Nylon Insert Locknuts grip male threads to resist loosening caused by vibration or torque. They are reusable however their effectiveness is reduced after each use. Maximum service temperature is 250° F.
Grade C “All Metal” Locknuts are designed to be used with threaded fasteners with strengths up to SAE J429 Grade 8. The top of the nut is oval shaped which provides a locking force on the male fastener. These nuts are often selected for service temperatures not suitable for Nylon Insert Locknuts.