Value Collection 721238PR Flat Socket Cap Screw 1/2-13

Product Description

The VALUE COLLECTION 721238PR is a 1/2-13 x 7/8-inch flat socket cap screw designed for countersunk fastening applications in metal fabrication, machinery assembly, and structural installations. It features an 82-degree flat head profile that sits flush with or below the mating surface when properly seated, eliminating protrusion in high-clearance or aesthetic-critical assemblies. The hex socket drive accepts a 5/16-inch hex key for high-torque installation in confined spaces. Manufactured from alloy steel with a black oxide finish, this screw delivers solid mechanical strength with moderate corrosion resistance. The fastener is fully threaded along its 7/8-inch length on a 1/2-13 UNC coarse thread form.

This flat socket cap screw is suited for general industrial, mechanical, and structural applications where a flush fastener profile is required. The UNC 1/2-13 thread is one of the most common coarse-thread sizes in inch-standard assemblies, making this screw a frequent choice for machine frames, jigs, fixtures, and equipment panels. It is installed by machinists, millwrights, and maintenance technicians working on inch-standard equipment. The black oxide finish provides a low-reflectance appearance and light surface protection appropriate for indoor and controlled-environment use.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME/ANSI B18.3
• 5/16-inch hex socket drive allows high-torque installation with a standard Allen key or hex bit
• Fully threaded 7/8-inch body maximizes thread engagement across the full length
• Alloy steel construction provides high tensile and shear strength for demanding assemblies
• Black oxide finish reduces surface reflectance and adds light corrosion resistance
• Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an inch-standard UNC replacement or new-installation fastener for any assembly requiring a 1/2-13 countersunk socket cap screw per ASME/ANSI B18.3 and ASTM F835 specifications.

Installation Notes

Installation is performed with a 5/16-inch hex key or hex socket bit driver. Power down or de-energize any equipment before fastener replacement in mechanical assemblies. A properly sized 82-degree countersink must be present in the mating material for the flat head to seat flush. Apply thread-locking compound or torque to specification per the equipment manufacturer's guidelines and applicable ASME standards.