Value Collection 015221PR Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 015221PR is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and equipment fabrication. Featuring a 5/16-18 UNC thread size and a 3-1/4 inch length under head, this fastener is driven with a 1/4 inch hex key. The alloy steel construction with a black oxide finish provides solid mechanical strength and moderate corrosion resistance in controlled environments. It meets ASME/ANSI B18.3, ASTM A574, and IFI 124 standards, making it appropriate for applications that call for a recognized fastener specification. Machinists, maintenance technicians, and industrial assemblers are the primary installers.

This cap screw is suited for use in ferrous and non-ferrous assemblies requiring a recessed-drive, low-profile head fastener. The partial threading allows the unthreaded shank to align components before engagement, which is useful in jig and fixture work, machine frames, and general mechanical assemblies. It is a standard UNC fastener appropriate for both production and maintenance environments across industrial, HVAC equipment, and mechanical trades.

Key Features

• 5/16-18 UNC thread for wide compatibility with standard tapped holes
• 3-1/4 inch length under head accommodates deeper fastening applications
• Partially threaded shank aids component alignment before thread engagement
• 1/4 inch hex drive for use with standard hex keys and Allen wrenches
• Alloy steel construction delivers high tensile and shear strength
• Black oxide finish provides mild corrosion resistance and reduced light reflection
• Meets ASME/ANSI B18.3, ASTM A574, and IFI 124 fastener standards

Compatibility

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

Installation Notes

Installation requires a 1/4 inch hex key or Allen driver in good condition; worn drivers can strip the socket recess. Ensure the mating tapped hole is clean, properly sized to 5/16-18 UNC, and free of debris before driving. Power down or de-energize any equipment before accessing fastened assemblies. Apply thread lubricant or thread-locking compound only where specified by the equipment manufacturer.