Bowmalloy 36067 Hex Head Cap Screw 3/8-16 X 4.5 in Grade 9

Product Description

The BOWMALLOY 36067 is a Grade 9 alloy steel hex head cap screw with a 3/8-16 thread size and a 4.5-inch length under head. It carries a clear zinc chromate finish for corrosion resistance in demanding service environments. This fastener is partially threaded, which helps maintain clamp load on thick structural joints by keeping the unthreaded shank in the grip area. Installers in HVAC, electrical, plumbing, and mechanical contracting regularly use Grade 9 hardware where higher tensile strength than standard Grade 5 or Grade 8 is specified.

This cap screw is suited for heavy-duty bolted assemblies in both commercial and industrial applications. It is commonly used to secure equipment bases, structural steel connections, machinery mounts, and fabricated brackets. The 3/8-16 coarse thread engages quickly and performs reliably in through-bolted applications where a standard hex wrench or socket can be used. Partial threading on a 4.5-inch length makes it appropriate for joints requiring a full bearing shank through stacked material layers.

Key Features

• Grade 9 alloy steel construction for high tensile strength beyond standard Grade 8 ratings
• 3/8-16 UNC coarse thread for fast engagement and broad tool compatibility
• 4.5-inch length under head accommodates deep or stacked joint configurations
• Partial threading keeps unthreaded shank in the grip zone for improved clamp load
• Clear zinc chromate finish provides corrosion resistance in typical service conditions

Compatibility

Designed for use in standard 3/8-16 UNC threaded assemblies requiring Grade 9 alloy steel fasteners in inch-measurement applications.

Installation Notes

Installation should be performed by a qualified mechanic or millwright following the applicable torque specifications for Grade 9 fasteners at this thread size. Always confirm the mating nut or tapped hole is rated for the same grade and thread class before assembly. Use a properly sized hex socket or wrench to avoid rounding the head. Inspect threads for contamination or damage before installation and replace any fastener that shows corrosion, deformation, or incomplete thread engagement.