Locknuts with modified threads enable simplified tightening of mating screws

New PEM® S-RT™ self-clinching, free-running locknuts from PennEngineering® feature a modified thread angle, enabling simplified tightening of mating screws and vibration-resistant locking performance in thin metal assemblies.

The modified thread formation allows mating screws to spin freely during the attachment process until clamp load is induced during the screw-tightening process. The applied clamp load then engages the locknut’s vibration-resistant locking feature, which locks the screw in place. Joint clamp load remains consistent, even after many on/off cycles.

The self-clinching locknuts install into aluminum or steel sheets as thin as 0.030 in. and become permanent parts of an assembly. After locknut installation using a PEMSERTER® or other standard press, the back side of the host metal sheet for screw insertion will be flush or subflush, and the assembly side will be flush or subflush for sheet-to-sheet attachment applications.