Value Collection 721231PR Flat Socket Cap Screw 3/8-24

Product Description

The VALUE COLLECTION 721231PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. The 82-degree flat head seats into a matching countersunk hole, keeping the fastener face level with or below the workpiece surface. Driven by a 7/32-inch hex socket, it is manufactured from alloy steel with a black oxide finish for moderate corrosion resistance. The 3/8-24 UNF thread is partially threaded over the 2-3/4-inch overall length, providing a grip length suited for clamping two or more components together. Machinists, maintenance technicians, and fabricators typically install this screw in precision assemblies where a protruding head is not acceptable.

This screw is suited for use in mechanical assemblies, tooling fixtures, machine frames, and structural joints where a countersunk fastener is required. The 3/8-24 UNF (Unified National Fine) thread pitch is common in high-strength or vibration-prone applications where fine threads provide better clamp load retention. The black oxide finish is appropriate for indoor or lightly oiled environments. It conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 7/32-inch hex socket drive for standard Allen key or hex bit tools
• 3/8-24 UNF partially threaded shank over 2-3/4-inch overall length
• Alloy steel construction meets ASTM F835 and ASME/ANSI B18.3 standards
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Inch measurement system; overall length measurement convention

Compatibility

Designed as a standard inch-series flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835, suitable for use in any application accepting a 3/8-24 UNF countersunk hex socket fastener of 2-3/4-inch overall length.

Installation Notes

Installation requires a 7/32-inch hex key or hex socket bit torqued to the specification appropriate for the grade and joint material. Power down or de-energize any equipment before fastener service. Ensure the mating countersink is machined to an 82-degree included angle to achieve full head seating. Do not overtighten in soft or tapped through-holes; verify thread engagement length meets design requirements before final torque.