Compare Model Drawings, CAD & Specs Optic Diameter Thread Type Availability Price
Rotary Mount, 1 inch Waveplates or Polarizers, 8-32 Thread
In Stock
25.4 mm 8-32
In Stock
Rotary Mount, 1 inch Waveplates or Polarizers, M4 Thread
In Stock
25.4 mm M4
In Stock


  • Optic Diameter
    25.4 mm
  • Angular Range
    360 °
  • Material
  • Drive Type
  • Retaining Ring Thread
  • Thread Type
    8-32 or M4 (-M version)


Stack Mounts for a Continuously Variable Attenuator

By combining two 1-inch rotary stages (using two 1/4-20 (M6) cap screws with nuts), you can make a continuously variable attenuator that works with any linearly polarized light while maintaining the original input-polarization state. The rotation stages mount together, so you only need the space for one component on your table. If you have randomly polarized light, you can use two polarizers to make a variable attenuator.

Best for Simple Rotation of 1 in. Optics

The 9401 Rotary Mount smoothly rotates 1.0 inch diameter wave plates or polarizers held in place with a retaining ring. This patented rotary stage gives fluid rotation around 360° with 0.1° resolution, measured easily with its vernier scale. Rotation is controlled with a lever that provides both coarse and fine adjustments, as well as making this economical mount ideal for use in polarization-based attenuating system. The lever arm is removable to prevent accidental movement once aligned.

Vertical and Horizontal Mounting

The 9401 Series Rotation Mounts can be supported by an optical post in a vertical configuration using the 8-32 (M4) tapped hole at the bottom. They also feature an 8-32 (M4) counterbored hole in the middle of the mount's base and can be mounted horizontally.