Value Collection 86646 Hex Socket Cap Screw 5/16-18 Unc 50-pack

Product Description

The VALUE COLLECTION 86646 is a hex socket cap screw intended for industrial and mechanical fastening applications. It features a 5/16-18 UNC thread size and a 4-inch length under head, with partial threading along the shank. The drive is an internal hex socket sized at 1/4 inch, requiring an Allen key or hex bit driver for installation. Manufactured from alloy steel with a black oxide coating, this fastener offers improved corrosion resistance and reduced light reflection compared to bare steel. It conforms to ANSI B18.3, ANSI B18.8.2, ANSI B2.2, and MS16555 standards. Each package contains 50 screws.

This screw is suited for machinery assembly, tooling fixtures, structural attachments, and general mechanical maintenance work. The partially threaded shank allows for clamping force between two mated components, making it a common choice when precise joint load distribution is needed. Typical installers include machinists, millwrights, maintenance technicians, and mechanical contractors working in industrial or commercial settings. The black oxide finish is appropriate for interior or low-moisture environments.

Key Features

• 5/16-18 UNC thread size with partial threading along the shank
• 4-inch length under head for deeper fastening reach
• 1/4-inch internal hex socket drive for Allen key or hex bit installation
• Alloy steel construction for high tensile strength
• Black oxide coating for corrosion resistance and low-glare finish
• Meets ANSI B18.3, ANSI B18.8.2, ANSI B2.2, and MS16555 fastener standards

Compatibility

Designed as a standard replacement or production fastener for any application requiring a 5/16-18 UNC hex socket cap screw with a 4-inch length under head and partial threading.

Installation Notes

Use a calibrated torque wrench with the appropriate 1/4-inch hex bit or Allen key to install these screws to the torque specification required by the assembly drawing or equipment manufacturer. De-energize or lock out any machinery before servicing fasteners on moving or pressurized components. Confirm thread engagement and mating material compatibility before final torque. Black oxide fasteners should not be relied upon as the sole corrosion protection in wet or outdoor environments without additional treatment.