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Spiralock® is a unique and proprietary preload locking internal (female) thread form that's exceptionally resistant to transverse vibration—the primary cause of thread loosening.
Proven in thousands of applications, Spiralock threaded holes and nuts accept standard male fasteners, eliminate the need for other locking devices, and substantially reduce the potential for fatigue failure when compared to standard threads.
Started as a tooling shop in 1927, the company introduced the Spiralock thread design in 1979 to solve vibration loosening issues.
Spiralock is AS/EN/JISQ9100 — Revision C and ISO 9001:2008 certified.