The flexloc nut is the classic self-locking prevailing torque nut. Its one piece, all metal construction stands up under extreme temperatures, vibration and shock. As they don't have a nylon insert, it consistently provides better tensile strength than the leading two-element locknuts and is ideal for elevated temperature environments. The real secret of the flexloc design is the slotted locking feature. As the bolt engages the locking feature, the slotted section expands, initiating the locking action. This expansion lifts the nut upward, causing the threads to bear against the lower surface of the bolt threads. Once fully engaged each flexloc thread provides a load-carrying capacity resulting in a lower more uniform distribution of stress per thread. This locking feature and the flexloc locknut's all-metal construction combine to create superior vibration resistance. Its full height locknut provides up to 19% more tensile strength than nylon insert locknuts and as much as 26% more strength than a competitive all-metal locknut of equal size. The thin height locknut provides virtually twice as much tensile strength as nylon insert locknuts.