Bowmalloy BOW36146 Hex Head Cap Screw 5/8-11 Grade 9

Product Description

The BOWMALLOY BOW36146 is a fully threaded hex head cap screw designed for high-strength fastening applications in structural, mechanical, and industrial assemblies. It is manufactured from Grade 9 steel, which delivers tensile strength above standard Grade 5 and Grade 8 fasteners, making it a reliable choice where elevated load-bearing performance is required. The screw measures 5/8-11 thread size with a 1-1/4 inch length under the head and carries a Bowma-Guard finish for enhanced corrosion resistance. Electricians, millwrights, HVAC installers, and general mechanical contractors commonly use Grade 9 cap screws in equipment mounting, structural connections, and machinery assembly.

This cap screw is suited for residential and commercial installations where inch-series fasteners are specified. The 5/8-11 thread pitch is a coarse-thread Unified National Coarse (UNC) configuration, which seats quickly and resists cross-threading during installation. The Bowma-Guard finish provides a protective coating layer that helps resist corrosion in moderate-exposure environments. Typical applications include equipment bases, flanged connections, steel framework, and mechanical component mounting across HVAC, plumbing, electrical, and general industrial settings.

Key Features

• Grade 9 steel construction for high-strength fastening above standard Grade 8 performance
• Fully threaded shank provides consistent thread engagement along the full 1-1/4 inch length
• 5/8-11 UNC coarse thread for fast seating and reduced cross-threading risk
• Bowma-Guard finish offers corrosion resistance for moderate-exposure service environments
• Inch-measurement system for compatibility with standard SAE tooling and torque specifications

Compatibility

Designed as an OEM-style replacement or direct-use fastener for applications requiring 5/8-11 inch-series hex head cap screws in Grade 9 steel. Consult equipment documentation to confirm thread engagement length and grade requirements before installation.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with torque requirements for Grade 9 fasteners. Always de-energize or shut down equipment before replacing or tightening fasteners on mechanical assemblies. Use calibrated torque tools and follow the equipment manufacturer specifications for proper clamp load. Inspect mating threads for damage or contamination before installation to ensure full thread engagement.