Value Collection 581440PR Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 581440PR is a hex socket cap screw designed for high-strength fastening applications across mechanical, industrial, and trade installations. Threaded to a 5/16-18 UNC specification and measuring 7 inches in length under the head, this fastener is partially threaded and driven with a 1/4-inch hex key. Constructed from alloy steel with a black oxide finish coating, it offers solid corrosion resistance and surface hardness suited to demanding service environments. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional and mechanical compliance for structural and equipment fastening.

This cap screw is appropriate for use in general mechanical assemblies, equipment mounting, jig and fixture fabrication, and structural fastening in both residential and commercial trade settings. The partial threading allows the unthreaded shank to serve as a precision shoulder in close-tolerance bores. Machinists, millwrights, pipefitters, and general contractors working with metal-to-metal joints commonly specify this type of fastener where socket-drive access is limited or a flush-head profile is required.

Key Features

• 5/16-18 UNC thread for compatibility with standard inch-series tapped holes
• 7-inch length under head accommodates deep fastening applications
• Partially threaded shank provides a precision shoulder for close-tolerance assemblies
• Alloy steel construction delivers high tensile strength per ASTM A574
• Black oxide finish coating provides moderate corrosion resistance and reduces light reflection
• 1/4-inch hex socket drive for use with standard Allen keys or hex bit sockets

Compatibility

Designed as a standard inch-series hex socket cap screw for use in any application requiring a 5/16-18 UNC tapped hole and conforming to ASME/ANSI B18.3 dimensional standards.

Installation Notes

Installation is performed with a 1/4-inch hex key or socket bit driver. Ensure the mating tapped hole is clean and free of debris before driving the screw to prevent thread damage. Power down or de-energize any associated equipment before fastener service on live machinery. Do not exceed the rated torque specifications published in ASME/ANSI B18.3 for the applicable property class.