Bowmalloy 36013 Hex Head Cap Screw 1/4-20 X 3.5 in Grade 9

Product Description

The BOWMALLOY 36013 is a Grade 9 alloy steel hex head cap screw designed for high-strength fastening in demanding trade and industrial applications. Measuring 1/4-20 thread size by 3.5 inches in length under the head, this screw features partial threading and a clear zinc chromate finish for corrosion resistance. The Grade 9 material rating indicates higher tensile strength than standard Grade 5 or Grade 8 fasteners, making it suitable for structural and mechanical assemblies where joint integrity is critical. Licensed tradespeople across HVAC, plumbing, electrical, and mechanical trades rely on fasteners like this for equipment mounting, bracket installation, and panel assembly.

This hex head cap screw is used in a wide range of residential and commercial trade applications. Its 1/4-20 UNC thread pattern is one of the most common inch-series thread sizes found in HVAC equipment frames, electrical enclosures, pump housings, and mechanical support structures. The partially threaded shank helps maintain clamping force across joined materials. The clear zinc chromate finish provides a baseline level of corrosion protection suitable for indoor and sheltered outdoor installations.

Key Features

• Grade 9 alloy steel construction for high tensile strength beyond standard Grade 8 fasteners
• 1/4-20 UNC inch-series thread for broad compatibility with standard tapped holes and hex nuts
• 3.5-inch length under head suits applications requiring deeper fastener engagement or thicker material stacking
• Partial threading preserves shank integrity and provides reliable clamping in bolted joints
• Clear zinc chromate finish offers corrosion resistance for indoor and sheltered installations

Compatibility

Designed for use in standard 1/4-20 UNC tapped holes and with matching hex nuts in inch-system mechanical assemblies across HVAC, plumbing, electrical, and general mechanical trade applications.

Installation Notes

Installation is performed with a standard hex socket or open-end wrench sized for a 1/4-inch hex head cap screw. Always verify thread engagement and material compatibility before torquing. De-energize electrical equipment and shut off fluid systems before fastening components in live assemblies. Follow applicable mechanical codes and equipment manufacturer guidelines for fastener torque and joint preparation.