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A CF125 fork is used to secure a Ø1/2" post holder to an optical table with a BE1 base.

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These base adapters feature a 1/8" (3 mm) hex socket on the bottom for tightening.

• Converts Standard Ø1/2" Post Holders and Ø1" Post Extensions into Pedestal-Style Mounts
• 1/8" (3 mm) Hex Socket on Bottom for Tightening
• Machined Bottom Relief Cut for Added Stability
• CF Series Clamping Fork or  Table Clamp Secure Base to a Breadboard or Table
• Each Pack Includes 5 Base Adapters

The BE1(/M) pedestal base adapter features 1/4"-20 (M6)-threaded studs that fit into the bottom of our standard Ø1/2" post holders or Ø1" post extensions (see photos to the right), converting them into pedestal-style mounts for added stability. Made from solid 303 stainless steel with a 1.25" (31.8 mm) outer diameter, these adapters allow Ø1/2" post holders and Ø1" pillar posts to be used with the CF series of clamping forks, and can be tightened onto the post or post holder using a 1/8" (3 mm) hex.

Alternatively, Thorlabs offers pedestal pillar posts that do not require a BE1(/M) base adapter. We also offer the () magnetic base adapters (sold individually), which provide additional stability during alignment for temporary setups.

To order an base adapter, or for more options, please see our base adapters page.