Value Collection 39242 Hex Head Cap Screw 1-1/4-7 X 4 in Grade 8

Product Description

The VALUE COLLECTION 39242 is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical assemblies, structural connections, and industrial equipment. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers elevated tensile strength and corrosion resistance. The 1-1/4-7 UNC thread size and 4-inch length under head make it suited for heavy-duty bolted joints where precise thread engagement and clamping force are required. Licensed tradespeople and maintenance professionals install this type of fastener in demanding environments where standard Grade 5 hardware is insufficient.

This cap screw is used in industrial machinery, structural steel assemblies, heavy equipment maintenance, and fabrication work requiring Inch-system UNC fasteners. The partial threading allows for a smooth shank section that improves shear load handling in bolted connections. It conforms to ASME B18.2.1, making it suitable for applications where dimensional compliance to that standard is specified. The zinc yellow dichromate finish provides a measurable level of corrosion protection suitable for indoor and light industrial environments.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish provides corrosion resistance and visual identification as a high-strength fastener
• Partially threaded shank improves shear load performance in bolted assemblies
• 1-1/4-7 UNC thread standard ensures broad compatibility with standard Inch-system nuts and tapped holes
• Conforms to ASME B18.2.1 for consistent dimensional tolerances
• Packaged in a quantity of 5 per unit

Compatibility

Designed for use with standard 1-1/4-7 UNC Inch-series hex nuts, flat washers, and tapped holes conforming to ASME thread standards in heavy-duty mechanical and structural applications.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or structural tradespeople using the appropriate hex drive tooling. Always verify hole size, thread engagement depth, and mating nut grade before installation. Grade 8 fasteners require torque values referenced from an approved fastener torque specification chart for the given diameter and lubrication condition — do not estimate. Inspect threads for damage before installation and replace any fastener that shows galling, corrosion, or deformation.