Bowmalloy 36419 Hex Head Cap Screw 1/2-20 5-1/2 in Grade 9

Product Description

The BOWMALLOY 36419 is a Grade 9 alloy steel hex head cap screw designed for high-strength fastening applications in mechanical, industrial, and trade installations. Measuring 1/2-20 thread size with a 5-1/2 inch length under the head, this partially threaded fastener delivers the clamping force and shear resistance required in demanding service environments. The zinc-plated clear chromate finish provides baseline corrosion protection suitable for general indoor and sheltered outdoor use. Licensed tradespeople and industrial maintenance technicians select this fastener when torque and tensile requirements exceed what standard Grade 5 or Grade 8 hardware can reliably provide.

This cap screw is appropriate for use in heavy equipment assembly, structural bracketing, power transmission components, and mechanical systems where high-clamp-load connections are specified. The 1/2-20 fine thread pitch offers superior thread engagement and improved resistance to loosening under vibration compared to coarse-thread equivalents. It is sold in package quantities of 25, making it suitable for job-site use or shop stock replenishment.

Key Features

• Grade 9 alloy steel construction for superior tensile and proof load strength beyond Grade 8 specifications
• 1/2-20 fine thread pitch improves vibration resistance and precise torque control
• Partially threaded shank provides a bearing surface for improved shear load handling
• Zinc-plated clear chromate finish offers corrosion resistance for general-duty environments
• 5-1/2 inch length under head accommodates deep-stack or thick-material fastening applications
• Package quantity of 25 supports both single-job use and bench stock replenishment

Compatibility

Designed as a high-strength replacement or service fastener for applications specifying 1/2-20 fine thread hex head cap screws in Grade 9 alloy steel with zinc clear chromate finish.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician familiar with high-strength fastener torque requirements. Always consult the equipment manufacturer torque specification table for 1/2-20 Grade 9 fasteners before final tightening. Inspect mating threads for damage or contamination before assembly. Do not substitute this fastener in applications requiring stainless steel, metric thread pitch, or non-chromate finishes without engineering review.