Bowmalloy 36069 Hex Head Cap Screw 3/8-16 X 5.5 in Grade 9

Product Description

The BOWMALLOY 36069 is a Grade 9 alloy steel hex head cap screw built for high-strength fastening applications where standard hardware falls short. Measuring 3/8-16 thread size with a 5.5-inch length under head, this screw features partial threading and a clear zinc chromate finish that provides corrosion resistance in demanding environments. The Grade 9 designation places it above Grade 8 in tensile strength, making it a preferred choice for heavy equipment, hydraulic systems, and structural assemblies. Installers in HVAC, mechanical, and industrial trades reach for Grade 9 fasteners when joint integrity under vibration and load is a primary concern.

This cap screw is suited for use in inch-standard mechanical assemblies requiring a robust 3/8-16 coarse-thread fastener in a longer length. The 5.5-inch shank accommodates thick material stacks or applications with significant clamping distance. The partial threading allows the unthreaded shank to act as a shoulder or shear member in bolted connections, adding positional accuracy and shear load capacity. Common applications include equipment mounting, bracket fabrication, and structural fastening across residential and commercial mechanical installations.

Key Features

• Grade 9 alloy steel construction for tensile strength exceeding Grade 8 requirements
• 3/8-16 UNC coarse thread for broad compatibility with standard inch-series hardware
• 5.5-inch length under head suits deep or thick material stack-ups
• Partially threaded shank provides shear resistance and positional control in bolted joints
• Clear zinc chromate finish delivers corrosion protection in typical service environments

Compatibility

Designed as a standard inch-series hex head cap screw compatible with 3/8-16 UNC threaded nuts, inserts, and tapped holes in mechanical assemblies.

Installation Notes

Installation requires a standard hex wrench or socket driver sized for a 3/8-16 cap screw head. Always torque to the specification required by the joint design or equipment manufacturer using a calibrated torque wrench. Verify thread engagement depth meets minimum requirements before final tightening. De-energize and lock out any equipment before servicing fastened assemblies per applicable safety standards.