Value Collection 31128CH2 Hex Head Cap Screw 5/16-18 X 8 in

Product Description

The VALUE COLLECTION 31128CH2 is a partially threaded hex head cap screw designed for general fastening applications across industrial, mechanical, and structural assemblies. Manufactured from Grade 2 steel with a zinc-plated finish, this fastener measures 5/16-18 thread size with an 8-inch length under the head. The Unified National Coarse (UNC) thread form provides reliable engagement in standard tapped holes and nuts. It is installed using a 1/2-inch hex key or wrench and is suited for use by maintenance technicians, millwrights, plumbers, and general contractors who require a cost-effective, code-compliant fastener for moderate-load applications.

This cap screw is appropriate for residential, commercial, and light industrial settings where a zinc-plated steel fastener meets the corrosion-resistance and strength requirements of the job. The Grade 2 designation makes it suitable for low-to-moderate tensile load applications such as equipment mounting, structural brackets, pipe supports, and general mechanical assemblies. The partial threading allows for a smooth shank section near the head, which is useful in joints requiring a clamping grip rather than full-thread engagement throughout the fastener body.

Key Features

• 5/16-18 UNC thread form for compatibility with standard coarse-thread nuts and tapped holes
• 8-inch length under head with partial threading for shank-grip clamping joints
• Grade 2 steel construction meets ASME B18.2.1 and SAE J429 standards
• Zinc-plated finish provides baseline corrosion resistance in dry to mildly humid environments
• 1/2-inch hex drive for installation with standard wrenches or sockets

Compatibility

Designed for use with standard 5/16-18 UNC coarse-thread nuts, washers, and tapped holes conforming to inch-measurement fastener standards.

Installation Notes

Installation does not require special licensing but should follow applicable mechanical and structural codes for the application. Power down or de-energize any equipment before fastening components in electrical or mechanical assemblies. Use a properly sized 1/2-inch wrench or socket to avoid rounding the hex head. Do not exceed the rated tensile and shear load limits for Grade 2 fasteners in high-stress or safety-critical structural connections.