Bowmalloy 36042 Hex Head Cap Screw 5/16-18 X 5 in Grade 9

Product Description

The BOWMALLOY 36042 is a Grade 9 alloy steel hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. With a 5/16-18 thread size and a 5-inch length under head, this partially threaded fastener delivers reliable clamping force in applications where standard Grade 5 or Grade 8 hardware falls short. The zinc-plated clear chromate finish provides a baseline level of corrosion resistance suitable for indoor and light-duty protected environments. Installers across multiple trades use Grade 9 cap screws where elevated tensile strength and proof load requirements are specified.

This fastener is appropriate for use in heavy equipment assemblies, industrial machinery mounting, structural steel connections, and other demanding mechanical applications. The 5/16-18 coarse thread pattern is compatible with standard inch-series tapped holes and hex nuts of matching specification. Partial threading allows for shank engagement in clearance holes, which improves alignment and shear resistance in bolted joints. This screw is sold in packages of 50 units with a minimum order quantity of 1 package.

Key Features

• Grade 9 alloy steel construction for higher tensile strength than standard Grade 5 or Grade 8 fasteners
• 5/16-18 coarse thread, inch-series, for compatibility with standard tapped holes and nuts
• 5-inch length under head provides extended grip range for thick material stacking
• Partially threaded shank improves shear load performance and joint alignment
• Zinc-plated clear chromate finish offers corrosion resistance for protected indoor installations
• Packaged in quantities of 50 for shop stock and job-site use

Compatibility

Designed as an OEM-style and aftermarket replacement hex head cap screw for applications specifying 5/16-18 coarse thread, Grade 9 alloy steel fasteners in inch-measurement systems.

Installation Notes

Installation should be performed by a qualified mechanic or trades professional following applicable equipment manufacturer torque specifications for Grade 9 fasteners at this thread size. Always verify thread engagement depth and mating nut or tapped hole grade before final torque. Inspect the zinc-plated finish for damage before installation; compromised coating in corrosive environments may require additional protective treatment or a different finish specification. Do not mix inch-series and metric hardware in the same joint.