Bowmalloy BOW36030 Hex Head Cap Screw 5/16-18 X 1-1/4 in

Product Description

The BOWMALLOY BOW36030 is a fully threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assembly work. Built to Grade 9 steel specifications, this fastener delivers superior tensile and proof load strength compared to standard Grade 5 or Grade 8 hardware. It measures 5/16-18 thread size with a 1-1/4 inch length under head and is finished with BOWMALLOY Bowma-Guard zinc plating for corrosion resistance. Electricians, pipefitters, HVAC technicians, and general mechanical contractors use Grade 9 cap screws where high-clamp-load fastening is required in demanding service environments.

This cap screw is suited for use in equipment mounting, bracket assembly, structural connections, and mechanical component fastening across residential, commercial, and light industrial applications. The 5/16-18 UNC thread is a common coarse-thread size compatible with standard tapped holes and hex nuts of the same thread designation. The fully threaded shank maximizes thread engagement across the full grip length, making it appropriate for thinner material stacks and through-bolt configurations.

Key Features

• Grade 9 steel construction for high tensile strength beyond standard Grade 8 fasteners
• Fully threaded shank for maximum thread engagement across the entire fastener length
• Bowma-Guard zinc-plated clear chromate finish for corrosion protection
• 5/16-18 UNC coarse thread - widely compatible with standard tapped holes and nuts
• 1-1/4 inch length under head suits a range of material thicknesses and stack configurations
• Inch measurement system; UNSPSC Code 31161501

Compatibility

Designed for use with standard 5/16-18 UNC tapped holes, hex nuts, and coupling nuts in inch-measurement fastening applications across mechanical and structural assembly.

Installation Notes

Installation should be performed by a qualified mechanic, technician, or tradesperson using an appropriately sized hex wrench or socket driver. Always verify that the mating thread is clean, undamaged, and the correct 5/16-18 UNC specification before assembly. Follow applicable torque specifications from the equipment manufacturer or relevant structural standards - do not estimate torque values without a calibrated torque wrench. Inspect the finish for damage before installation; compromised plating reduces corrosion resistance in wet or outdoor environments.