Pem® S-RT® – free-running locknut

This PEM fastener has a specially designed self-locking thread, in which the connecting screw can be driven through with free hand operation and without resistance during installation. When the screw is tightened, the thread design creates a self-locking effect, which protects the joint against loosening. Even after the screw is loosened, it can be screwed in the nut with free hand and can be tightened/loosened again. Self-locking is achieved each time the bolt is tightened.

In terms of size, it is available in threads from M3 to M8. Type S-RT is made of zinc plated hardened carbon steel and can be pressed into plate up to HRB 80 (HB 150) hardness.


  • hardened carbon steel, zinc plated
  • running-thru self-locking thread
  • M3-M4-M5-M6-M8 thread sizes
  • min.0,8mm sheet thickness depending on size
  • max. HRB 80 / HB 150 sheet hardness

Typical applications:

  • sheet metal industry

Further details of​​​​​ Pem® S-RT® self-clinching locknut with free-running thread are available to download in PDF from our website.