Fastener SuperStore, Inc. Flex-Locknut 457730

5/16-18 Flex-Locknuts / Thin Height / 18-8 Stainless Steel An all-metal, one-piece, hex-shaped lock nut with a round collar at its back end. The collar is segmented with opposed slots cut into it above each corner of the nut. When the screw or bolt reaches the collar, the slotted portion expands which creates the prevailing torque locking action. The light hex, thin height variety is approximately 30% shorter than the full height nut. The thin height light hex flexible lock nut is used when an insufficient number of projecting threads are present to use a full height nut, or when a lighter-weight nut is required. Flexible lock nuts maintain their locking strength through 15 removals and re-applications. The temperature service limit for steel nuts is 550°F (450°F if zinc or cadmium plated); the temperature limit for stainless nuts (with no additional finish) is 800°F. They have superior resistance to vibration compared to all other lock nut varieties and do not gall threads.