Value Collection C89511 5/16-18 X 5-1/2 in Grade 8 Hex Cap Screw

Product Description

The Value Collection C89511 is a Grade 8 steel hex head cap screw with a 5/16-18 UNC thread and a 5-1/2 inch length under head. It features a zinc yellow dichromate finish that provides corrosion resistance in demanding shop and field environments. The screw is partially threaded, conforming to ASME B18.2.1 and SAE J429 standards. This fastener is suited for high-strength bolted assemblies where a recognized grade standard is required. Sold in a package of 25, it is a practical option for mechanics, millwrights, maintenance technicians, and other trades that work with inch-series hardware.

This screw is appropriate for structural and mechanical fastening applications in industrial, commercial, and trade settings. The 5/16-18 UNC thread is a standard coarse-thread size widely used in steel fabrications, equipment mounting, machinery frames, and general mechanical assemblies. The partial thread design allows for a smooth shank section, which is preferred in applications requiring a clamp load across a joint interface rather than threading into a shallow depth.

Key Features

• Grade 8 steel construction meets SAE J429 and ASME B18.2.1 standards for high-strength fastening
• 5/16-18 UNC coarse thread for broad compatibility with standard inch-series tapped holes and nuts
• 5-1/2 inch length under head accommodates thicker stack-ups and longer grip lengths
• Partial thread design provides a full shank section for shear load and joint clamping applications
• Zinc yellow dichromate finish adds corrosion resistance in moderate service environments
• Package of 25 reduces per-unit handling for repetitive assembly or stocking purposes

Compatibility

Designed for use with standard 5/16-18 UNC hex nuts, heavy hex nuts, and tapped holes conforming to inch-series thread standards in steel and compatible substrates.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using standard hex wrenches or sockets sized for a 5/16-18 hex head fastener. De-energize, depressurize, or lock out any equipment before fastening or removing hardware in live mechanical or electrical assemblies. Grade 8 fasteners should be torqued using a calibrated torque wrench to the value specified in the applicable equipment service manual or engineering specification. Do not substitute Grade 8 hardware with lower-grade fasteners in structural or high-load joints.