Value Collection 721253PR Flat Socket Cap Screw 1/2-13 X 8 in

Product Description

The VALUE COLLECTION 721253PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 5/16-inch hex socket and is partially threaded along its 8-inch overall length with a 1/2-13 UNC thread size. Manufactured from alloy steel with a black oxide finish, this screw delivers high tensile strength and moderate corrosion resistance in a variety of mechanical and structural assemblies. Licensed tradespeople and maintenance professionals in manufacturing, industrial, and mechanical installation settings commonly specify this fastener where a low-profile head seating against a countersunk hole is required.

This flat socket cap screw is suited for industrial machinery, structural steel assemblies, jigs, fixtures, and heavy equipment where flush fastening is necessary. The partial threading configuration allows for precise clamping across thick material stacks without thread engagement through the full grip length. Conformance to ASME/ANSI B18.3 and ASTM F835 standards makes this screw appropriate for applications with defined fastener specifications in engineering drawings and maintenance documentation.

Key Features

• 82-degree flat head profile for flush countersunk installation
• 5/16-inch hex socket drive for high-torque engagement
• 1/2-13 UNC thread form per ASME/ANSI B18.3 and ASTM F835
• Partially threaded shank for secure clamping through thicker material stacks
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish adds mild corrosion resistance and reduces light reflection

Compatibility

Designed as a standard-dimension replacement or specification fastener for applications requiring a 1/2-13 UNC flat socket cap screw with an 8-inch overall length, conforming to ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using a properly sized 5/16-inch hex key or socket driver. Ensure the mating countersunk hole is machined to an 82-degree included angle to achieve proper head seating. Power down and de-energize any machinery before fastener service. Do not exceed the torque rating specified in the applicable engineering documentation for this thread size and material grade.