Bowmalloy 36503 Hex Head Cap Screw 7/8-14 X 5 in Grade 9

Product Description

The BOWMALLOY 36503 is a Grade 9 alloy steel hex head cap screw built for high-strength fastening applications across industrial, mechanical, and structural work. Measuring 7/8-14 (UNF fine thread) in diameter with a 5-inch length under head, this partially threaded screw delivers the clamping force and shear resistance that demanding assemblies require. The clear zinc chromate finish provides baseline corrosion protection while maintaining dimensional consistency under the head. Grade 9 alloy steel exceeds the tensile strength ratings of Grade 8, making it a fit for heavy-load joints where standard hardware is not adequate.

This cap screw is used in heavy equipment, agricultural machinery, hydraulic systems, and structural fabrications where fine-thread engagement and high preload are critical. The 7/8-14 UNF thread profile is common in OEM assemblies that require precise torque control and resistance to vibration loosening. Partially threaded shanks allow for accurate shank-to-bore fits in clevis, pin-retention, and bolted flange configurations. Licensed mechanics, millwrights, and fabricators working in industrial and agricultural sectors are the primary installers of this fastener.

Key Features

• Grade 9 alloy steel construction exceeds Grade 8 minimum tensile strength requirements
• 7/8-14 UNF fine thread for precise torque control and vibration resistance
• Partially threaded shank for accurate bore-fit and shear-load applications
• Clear zinc chromate finish for corrosion resistance and clean appearance
• 5-inch length under head accommodates thick flange and structural stack-ups

Compatibility

Designed as a standard 7/8-14 UNF Grade 9 hex head cap screw suitable for heavy equipment, agricultural machinery, and industrial mechanical assemblies requiring high-strength inch-series fasteners.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with high-strength fastener procedures. Always degrease mating threads and bearing surfaces before assembly and apply the appropriate lubricant or thread treatment as specified by the equipment manufacturer before torquing. Consult the applicable equipment service manual for torque specifications, as Grade 9 fasteners require precise preload to perform correctly. Never reuse fasteners that show signs of thread damage, stretching, or corrosion.