Self-Locking Fastener Suited for Orthopedic Implants

A self-locking threaded fastener is suited for use in medical devices, such as orthopedic implants, that may have to stay in place for as many as one million lifetime load cycles. The fastener is designed to withstand loosening from the effects of repetitive loading, vibration, and shock. It is also engineered to resist stripping and shearing of the threads, even when the load is strong enough to break the fastener. A 30° wedge ramp cut at the root of the female thread distinguishes this fastener from traditional fasteners, which have a 60° thread. Under clamp load, the crests of the threads on any standard male bolt are drawn tightly against the wedge ramp to eliminate sideways motion and distribute the threaded joint’s load among all of the engaged threads.

Spiralock
Madison Heights, MI, 800/521-2688