Value Collection 721318BR Flat Socket Cap Screw

Product Description

The VALUE COLLECTION 721318BR is a flat socket cap screw designed for applications where a flush or countersunk fastener profile is required. It features an 82-degree flat head driven by a 5/8-inch hex socket and is fully threaded along its 2-1/2-inch overall length. The thread size is 1-8 UNC, machined from alloy steel and finished in black oxide for corrosion resistance and reduced light reflection. This screw meets ASME/ANSI B18.3 and ASTM F835 standards. It is installed by machinists, maintenance technicians, and fabricators working in industrial, mechanical, and structural assembly environments.

This flat socket cap screw is suited for use in machine assemblies, tooling fixtures, jigs, and mechanical enclosures where the fastener head must sit flush with or below the mating surface. The UNC thread form and alloy steel construction make it appropriate for high-load, precision-fit applications. The black oxide finish is commonly selected in applications where surface glare must be minimized or where a uniform dark appearance is preferred alongside other black oxide hardware.

Key Features

• 82-degree flat head sits flush with mating surface when installed in a properly countersunk hole
• 5/8-inch hex socket drive for use with standard hex keys or socket drivers
• Fully threaded 2-1/2-inch overall length for maximum thread engagement
• 1-8 UNC thread standard for broad compatibility with inch-system tapped holes
• Alloy steel construction for high tensile strength in demanding applications
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME/ANSI B18.3 and ASTM F835 dimensional and mechanical standards

Compatibility

Designed as an OEM-style and aftermarket replacement flat socket cap screw for inch-system assemblies requiring a 1-8 UNC, 2-1/2-inch fully threaded countersunk fastener conforming to ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation is performed by machinists or mechanical assemblers using a calibrated hex key or T-handle socket driver sized to 5/8 inch. The mating hole should be properly countersunk to 82 degrees before installation to ensure full head seating. Power down or de-energize any equipment before servicing assemblies containing this fastener. Do not exceed the rated torque range for the alloy steel grade and thread size per applicable industry references.