Bowmalloy 36203 Hex Head Cap Screw 7/8-9 X 5 in Grade 9

Product Description

The BOWMALLOY 36203 is a hex head cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. Manufactured from Grade 9 alloy steel, this fastener delivers elevated tensile strength over standard Grade 5 or Grade 8 hardware, making it well suited for demanding load-bearing connections. The 7/8-9 thread size with a 5-inch length under the head provides substantial grip length for through-bolting or deep tapped hole applications. A clear zinc chromate finish provides baseline corrosion resistance. The screw is partially threaded, which helps maintain shear strength across the joint interface. Millwrights, maintenance mechanics, and structural assemblers are the typical installers.

This cap screw is used in heavy equipment assembly, industrial machinery, structural steel connections, and agricultural or construction equipment repairs where Grade 9 alloy steel strength ratings are specified. The 7/8-9 Unified National Coarse thread profile is a standard designation in inch-series fastener applications across manufacturing and field maintenance environments. Partial threading suits through-bolt configurations where an unthreaded shank spans the joint shear plane, maintaining joint integrity under lateral loading.

Key Features

• Grade 9 alloy steel construction for high tensile strength beyond standard Grade 8 fasteners
• 7/8-9 UNC thread size in the inch measurement system
• 5-inch length under head accommodates deep through-bolt and tapped hole applications
• Partially threaded shank supports shear-critical joint configurations
• Clear zinc chromate finish provides corrosion resistance for general industrial service
• Standard hex head drive accepts common box-end wrenches and impact sockets

Compatibility

Designed as a standard inch-series hex head cap screw compatible with any application specifying a 7/8-9 UNC Grade 9 alloy steel fastener with a 5-inch grip length.

Installation Notes

Installation is performed by mechanics, millwrights, or structural assemblers using calibrated torque wrenches or impact tools with a 7/8-inch hex socket. Always consult the applicable torque specification table for Grade 9 hardware at the required clamp load before final tightening. Inspect threads and mating tapped holes for damage or contamination before assembly. Do not reuse fasteners that show signs of thread galling, corrosion, or prior yielding.