Value Collection 581425PR Hex Socket Cap Screw 5/16-18 Unc

Product Description

The VALUE COLLECTION 581425PR is a hex socket cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. Threaded 5/16-18 UNC and measuring 1-3/8 inches under the head with full threading throughout, this fastener delivers reliable clamping force in tight-clearance installations where a standard hex head wrench cannot reach. The 1/4-inch hex drive accepts a standard Allen key or hex bit. Manufactured from alloy steel with a black oxide finish, the 581425PR provides good corrosion resistance in dry and mildly humid environments while maintaining the high tensile strength expected of ASTM A574-grade socket cap screws.

This screw is suited for machinery assembly, fixture building, tooling, and general mechanical maintenance work. Fully threaded along its entire shank length, it performs well in through-hole and insert applications where maximum thread engagement is required. The black oxide finish reduces light reflection and provides a degree of surface protection without adding significant dimensional build-up. This fastener is typically installed by machinists, millwrights, maintenance technicians, and mechanical contractors working on metal fabrication and equipment assembly.

Key Features

• 5/16-18 UNC thread size for broad compatibility with standard inch-series hardware
• 1-3/8 inch length under head, fully threaded for maximum engagement
• 1/4-inch hex socket drive for use with Allen keys or hex bit drivers
• Alloy steel construction meeting ASTM A574 and ASME/ANSI B18.3 standards
• Black oxide finish for surface protection and low-reflectivity appearance

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 compliant hex socket cap screw for use in any application requiring a 5/16-18 UNC fully threaded fastener with a 1/4-inch hex drive.

Installation Notes

Install using a 1/4-inch hex key or appropriate hex bit driver. Ensure mating threads are clean and free of debris before assembly. Apply thread lubricant or thread-locking compound as required by the application specification. Do not exceed the rated torque for 5/16-18 alloy steel fasteners as specified in the relevant ASME or equipment manufacturer documentation.