Value Collection 99031 Hex Head Cap Screw 5/16-18 Grade 8 100pk

Product Description

The VALUE COLLECTION 99031 is a 5/16-18 x 1-1/2 inch hex head cap screw manufactured from Grade 8 steel with a bright, uncoated finish. Partially threaded along its shank, this fastener is designed for high-strength bolted connections in demanding mechanical and structural applications. Grade 8 steel provides greater tensile strength than Grade 5 or Grade 2 fasteners, making it a reliable choice where joint integrity is critical. Sold in a package of 100 pieces, this screw meets ASME B18.2.1 dimensional standards for inch-series hex head cap screws. Machinists, millwrights, equipment assemblers, and maintenance technicians commonly spec this fastener for heavy equipment, tooling, and fabrication work.

This cap screw is suited for general industrial, commercial, and heavy-duty maintenance applications requiring a high-strength UNC-threaded fastener. The 5/16-18 UNC thread pitch is a widely used coarse thread standard compatible with standard tapping and fastener tooling. The partial threading is appropriate for applications where a shoulder or grip length under the head is needed to maintain clamping load across unthreaded material. This 100-piece package is practical for shop stock, service van inventory, or production line use.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 5/16-18 UNC coarse thread for broad compatibility with standard taps and nuts
• Partially threaded shank provides a grip length under the head
• Bright uncoated finish — suitable for use with plated nuts or in dry indoor environments
• Meets ASME B18.2.1 dimensional standards for inch-series hex head cap screws
• Packaged in quantities of 100 for shop stock or production use

Compatibility

Designed as a standard inch-series hex head cap screw for use with 5/16-18 UNC threaded holes, nuts, and inserts in general industrial, mechanical, and structural assemblies.

Installation Notes

Installation is performed with a standard 1/2-inch hex wrench or socket. Always verify the mating thread is 5/16-18 UNC before installation. Torque to the appropriate specification for Grade 8 fasteners as listed in your application engineering reference or applicable code. Do not use an impact driver without a torque-limiting method, as over-torque can yield Grade 8 cap screws in smaller diameters.