Value Collection 39627 Hex Lock Nut 5/8-11 Grade 8

Product Description

The VALUE COLLECTION 39627 is a 5/8-11 hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel in an uncoated finish. This nut is designed to resist loosening under vibration and dynamic loads by using a nylon collar that deforms against the mating thread to maintain clamping force. It measures 0.75 inches in height and 0.9375 inches across the flats. The right-hand thread follows UNC fastener standards. This fastener is installed by mechanics, millwrights, and maintenance technicians in structural, mechanical, and equipment assembly applications where a reliable prevailing-torque lock is required.

The 39627 is suited for bolted assemblies in industrial equipment, heavy machinery, agricultural equipment, and structural frameworks where vibration or cyclic loading could otherwise allow conventional nuts to back off. The Grade 8 steel construction makes it appropriate for high-strength bolted joints. The uncoated finish means the installer should account for corrosion exposure when selecting this fastener for outdoor or wet-environment use. This nut is sold individually with a minimum order quantity of 100 pieces.

Key Features

• Nylon insert locking style provides a prevailing-torque fit that resists vibration-induced loosening
• Grade 8 steel construction rated for high-strength bolted joint applications
• 5/8-11 UNC thread size with right-hand thread direction
• 0.75 inches height and 0.9375 inches width across flats for standard hex wrench fitment
• Uncoated finish — no plating or coating that could affect thread tolerance

Compatibility

Designed for use with 5/8-11 UNC threaded fasteners and bolts conforming to inch-series fastener standards. This nut does not meet military specifications.

Installation Notes

Installation is performed with a standard open-end, box-end, or socket wrench sized to the 0.9375-inch across-flats dimension. Nylon insert lock nuts are generally single-use — the nylon element loses clamping effectiveness after repeated removal and reinstallation. Always verify that the mating bolt grade is compatible with Grade 8 hardware to maintain joint integrity. Follow applicable torque specifications from engineering drawings or fastener standards tables for the joint being assembled.