Value Collection 721082PR Flat Socket Cap Screw 6-40

Product Description

The VALUE COLLECTION 721082PR 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 5/64-inch hex socket and is fully threaded along its 3/4-inch overall length. The screw is manufactured from alloy steel with a black oxide finish, which provides mild corrosion resistance and reduces light reflection in finished assemblies. This fastener conforms to ASME/ANSI B18.3 and ASTM F835 standards. Machinists, maintenance technicians, and assembly professionals install this type of screw where a low-profile head must sit flush with or below a mating surface.

This screw is suited for precision mechanical assemblies, tooling fixtures, machine components, and general industrial applications where a countersunk fastener is required. The 6-40 UNF thread designation makes it appropriate for fine-thread applications demanding tighter thread engagement and greater resistance to loosening under vibration. It is sized for use in metal components machined to accept an 82-degree countersink. The black oxide finish is commonly selected in applications where a low-visibility or non-reflective fastener surface is preferred.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 5/64-inch hex socket drive for precise torque application in tight clearances
• Fully threaded 3/4-inch overall length for maximum thread engagement
• 6-40 UNF fine thread for improved vibration resistance over coarse-thread equivalents
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 standards
• Black oxide finish for mild corrosion resistance and reduced surface reflectivity

Compatibility

Designed as a standard inch-series flat socket cap screw compatible with any application specifying a 6-40 UNF fully threaded fastener with an 82-degree countersink and 5/64-inch hex socket drive, per ASME/ANSI B18.3.

Installation Notes

Installation is performed by machinists or maintenance technicians using a calibrated 5/64-inch hex key or socket driver. The mating component must be machined with an 82-degree countersink to achieve a proper flush seating surface. Power down any machinery and secure all moving components before fastener replacement or installation. Avoid cross-threading by engaging the fastener by hand before applying torque.