Bowmalloy 36161 Hex Head Cap Screw 5/8-11 X 6 in Grade 9

Product Description

The BOWMALLOY 36161 is a Grade 9 alloy steel hex head cap screw sized at 5/8-11 thread with a 6-inch length under the head. It carries a clear zinc chromate finish for corrosion resistance and is partially threaded, which is standard for heavy-duty fastener applications requiring clamping strength in the unthreaded shank area. This screw is used by mechanical contractors, millwrights, and industrial maintenance technicians in structural, machinery, and heavy-equipment assembly work where high-strength fasteners are required.

This cap screw is suited for industrial and commercial applications that demand high tensile strength beyond the Grade 5 and Grade 8 classifications. Typical installation scenarios include structural steel connections, heavy machinery frames, agricultural equipment, mining equipment, and other applications where superior clamp load and fatigue resistance are critical. The 5/8-11 coarse thread pattern provides strong engagement in steel and iron threaded holes or with standard hex nuts.

Key Features

• Grade 9 alloy steel construction provides higher tensile strength than standard Grade 8 fasteners
• Clear zinc chromate finish offers corrosion protection for service in demanding environments
• Partial threading delivers maximum clamping force through the unthreaded shank section
• 5/8-11 coarse thread pattern for compatibility with standard UNC hex nuts and tapped holes
• 6-inch length under head accommodates thick material stacks and deep joint assemblies

Compatibility

Designed as a high-strength replacement or new-install fastener for applications requiring a 5/8-11 UNC coarse-thread hex head cap screw in Grade 9 alloy steel with a clear zinc chromate finish.

Installation Notes

Installation is typically performed by licensed millwrights, mechanical contractors, or industrial maintenance technicians. Always verify hole thread engagement depth and mating nut grade before torquing. Follow applicable ASME or AISC standards for fastener torque and joint design. Inspect threads and finish for damage before installation, and do not install fasteners with compromised coatings in corrosive service environments.