Value Collection 211177PR Flat Socket Cap Screw 5/16-24

Product Description

The VALUE COLLECTION 211177PR is a flat socket cap screw designed for flush or countersunk fastening applications in metal assemblies, mechanical components, and precision fixtures. The 82-degree flat head seats flush with the work surface when installed in a properly prepared countersunk hole. Driven by a 3/16-inch hex socket, it delivers high torque transfer in tight spaces where a conventional head fastener will not fit. Made from alloy steel with a black oxide finish, this fastener offers improved corrosion resistance compared to uncoated steel and is suited for interior or protected-environment use. Machinists, maintenance mechanics, and fabricators are the typical installers.

This screw is intended for inch-system applications requiring a fine-thread 5/16-24 UNF fastener at 1/2-inch overall length. The fully threaded shank provides maximum thread engagement across the full grip length, making it well suited for thin-material or close-tolerance assemblies. Common applications include machine frames, jigs, tooling plates, motor mounts, and general industrial equipment where a low-profile fastened joint is required. The black oxide finish blends with dark or anodized surfaces and reduces light reflection in precision optical or electronic enclosures.

Key Features

• 82-degree flat head seats flush with the work surface in a standard countersunk hole
• 3/16-inch hex socket drive for high torque in confined spaces
• 5/16-24 UNF fine thread for precise clamping and vibration resistance
• Fully threaded shank maximizes thread engagement in thin or short-grip applications
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish provides mild corrosion resistance and low-reflectance appearance

Compatibility

Designed as a standard inch-series flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835, compatible with any 5/16-24 UNF tapped hole requiring an 82-degree countersunk flat-head fastener.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance mechanics using a 3/16-inch hex key or Allen driver. The mating hole must be countersunk to 82 degrees for the head to seat flush. Verify thread engagement depth before torquing and ensure the tapped hole is free of chips or debris. Do not substitute a metric or UNC tap for this UNF thread specification, as thread mismatch will cause fastener failure.