Bowmalloy BOW36142 Hex Cap Screw 9/16-12 X 4.5 in Grade 9

Product Description

The BOWMALLOY BOW36142 is a Grade 9 steel hex head cap screw sized at 9/16-12 thread with a 4-1/2 inch length under the head. Partially threaded along its shank, this fastener is engineered for high-strength bolted connections in demanding mechanical and structural applications. The Bowma-Guard zinc-plated clear chromate finish provides corrosion resistance suited to both indoor and outdoor installations. Licensed tradespeople and industrial maintenance technicians reach for Grade 9 fasteners when joint integrity under heavy load or vibration is a requirement.

This cap screw is appropriate for use in heavy equipment assembly, mechanical mounting, structural steel connections, and industrial maintenance applications. The 9/16-12 Unified National Coarse (UNC) thread pattern is a standard inch-series size found across a wide range of fabricated assemblies and OEM equipment. The partial threading leaves a smooth shank section that provides shear strength across the grip length, making it well suited for applications where the bolt passes through clearance holes before engaging a nut or tapped bore.

Key Features

• Grade 9 steel construction delivers high tensile and proof load ratings for demanding structural and mechanical joints
• 9/16-12 UNC thread size is a widely used inch-series standard for compatibility across common hardware
• 4-1/2 inch length under head accommodates thick stock, stacked plates, or deep clamping applications
• Partial threading preserves a smooth shank for shear load resistance and precise fit in clearance-hole assemblies
• Bowma-Guard zinc-plated clear chromate finish resists oxidation in exposed or moderately harsh environments

Compatibility

Designed as a standard inch-series hex head cap screw for use with 9/16-12 UNC nuts, tapped holes, or threaded inserts in steel, iron, or similarly machinable substrates.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using calibrated torque equipment appropriate for Grade 9 fasteners. Always consult the equipment manufacturer or applicable structural specifications for required torque values before tightening. Inspect the mating thread, bearing surface, and fastener for damage before assembly. Do not reuse fasteners that show signs of thread deformation, corrosion under the plating, or elongation.