5/16"-18 316 Stainless Steel Coarse Thread Lock Nuts

Diameter: 5/16"
Diameter 2: 9/16"
Material: Stainless Steel
Driver Type: 1/2" Wrench
Thread Size: 18 (Coarse)
Hardness: 316
Type: Lock Nut

Box of 15.

A lock nut is a nut that resists loosening under vibrations and torque.