Bowmalloy BOW36404 Hex Head Cap Screw 1/2-20 X 1 in Grade 9

Product Description

The BOWMALLOY BOW36404 is a fully threaded hex head cap screw designed for high-strength bolted connections in demanding industrial and mechanical applications. It features a 1/2-20 UNF thread and a 1-inch length under the head, manufactured from Grade 9 steel for superior tensile and proof load ratings compared to Grade 5 or Grade 8 fasteners. The Bowma-Guard finish provides a zinc-plated clear chromate coating that resists corrosion in exposed or moderately harsh environments. This screw is well suited for assembly work requiring a precise, fine-thread engagement with strong clamping force.

This cap screw is used across a wide range of industrial, mechanical, and trade applications where high-strength, fine-thread fasteners are specified. Typical install scenarios include structural assemblies, heavy equipment, hydraulic fittings, and fabrication work where Grade 9 performance is called out by engineering or maintenance specs. It is installed by machinists, millwrights, pipefitters, and general maintenance technicians. The 50-piece package quantity makes it practical for both job-site use and bench stock replenishment.

Key Features

• Grade 9 steel construction delivers high tensile strength exceeding standard Grade 5 and Grade 8 ratings
• 1/2-20 UNF fine-thread profile for precise torque control and resistance to loosening under vibration
• Fully threaded shank along the full 1-inch length under the head for maximum thread engagement
• Bowma-Guard zinc-plated clear chromate finish for corrosion resistance in moderate service environments
• Inch measurement system, UNSPSC Code 31161501 compliant
• Packaged in 50-piece quantities for efficient stock management

Compatibility

Designed as an OEM-style and aftermarket replacement hex head cap screw for any application specifying a 1/2-20 UNF x 1-inch fully threaded Grade 9 fastener in the inch measurement system.

Installation Notes

Installation is performed by qualified mechanical, maintenance, or assembly technicians using an appropriate hex wrench or socket drive sized for a 1/2-inch hex head cap screw. Always verify the mating thread is clean and free of damage before assembly. Consult the applicable equipment service manual or engineering specification for required torque values, as no torque spec is provided with this fastener listing. Follow all applicable safety standards and fastener specifications for the equipment or structure being assembled.