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SM1-Compatible Manual Rotation Mounts
Internal SM05 Threads,
Rotation Mount for Ø1" Optics and Two SM1 Lens Tubes
High-Precision Rotation Mount for Ø1" Optics
Cage System Rotation Mount for Ø1" Optics
High-Precision Rotation Platform
Internal and External SM1 Threads
Ø1" Kinematic Rotation Mount
This page has a compilation of rotation mounts that feature internal or external SM1 (1.035"-40) threads and can mount Ø1/2" (Ø12.7 mm) optics, Ø1" (Ø25.4 mm) optics, or SM1-threaded components. Each mount allows for 360° rotation of an optic, SM1-threaded component, or platform.
Thorlabs introduced the SM Thread Standards to ensure compatibility over a broad range of product lines. SM-threaded components offer a simple and efficient solution for building optomechanical structures. Our SM-threaded products, including lens tubes and cage system components, fixed and kinematic mounts, irises and diaphragms, provide flexibility when constructing complex optical systems. Please see the Threading Specs tab for more information on Thorlabs' SM thread standards.
Thorlabs also has similar compilations of SM-threaded rotation mounts for Ø1/2" (Ø12.7 mm) and Ø2" (Ø50.8 mm) optics. For our entire selection of rotation mounts, please see the Rotation Mounts and Stages tab.
Thorlabs' Threading Specifications
Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
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
Manual Rotation Stages
Motorized Rotation Mounts and Stages
The PRM1(/M) high-precision rotation mount for Ø1" optics combines 360° of continuous manual rotation with precise, backlash-free micrometer adjustment. The SM1 (1.035"-40) threaded inner bore accepts Ø1" optics up to 0.50" (12.7 mm) thick as well as any of our SM1-threaded components. Optics are secured with one SM1RR retaining ring, which is included with each mount.
The rotation dial face features a laser-engraved scale marked at 1° increments and can be rotated manually using the knurled outer surface (see drawing to the right). The thumbscrew, located on the lower right side of the mount, locks the dial face and engages the micrometer for fine adjustment. When locked, the micrometer provides ±7° of rotation at approximately 2.4 arcmin per micrometer division.
The PRM1(/M) is ideal for mounting either our SM1PM10 or SM1PM15 Polarizing Prism Mounts, both of which feature compatible SM1 threading. It can be purchased bundled with our SM1PM10 [Item# PRM1GL10 (PRM1GL10/M)]. Together they provide 360° of high precision rotation for either our 10 mm Glan-Laser or Glan-Taylor Polarizer (sold separately).
The PRM1(/M) is also compatible with our 30 mm cage system. The cage system can be mounted to the unit using ER cage assembly rods attached to the four 4-40 tapped holes located on the rotation dial face (there are no 4-40 tapped holes on the back of the mount). When using this product the entire 30 mm cage system will be rotated, not just the optic. Pairing this with our CPU1 Rotating Cage Plate will allow for a rotating cage segment between the PRM1 and a fixed cage system.
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.
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The rotating optic carriages can be easily removed from the main body of the mount.
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.
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.
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.
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.
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.
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.
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The optic carriage is locked in place by a thumbscrew and can be easily removed from the main body of the mount.
The LM1-A optic carriage can be nested inside of the LM1-B (LM1-B/M) mounting ring and offers 360° of continuous rotation for Ø1" optics. The optic bore of the LM1-A carriage features internal SM1 (1.035"-40) threading and can hold an optic up to 0.37" (9.4 mm) thick with the included SM1RR retaining ring or an optic in an SM1-threaded housing. The carriage attaches to the main body of the mount using a thumbscrew. To remove the carriage from the mount, simply loosen the thumbscrew. Extra LM1-A interchangeable rotating carriages are available to allow optics to be swapped out quickly and easily.
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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.
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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.
The CRM1 (CRM1/M) is designed to mount Ø1" (Ø25 mm) optics up to 10 mm thick in an SM1 threaded rotation carriage. The optic is secured using the included SM1RR retaining ring (the SPW602 spanner wrench is ideal for tightening this retaining ring). For thicker optics, any of our SM1 series of lens tubes can be threaded into the carriage or the CRM1L can be used instead. The smooth rotation mechanism allows for precise positioning of the rotation carriage. The CRM1(/M) is designed to be mounted in a 30 mm cage structure.
This animation shows the manual rotation and micrometer engagement of the CRM1P.
