Collar Type Prevailing-Torque Locknut

The C-LOC Collar Type locknut employs an oval locking collar on top of the nut to create frictional thread interference during installation. These locknuts are available in American Standard and Metric; hex-finished, jam, heavy, and hi nuts.

For special applications, C-LOCs are available in special light or heavy torque versions, and specials can be manufactured to print.


Steel Grade 2-5-8, 2H/DH, Monel, brass, bronze, aluminum alloys, and stainless steel


UNC, UNF or 8UN Series, Class 2B, 3B, left-hand thread, and Metric


Plain, zinc, cadmium, mechanically galvanized, and other platings and coatings