Value Collection 402078PR Hex Head Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 402078PR is a 5/16-18 UNC hex head cap screw measuring 4.5 inches in length under head. Manufactured from Grade 2 steel with a bright, uncoated finish, this fastener features partial threading along its shank. It is suited for general-purpose mechanical assembly and structural fastening applications across industrial, commercial, and trade environments. Licensed tradespeople and maintenance professionals working with standard inch-series fastener specifications will find this screw compatible with common 5/16-18 tapped holes and hex drive tooling.

This cap screw is appropriate for use in light to medium-duty fastening applications where a standard UNC thread form is required. The partially threaded shank provides a smooth bearing surface that helps align and clamp joined materials without thread engagement along the full grip length. Typical applications include equipment assembly, framing fixtures, and mechanical enclosures where Grade 2 steel tensile strength meets the design requirement.

Key Features

• 5/16-18 UNC thread size for compatibility with standard inch-series tapped holes and nuts
• 4.5-inch length under head with partial threading for a smooth shank grip zone
• Grade 2 steel construction suitable for general-purpose fastening loads
• Bright, uncoated finish — no added plating that could affect dimensional tolerance in close-tolerance applications
• Hex head drive accepts standard SAE hex wrenches and sockets

Compatibility

Designed as a standard inch-series UNC hex head cap screw for general mechanical and structural fastening applications requiring a 5/16-18 thread form.

Installation Notes

Installation is performed using a standard SAE hex wrench or socket driver sized for a 5/16-inch hex head cap screw. Ensure the mating tapped hole or nut is clean and free of debris before threading. Apply appropriate torque per the fastener grade and joint design requirements — do not over-torque Grade 2 fasteners, as they have lower tensile strength than Grade 5 or Grade 8 hardware. Follow applicable mechanical codes and equipment manufacturer guidelines for fastener selection and torque specification.