Value Collection 99037 Hex Head Cap Screw 5/16-18 X 3 in Grade 8

Product Description

The VALUE COLLECTION 99037 is a 5/16-18 hex head cap screw measuring 3 inches under the head, manufactured from Grade 8 steel with an uncoated finish. Partially threaded along the shank, this fastener meets ASME B18.2.1 dimensional standards for inch-series hex cap screws. Grade 8 steel delivers high tensile strength suited to demanding mechanical and structural connections. The unified coarse (UNC) thread form provides reliable thread engagement in standard tapped holes. Sold in a pack of 100, this screw is a common shop and field inventory item for mechanics, millwrights, and maintenance technicians working on equipment assemblies, machinery frames, and structural brackets.

This hex head cap screw is used across general industrial, mechanical, and construction applications where a high-strength inch-series fastener is required. Typical installation scenarios include bolting steel components, securing equipment mounts, assembling structural frames, and replacing worn or damaged hardware on machinery. The partially threaded shank allows for a smooth bearing surface on one clamped member, improving joint integrity under shear or vibration loads. The uncoated finish is suitable for applications where post-installation coating or plating will be applied, or where coating is not required by the assembly specification.

Key Features

• Grade 8 steel construction for high tensile strength in demanding fastening applications
• 5/16-18 UNC thread form for compatibility with standard inch-series tapped holes and nuts
• 3-inch length under head with partial threading for improved shear performance at the joint
• Meets ASME B18.2.1 dimensional standard for inch hex cap screws
• Uncoated finish suitable for assemblies requiring secondary coating or where bare steel is specified
• Pack of 100 for stocking service vehicles, shop bins, and maintenance inventory

Compatibility

Designed as a standard inch-series hex head cap screw for use with 5/16-18 UNC tapped holes, nuts, and threaded inserts in steel, iron, and aluminum assemblies conforming to ASME B18.2.1 specifications.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using a standard hex wrench or socket set. De-energize and lock out any equipment before replacing fasteners on live machinery per applicable OSHA lockout/tagout procedures. Do not mix Grade 8 fasteners with lower-grade nuts or threaded inserts that are not rated for the corresponding load. Apply torque values per the applicable engineering specification or fastener manufacturer torque chart for the joint material and lubrication condition.