Lock nuts are 6061 T-6 aluminum for strength with a nylon insert.
Extra support helps eliminate bending and breaking without adding any additional weight.
.500in. tall lock nuts are for 1.187in., 1.375in. and 1.500in. studs using Super Lite backers.
.750in. tall lock nuts are for 1.625in. and longer studs using Super Lite backers.
5/16in. -24 threads.
Package of 24

*Free to the contiguous United States consisting of the 48 adjoining U.S. states plus Washington, D.C., on the continent of North America. Free is not available to non-contiguous states of Alaska and Hawaii, US Protectorates, or APO, FPO or DPO locations. Photos are for reference only. Actual product may differ from the item shown in photograph.