Bowmalloy 36377 Hex Head Cap Screw 7/16-20 X 3/4 in Grade 9

Product Description

The BOWMALLOY 36377 is a fully threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assemblies. Manufactured from Grade 9 alloy steel, it delivers tensile strength above standard Grade 8 hardware, making it a preferred choice where fatigue resistance and clamp load matter. The 7/16-20 fine thread provides precise torque control and strong thread engagement in steel and aluminum components. A zinc-plated clear chromate finish adds corrosion resistance for moderate-exposure environments. Licensed tradespeople, millwrights, and field technicians install this fastener where reliable, high-torque connections are required.

This screw suits a wide range of trade applications including HVAC equipment mounting, mechanical power transmission assemblies, pump and motor brackets, and heavy equipment repairs. The fine-thread 7/16-20 pitch is especially effective in thin-walled tapped holes and applications requiring vibration resistance. The 3/4-inch length under head makes it appropriate for shallow through-hole and tapped-hole installations in moderate-thickness material. It is sold in packages of 50 units, supporting both single-job use and bench-stock replenishment.

Key Features

• Grade 9 alloy steel construction exceeds Grade 8 minimum tensile requirements for demanding fastening applications
• 7/16-20 fine thread provides tight thread engagement and improved vibration resistance compared to coarse thread
• Fully threaded shank maximizes thread engagement across the full 3/4-inch working length
• Zinc-plated clear chromate finish provides moderate corrosion protection in indoor and light-exposure environments
• Standard hex head accepts common 5/8-inch wrench or socket tooling
• Packaged in quantities of 50, suitable for bench stock or single-trade applications

Compatibility

Designed as a high-strength inch-series hex head cap screw for use in any application requiring a 7/16-20 fine-thread fastener with a 3/4-inch length under head.

Installation Notes

Installation should be performed by qualified tradespeople following applicable mechanical codes and equipment manufacturer torque specifications. Always ensure the mating tapped hole or nut matches the 7/16-20 fine-thread specification before assembly. De-energize and lock out equipment before replacing fasteners on live mechanical systems. Do not mix Grade 9 hardware with lower-grade nuts or threaded inserts, as mismatched hardware grades can reduce joint integrity.