SM05-Compatible Rotation Mounts


SM05-Compatible Rotation Mounts

  • 0.535"-40 Threading
  • Mount SM05 Lens Tubes
  • Mount Ø1/2" (Ø12.7mm) Optics


  • SM05 (0.535"-40) Series Threaded
  • Mount Ø1/2" (12.7 mm) Optics
  • 360° Continuous Rotation of Optic
  • Engraved Scale and Set Screw to Lock Position

Thorlabs introducted the SM Series Threading standards to ensure compatibility over a broad range of product lines. SM Series Threaded components offer a simple and efficient solution for building optomechanical structures. The SM Threaded products available, including lens tubes and cage system components, fixed and kinematic mounts, irises and diaphragms, provide flexibility when constructing complex optical systems.

SM05 Threaded (0.535"-40) components are designed to mount or integrate Ø1/2" (12.7 mm) lens into optical systems. These SM05 threaded rotation mounts allow for the 360° degree rotation positioning of the optic; these mounts feature engraved scales and set screws to lock the optic's position.


Continuous Rotation Mount for Ø1/2" Optics

* Mount Ø1/2" Optics up to 0.23" (5.8 mm) Thick
* Compact 1" (25.4 mm) H x 0.87" (22 mm) W x 0.45" (11.4 mm) Thick
* Compatible with our SM05-Threaded Lens Tubes
* One SM05RR Retaining Ring Included
* Post Mountable via 8-32 (M4) Mounting Tap

With an overall size of 1" tall by 0.45" thick, the RSP05 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 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. A convenient top-located setscrew secures the rotational position of the stage.


High-Precision Rotation Mount for Ø1/2" Optics

  • Accepts Ø1/2" (Ø12.7 mm) Optics up to 0.23" (5.9 mm) Thick
  • 360° Continuous Coarse Rotation
  • Direct Read 2° Graduations Engraved on the Edge of the Rotation Dial
  • ±7° of Fine Adjuster-Driven Rotation when Locked
  • Vernier Scale with 10 arcmin Resolution
  • Ideal for Ø1/2" Polarization Optics
  • Compatible with our SM05 Lens Tubes
  • One Retaining Ring (SM05RR) Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM05(/M) high-precision rotation mount for Ø1/2" optics combines 360° of continuous coarse manual rotation with precise, backlash-free adjustment. The SM05 (0.535"-40) threaded inner bore accepts Ø1/2" optics up to 0.23" (5.9 mm) thick as well as any of our SM05-threaded components. Optics are secured between the rear lip and one SM05RR retaining ring, which is included with each mount.

The edge of the rotation dial features a laser-engraved scale marked at 2° increments and can be coarsely rotated manually using the knurled ring located on the rear of the mount (see drawing to the right). The 4-40 setscrew, which is inset into the side of the body of the mount, locks the dial face and engages the adjuster screw for fine rotation. When locked, the adjuster provides ±7° of rotation.

The PRM05(/M) is ideal for mounting our SM05PM5 polarizing prism mount, which features compatible SM05 threading. The cover on the SM05PM5 can be rotated, thereby allowing the user to block the two side ports when they are not required. The PRM05(/M) can be purchased bundled with our SM05PM5 (Item# PRM05GL5(/M) below). Together, they provide 360° of high precision rotation for either our 5 mm Glan-Laser or Glan-Taylor Polarizer.


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


  • Mount Ø1/2" Optics up to 0.26" (6.5 mm) Thick
  • Compatible with SM05 Lens Tubes
  • One SM05RR Retaining Ring Included
  • Mountable via External SM1 Threads

The CRM05 Ø1/2" Rotation Mount is designed with an external SM1 thread (Ø1.035"-40), allowing 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 (Ø0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 0.26" (6.5 mm) thick. Optics are held in the mount with a SM05RR retaining ring (one included). 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. Tighten the 2-56 setscrew to lock the mount into position, preventing further rotation.


Ø1/2" Rotation Mount for 16 mm Cage System

* 360° Continuously Rotatable
* 2° Graduations on Dial
* Nylon Tipped Locking Screw
* Accepts Ø1/2" (Ø12.7 mm) Optics up to 0.24" (6.1 mm) Thick

The SRM05 continuously rotatable optic mounts are designed to work with our 16 mm cage systems. The SRM05 is ideal for mounting Ø0.5" optics up to 0.24" (6 mm) thick in a 16 mm cage system. For thicker optics, any SM05 Series lens tube can be threaded into the carriage. One SM05RR retaining ring is included; additional rings are available for purchase.


Ø1/2" Rotation Mount

* Coarse Rotation: 360° Continuously Adjustable
* Graduations: 2° Increments
* Mount Ø1/2" (Ø12.7 mm) Optics up to 0.29" (7.4 mm) Thick
* Runout: <0.0001" Along Optical Axis
* Max. Clear Aperture: 0.43"
* Lockable Design

The CT104 has an internal SM05 threading for mounting Ø1/2" (Ø12.7 mm) optics and externally threaded SM05 threaded components. The CT104 mount provides 360° of continuous rotation for the mounted components. The 2° graduation allows for precise positioning of components such as linear polarizers and waveplates. A top-mounted, nylon-tipped setscrew is used to lock the position of the component. The mount is compatible with the MS103 adapter plate and with the CT1 30 mm cage Z-axis translation stage. One SM05RR retaining ring, which secures a component by sandwiching it between the ring and the back lip on the mount, and two 4-40 cap screws for securing the mount, are included with each unit.


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