Bowmalloy BOW36786 Hex Lock Nut 5/8-11 Grade 9

Product Description

The BOWMALLOY BOW36786 is a Grade 9 steel hex lock nut designed for high-strength fastening applications where vibration resistance and clamping integrity are critical. Threaded at 5/8-11 (UNC) with a right-hand thread direction, this nut features a Bowma-Guard cadmium waxed finish that provides corrosion and wear protection. At 0.542 inches in height with a 15/16-inch (0.9375 inches) width across flats, it fits standard 15/16-inch hex tooling. Grade 9 steel offers higher proof load and tensile strength than Grade 5 or Grade 8, making it a go-to choice for demanding structural, mechanical, and industrial fastening tasks handled by millwrights, maintenance technicians, and mechanical contractors.

This hex lock nut is suited for heavy-duty bolted assemblies in industrial machinery, structural steel, agricultural equipment, and commercial vehicle applications where fasteners are exposed to dynamic loads or sustained vibration. The 5/8-11 UNC thread size is among the most common inch-series heavy fastener threads, making this nut a practical stock item for field service kits and shop inventory. Sold in a package quantity of 50, it is appropriate for both single-repair use and batch assembly work.

Key Features

• Grade 9 steel construction for superior proof load and tensile strength versus Grade 5 and Grade 8 nuts
• Bowma-Guard cadmium waxed finish provides corrosion resistance and lubricity for consistent torque application
• 5/8-11 UNC right-hand thread for compatibility with standard inch-series fastener systems
• 15/16-inch width across flats fits standard hex sockets and open-end wrenches
• Package quantity of 50 supports both repair and production assembly needs

Compatibility

Designed for use with 5/8-11 UNC inch-series threaded bolts and studs in heavy-duty mechanical and structural assemblies requiring Grade 9 fastener specifications.

Installation Notes

Installation is typically performed by millwrights, mechanical technicians, or structural tradespeople using a 15/16-inch socket or open-end wrench. Always ensure the mating bolt or stud is also rated to Grade 9 or equivalent to avoid mismatched fastener strength. Power down or de-energize any equipment before working on bolted assemblies on live machinery. Follow applicable torque specifications from the equipment manufacturer or relevant industry standards for the 5/8-11 thread size and Grade 9 material grade.