Prime-Line 5/16 in.-18 Zinc Plated Steel K-Lock Nuts with External Tooth Washer (50-Pack)

K-lock nuts feature a built in external tooth lock washer that is free spinning. The teeth on the lock washer can bite into the surface and help lock the nut into place. They can be more convenient than using a standard hex nut along with a separate external tooth lock washer. As with standard hex nuts, they can be installed using a wrench or socket set.

• Allows more torqe to keep nut in place
• Holds nut with more surface tension
• Steel construction offers long-lasting use and solid performance