The CRM1P(/M) is designed to mount Ø1" (Ø25.4 mm) optics up to 9.4 mm thick in an SM1 threaded rotation carriage. The optic is secured using the included SM1RR retaining ring (the SPW602 spanner wrench is ideal for tightening this retaining ring). For thicker optics, any of our SM1 series of lens tubes can be threaded into the carriage. The smooth rotation mechanism on the CRM1P(/M) can be manually rotated to any position. When the rotation carriage is locked, the high-precision, backlash-free micrometer can then be used to fine tune the position of the rotation carriage over a range ±7°. The animation to the right illustrates how the CRM1P(/M) is used. The Vernier scale provides a resolution of 5 arcmin between consecutive marks. As the mount is rotated across the entire Vernier scale, there is a cumulative error of up to ±12.28 arcmin. The CRM1P(/M) is compatible with the 30 mm cage system and the 8-32 (M4) tapped mounting hole allows the rotation mount to be secured on a TR series post.
This mount is also mechanically compatible with Ø25.0 mm optics, but we only recommend this for applications in which the centration of the optics is not critical.
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The LCP16R1 rotation mount in a 60 mm cage system with the CS2100M-USB Quantalux® camera and the LCP4S cage plate adapter.
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This mount offers 360° of coarse rotation via the rotation ring and ±8° of fine rotation via the threaded adjuster. The coarse and fine rotation are independent of each other and both positions can be locked using the respective 5/64" (2 mm) hex locking screws.
The LCP16R1 mount includes an LCP16RP1 SM1-threaded rotation ring that can be removed (left) and replaced with an LCP16RP2 SM2-threaded rotation ring (right).
Thorlabs' LCP16R1(/M) 60 mm Cage System Rotation Mount with SM1 Threads provides ±8° of fine and 360° of coarse rotation angle adjustment for SM1-threaded components integrated with a 60 mm cage system. A nylon-tipped setscrew secures the included LCP16RP1 rotation ring; this setscrew can be loosened using a 5/64" (2 mm) hex key to allow for 360° of manual rotation (see the image to the right). Once this screw is tightened, fine rotation adjustment is achieved via a 3/16"-100 threaded adjuster. A fine adjustment scale engraved on the top of the mount has graduations every 1° with a range of ±8°.
This mount features four through holes for ER cage rods that are compatible with Thorlabs' 60 mm cage system or cameras that use this hole pattern, such as our scientific CCD cameras. The removable rotation ring on the front of the mount has 0.40" (10.1 mm) deep internal SM1 (1.035"-40) threads, allowing Ø1" (Ø25.4 mm) optics, Ø1" lens tubes, or other externally SM1-threaded components to be integrated with the rotation mount. Internally C-mount threaded components, such as Thorlabs' USB C-Mount CCD, Quantalux® sCMOS, or Kiralux™ CMOS cameras, can be attached to the rotation ring using an SM1A39 adapter; alternatively, the SM1T2 coupler can be used to connect internally SM1-threaded components, such as Zelux™ CMOS cameras or a selection of our microscope port adapters. Note that the back of the SM1-threaded bore has a retaining lip, so SM1-threaded components can only be mated to the front side.
Users can switch out the included SM1-threaded LCP16RP1 rotation ring with the SM2-threaded LCP16RP2 rotation ring to integrate SM2-threaded components into the LCP16R1(/M) mount; see the image to the right. We also offer the LCP16RP1 rotation ring separately in case a replacement is needed. To switch the rotation ring in a mount, loosen the side-located setscrew using a 5/64" (2 mm) hex key and replace the rotation ring with the desired one.
We also have available an SM2-threaded 60 mm cage system rotation mount.
The KS1RS is designed to hold Ø1" (25.4 mm) optics in situations where it is necessary to control the tip/tilt position as well as the rotation of the optic. This mount is ideal for polarization optics such as linear polarizers or wave plates. In addition, our Ø1" round cylindrical lenses may also be mounted in the KS1RS when it is necessary to adjust the angle of the line produced at the focal plane. The KS1RS features an SM1-threaded bore capable of mounting Ø1" optics up to 0.47" (11.9 mm) thick using the included SM1RR retaining ring. Additionally, SM1 lens tubes may be threaded onto the mount to accommodate thicker optics.
