Centered around our proprietary all-steel locking insert technology ,designed to last, and built in the USA for more than 50 years. The Security Locknut fastening solution delivers what you are looking for... improved performance that results in less maintenance and greater productivity! The proven and field tested design of the Security Locknut is the fastening solution that's serving the needs of a wide range of industries throughout the world. There are no other fastener systems that perform like those from Security Locknut. Where heavy vibration, high temperatures, or repeated removal without damaging the bolt is a concern, the Security Locknut is the product of choice. The Security Locknut conforms to a variety of appropriate international fastening standards.