This Hex Jam Nut from Miller Industries has a 1/2" diameter with 13 threads per inch. It isused on the Winch Clutch Control of 4-Ton Hydraulic Winches, H-246 and HD-200R. This winch assembly is used on several Gen 2 Miller Car Carriers, including Century, Challenger, Champion, Holmes, and Vulcan Carriers. Use one per handle.
