Optical Post Holder, Pedestal Base, 4.19 in. Height, 0.5 in. Posts

The VPH-4-P Pedestal Base Post Holder has a spring-loaded brake shoe design which applies a constant force to 1/2 in. diameter optical posts even when the thumbscrew is loosened. This allows the orientation of an optical mount to be easily adjusted with one hand. This post holder supports a minimum height of 4.0 in. and includes a stainless steel pedestal base adapter already attached for mounting to optical tables with a fork clamp. The base adds 0.188 in. to the standard height of each post.

Brake-shoe Design Offers Grip for Easy Adjusting

VPH Series optical post holders feature a unique, spring-loaded, brake shoe design to apply constant friction to optical posts during height adjustments for no-slip operation, before locking in place with its thumbscrew. Unlike typical spring-loaded post holders, the VPH Series holds posts in place even if the thumbscrew is partially or completely loosened. Moreover, the VPH Series' holding force is greater than typical spring-loaded screws. The result is easier, faster, and more reliable alignment of an optical experiment.

Two-Line Contact for Greater Stability

By using precision machining techniques to remove a small portion of the interior surface opposite the set screw of our VPH Series optical post holder, two lines of contact are created with a post when it is pushed in by the screw. These two lines of contact provide greater stability compared to a post held in place against another circular surface.

Versatile Mounting

Standard VPH post holders feature a 1/4-20 (M6) threaded hole at the bottom and therefore can be threaded directly into an optical table, or with a pedestal base adapter or slotted base (aluminum slotted base or stainless steel slotted base), be mounted anywhere on the optical table.