Value Collection 454319PR Hex Head Cap Screw 1/2-13 X 4-1/4 in Grade 8

Product Description

The VALUE COLLECTION 454319PR is a Grade 8 steel hex head cap screw sized 1/2-13 x 4-1/4 inches, partially threaded with a UNC thread standard. It carries a zinc yellow dichromate finish that provides corrosion resistance in demanding service environments. This fastener is built to ASME B18.2.1 and SAE J429 standards, meeting the tensile strength requirement of 150,000 psi characteristic of Grade 8 hardware. It is installed using a 3/4-inch hex key or standard hex socket. Machinists, millwrights, maintenance technicians, and industrial tradespeople use this style of fastener in structural assemblies, equipment mounting, and heavy mechanical connections.

This cap screw is suited for high-strength bolted joint applications in industrial, commercial, and heavy-equipment settings. Partial threading allows the unthreaded shank to bear shear loads while the threaded section engages the nut or tapped hole securely. The zinc yellow dichromate finish makes it appropriate for use in moderately corrosive environments where bare steel hardware would be insufficient. Typical applications include machinery frames, structural steel connections, jig and fixture assembly, and general mechanical maintenance work requiring a reliable, high-tensile fastener.

Key Features

• Grade 8 steel construction with 150,000 psi tensile strength for high-load applications
• Partially threaded shank accommodates shear loading along the bolt body
• Zinc yellow dichromate finish provides corrosion resistance beyond bare or zinc-clear finishes
• UNC 1/2-13 thread pitch for wide compatibility with standard nuts and tapped holes
• Meets ASME B18.2.1 and SAE J429 standards for dimensional and mechanical conformance
• 3/4-inch hex drive fits standard sockets and wrenches commonly found in trade toolkits

Compatibility

Designed for use in standard UNC 1/2-13 threaded applications requiring a Grade 8 hex head cap screw with partial threading and a 4-1/4-inch length under head.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance tradespeople. De-energize and lock out all equipment before disassembly or fastener replacement in mechanical assemblies. Use a calibrated torque wrench and follow the joint designer's torque specification for Grade 8 hardware at this diameter. Do not mix Grade 8 fasteners with lower-grade nuts or tapped holes that are not rated for the corresponding load.