Thorlabs KGM40 Kinematic Grating Mount Adapter

The Thorlabs KGM40 is a Kinematic Grating Mount Adapter designed for mounting rectangular optics or gratings within Ø1″ (25.4 mm) mirror mounts — particularly Thorlabs’ POLARIS‑K1E and other front-loading, unthreaded mirror mounts.

⚙️ Key Features

• Compatibility: Works with all Ø1″ mirror mounts (front‑loading, unthreaded types) according to Thorlabs’ standard interface.

• Grating Size Range: Specifically designed for optic heights between 20 mm and 40 mm; for optics exactly 20 mm tall, the KGM40 is the correct model.

• Clamping Mechanism: Uses a spring‑loaded 3‑point kinematic mount (two lower contact lines and a top flat spring), along with adjustable clamps and a nylon‑tipped locking setscrew for secure positioning.

• Thickness Accommodation: Accepts gratings or mirrors with thicknesses from roughly 5 mm to 10 mm.