• Mount Ø25.4 mm Optics up To 12.8 mm Thick
• Compatible with SM1 Lens Tubes
• One SM1RR Retaining Ring Included
• Post Mountable via an M4 Tapped Hole
• Unpackaged Weight: 83.7 g

Our Ø25.4 mm RSP1C/M rotation mounts utilize two precision bearings for smooth, backlash-free rotation. The apertures are threaded with our internal SM1 threading to accept Ø25.4 mm optics. One SM1RR threaded retaining ring is included with each mount, which is used to hold an optic up to 12.8 mm thick. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

Both mounts feature a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. For calibration purposes, the scale on the RSP1C/M can be unlocked and rotated so that it can be aligned to the axis of an optic (i.e., fast axis of a waveplate). A top-located setscrew can be tightened to lock the rotation of the mount.