Value Collection D39146 Hex Head Cap Screw 5/8-11 X 1-1/4 in Grade 8

Product Description

The VALUE COLLECTION D39146 is a fully threaded hex head cap screw designed for high-strength fastening applications. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The 5/8-11 UNC thread size and 1-1/4 inch length under head make it suited for structural assemblies, heavy equipment, and mechanical installations where fastener integrity is critical. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent fit across standard hex tooling and hardware. Maintenance technicians, millwrights, and general contractors working with inch-series fastener systems will find this screw compatible with widely available 15/16 inch hex drive tooling.

This cap screw is used across a broad range of industrial and commercial applications including equipment mounting, structural steel connections, machinery assembly, and heavy-duty bracketing. Its full-thread configuration provides maximum thread engagement throughout the grip length, making it well suited for through-bolting applications or assemblies where nut engagement along the full shaft is required. The zinc yellow dichromate coating provides a sacrificial barrier against oxidation, making it appropriate for indoor and moderately protected outdoor installations.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Fully threaded shaft maximizes thread engagement in through-bolt and nut applications
• Zinc yellow dichromate finish provides corrosion resistance and visual identification as Grade 8
• 5/8-11 UNC thread pattern conforms to Unified National Coarse inch-series standards
• Meets ASME B18.2.1 dimensional standards for hex head cap screws
• 1-1/4 inch length under head suits medium-depth fastening applications

Compatibility

Designed as a standard inch-series hex head cap screw compatible with 5/8-11 UNC nuts, threaded inserts, and tapped holes conforming to Unified National Coarse thread specifications per ASME B18.2.1.

Installation Notes

Installation is performed by millwrights, maintenance technicians, or general trade workers using a 15/16 inch hex wrench or socket driver. Always ensure mating threads are clean and free of debris before installation. Do not reuse fasteners that show signs of thread deformation, corrosion damage, or prior overtorque. Follow applicable equipment manufacturer torque specifications and relevant structural or mechanical codes for the installation context.