Shear-Loc Products is the original developer and manufacturer of the instant thumbscrew. The Shear-Loc design makes it much more than merely a press fit assembly.  It’s a cold-forming process that creates a permanent junction between the socket head cap screw and the knob. The strength of this connection is enough to withstand nearly every hand strength application. 

Shear-Loc Products was awarded two individual patents with 13 claims for this functional design. We have the most experience incorporating cold-forming techniques, allowing our products to overcome the varying tolerances present in every socket head cap screw.

This knowledge and our dedication to quality is what creates the value Shear-Loc instant thumbscrews have been known for over 50 years.