Thorlabs' Kinematic Rotation Mounts combine the features of our Precision Kinematic Mirror Mounts and Manual Rotation Mounts, providing continuous 360° rotational adjustment and ±4° kinematic tip/tilt adjustment. These mounts are therefore ideal for holding optics with rotational
The rotation of the mount may be locked in position with a locking screw. The locking screw is activated using a 5/64" (2 mm) hex key. The kinematic adjustment is provided by three 1/4"-80 adjusters with brass bushings to provide smooth adjustment. Each adjuster may be locked with a locking screw using a 5/64" (2 mm) hex key.
Please note that while this mount is designed to hold Ø1" optics, the mount uses the same form factor as the KS2 Ø2" mirror mount in order to incorporate the rotation ring.
K6XS 6-Axis Kinematic Mount Usage
The K6XS 6-Axis Kinematic Optic Mount is designed as a general-purpose, high-precision positioner. The optic cell can be translated along 6 axes, and each axis has a locking screw for stability. The translating cell has SM1 (1.035"-40) threading for attaching Ø1" lens tubes or mounting Ø1" (25 mm) optics up to 0.55" (14 mm) thick using the included SM1RR Retaining Ring, which can be tightened using an SPW602 or SPW606 Spanner Wrench (sold separately). The rotating dial has tapped 4-40 holes for attaching the K6A1 (sold separately below).
In testing, the K6XS was shown to drift less than 15 µrad in 48 hours at typical environmental conditions, with a 2 °C temperature fluctuation. The X and Y axes cause less than ±10 µm of crosstalk when translated over their full range.
The PR01(/M) Rotation Mount provides 360° of coarse rotation
and ±5° of fine rotation.
The PR01(/M) Precision Rotation Platform combines easy-to-use manual rotation with high-precision, backlash-free micrometer adjustment. As shown in the animation to the right, while the platform dial is in an unlocked state, continuous smooth rotation can be measured using the 1º graduation marks. When locked via the steel thumbscrew (visible in the image to the above left), the dial is adjusted by a ±5º micrometer drive system, offering 5 arcmin resolution from the side vernier. The PR01(/M) has a load capacity of 25 pounds.
The SM1 (1.035"-40) tapped hole provides a Ø0.94" (24 mm) clear aperture at the base and 0.75" (19 mm) of usable thread. An array of 1/4"-20 (M6), #6-32 (M4), and #4-40 tapped holes offer a range of mounting options. While the 1/4"-20 (M6) tapped holes are for general purpose mounting, the #6-32 (M4) tapped holes provide compatibility with our PM1/PM2 series of clamping arms for applications including prism mounting. The #4-40 tapped holes are spaced for direct compatibility with our 30 mm Cage System rod spacing.
For optomechanical applications requiring a solid center rather than the SM1 tapped hole, the PR01A adapter plate is available.
Four 1/4" (M6) clearance slots are spaced for direct fastening to an optical table. An additional 1/4"-20 (M6) tapped hole on the edge opposite the micrometer drive allows for vertical mounting.
The XYR1(/M) is a low-profile XY axis translation stage with continuous rotation about the Z axis. The central SM1-threaded (1.035"-40) through hole allows the stage to be used in an imaging application that requires illumination from underneath the sample. The OCT-XYR1(/M), used with our OCT Systems, features a removable top plate that is secured through the SM1-threaded through hole. Removing the top plate provides access to the same tapped holes available with the XYR1 stage. The XYR1A Solid Sample Plate can be purchased separately to add a flat surface to an XYR1(/M) stage.
These stages contain an array of 1/4"-20 (M6) and 8-32 (M4) tapped holes for mounting samples and components. In addition, the top of the stages have eight 4-40 tapped holes around the central through hole so that it can be used with Thorlabs' 30 mm or 60 mm cage system without the use of adapters. There are also four 4-40 tapped holes on the bottom for use with 60 mm cage components.
The X and Y axis micrometers on the translation stages have a travel range of 1/2" (13 mm). An engraved angular scale along the outer edge of the stage's mounting surface allows the user to set the angular orientation of the stage, which can then be fixed using a locking setscrew. Locking the rotation axis does not prevent translation along the X and Y axes. To prevent attached components from interfering with the stage’s rotation or translation, the top surface of the rotation platform is above the frame of the XYR1(/M).
These stages are also compatible with Microscope Slide Spring Clips. They have 3 alignment holes for the Ø1/8" × 1/4" dowel pins (included with the SLH1). These dowel pins center the middle of a 1" × 3" microscope slide over the through hole, as well as allow the user to repeatedly and accurately position the slides on the stage. The spring clips include two 8-32 (M4) threaded shoulder screws with a 3/32" (2.5 mm) hex socket for simple attachment to the stage.