Bowmalloy BOW36418 Hex Head Cap Screw 1/2-20 X 5 in Grade 9

Product Description

The BOWMALLOY BOW36418 is a Grade 9 steel hex head cap screw sized 1/2-20 x 5 inches with partial threading and a Bowma-Guard zinc-plated clear chromate finish. Grade 9 fasteners meet higher tensile strength requirements than standard Grade 5 or Grade 8 hardware, making this screw appropriate for heavy-duty structural and mechanical assemblies. The Bowma-Guard coating provides corrosion resistance in environments where bare steel would degrade. This fastener uses inch-standard threading and is installed using standard hex drive tooling. Maintenance technicians, millwrights, and trade contractors working on equipment assemblies will find this screw suited to high-load joint applications.

This cap screw is used in industrial, mechanical, and structural assembly applications where a partially threaded inch-series fastener is required. Partial threading ensures that the unthreaded shank bears shear loads cleanly across joint interfaces rather than relying solely on thread engagement. Typical applications include securing heavy equipment frames, flanged connections, and machinery mounts where Grade 9 tensile strength is specified by the equipment manufacturer or engineering drawing.

Key Features

• Grade 9 steel construction for high tensile strength in demanding mechanical applications
• 1/2-20 inch thread size with 5-inch length under head
• Partially threaded shank for clean shear-load distribution across joint interfaces
• Bowma-Guard zinc-plated clear chromate finish for corrosion resistance
• Inch measurement system compatible with standard hex drive tooling

Compatibility

Designed as a standard inch-series hex head cap screw for use in mechanical and structural assemblies specifying 1/2-20 thread pitch, 5-inch grip length, and Grade 9 tensile strength.

Installation Notes

Installation should be performed by qualified millwrights, maintenance technicians, or trade contractors following the applicable engineering specifications or equipment service documentation. Power down and de-energize all connected equipment before fastener replacement or assembly work. Use a properly sized hex socket or wrench to avoid rounding the fastener head. Torque to the value specified in the equipment manufacturer documentation or applicable structural standard for Grade 9 hardware in the joint configuration being serviced.