Stanley Engineered Fastening now incorporates its highly effective, self-locking Spiralock internal thread form design – which has superior resistance against self-loosening when exposed to harsh environments involving significant shock, extreme vibration, and drastic thermal cycling – into key locking threaded inserts. When designing components and threaded assemblies, the solid body key inserts are often considered as the most durable and robust threaded insert option; the key inserts provide the strongest thread reliability and load carrying capacity in many materials. When compared to a tapped hole or other threaded inserts, the key inserts will have the highest pull out strengths in all materials due to the staking of the keys and tubular insert body design.(…)
via Spiralock Self-Locking Key Inserts Offered for Vibration, Shock, & Thermal Cyclical Environments.