Bowmalloy 36406 Hex Head Cap Screw 1/2-20 X 1-1/2 in Grade 9

Product Description

The BOWMALLOY 36406 is a fully threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Manufactured from Grade 9 alloy steel, this fastener delivers superior tensile and proof load strength compared to Grade 5 and Grade 8 hardware. The 1/2-20 thread pitch is a fine-thread designation that provides increased thread engagement and resistance to loosening under vibration. The clear zinc chromate finish provides a baseline layer of corrosion protection suitable for general service environments. Tradespeople across HVAC, plumbing, and mechanical contracting use Grade 9 fasteners where elevated clamping force and fatigue resistance are required.

This cap screw is sized at 1/2-20 x 1-1/2 inches, making it a common choice for flange bolting, equipment mounting, and machinery assembly where a fine-thread, high-strength hex head fastener is specified. The fully threaded shank allows for maximum engagement across the entire grip length, which is particularly useful in shallow-clearance or thin-material installations. It suits both new construction and replacement service work on industrial equipment and mechanical systems.

Key Features

• Grade 9 alloy steel construction for high tensile and proof load strength
• 1/2-20 fine-thread form improves vibration resistance and thread engagement
• Fully threaded shank maximizes clamping force across the full grip length
• Clear zinc chromate finish provides corrosion resistance for general service use
• Hex head drive compatible with standard hex wrenches and impact sockets

Compatibility

Designed as a high-strength replacement or service fastener for applications requiring a 1/2-20 fine-thread hex head cap screw in Grade 9 alloy steel.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson using the appropriate torque specifications called out by the equipment or assembly manufacturer. Always verify thread engagement depth before final torque. Do not mix inch and metric fasteners in the same assembly. Clean threads and mating surfaces before installation to ensure accurate torque readings.