.55" (189.4 mm x 115.5 mm)
Stage Adapter Plates	K10CR1A1 K10CR1A3	PRM1SP2 PRM1SP3	-	-	NR360SP2(/M) NR360SP5(/M)
Bottom Surface Mounting Holes	-	Two 1/4" (M6) Counterbores	Four 1/4" (M6) Clearance Holes	-	Four 1/4" (M6) Counterbores
Side Holes for Vertical Mounting	Three 8-32 (M4)	Four 8-32 (M4)	Eight 1/4"-20 (M6)	-	Six 1/4"-20 (M6)
Cage System Compatibility	Four 4-40 Holes on Each Side with 30 mm Spacing	-	Four 4-40 Holes on Back Side with 30 mm Spacing	60 mm Cage using Four Ø0.12" (3.0 mm) Holes for 4-40 Screws, 30 mm Cage using SR025 Cage Rods to Adapt to ER Cage Rods	-

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous					Manual, Continuous: 360°; Discrete: 15°	Manual, Continuous: 360°; Discrete: 22.5°	Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°
Optic Mounting	Internally SM1-Threaded Carriage
Maximum Accepted Optic Thickness	0.47" (11.9 mm)	0.34" (8.6 mm)	0.51" (12.9 mm)	0.25" (6.4 mm)	0.27" (6.8 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)
Post Mounting	8-32 (M4) Tap	N/A	8-32 (M4) Tap
Cage System Compatibility	N/A							Four 4-40 (M3) Taps on Rotation Dial with 30 mm Spacing