Value Collection 721018PR Flat Socket Cap Screw 2-56

Product Description

The VALUE COLLECTION 721018PR is a flat socket cap screw designed for precision fastening applications where a flush or countersunk profile is required. This screw features a 2-56 UNC thread and measures 7/8 inches in overall length. Constructed from alloy steel with a black oxide finish, it provides corrosion resistance suitable for general industrial and mechanical assembly work. The 82-degree flat head seats flush with the mating surface when installed in a properly chamfered counterbore. Drive engagement is through a hex socket, requiring an appropriately sized hex key or Allen driver for installation and removal.

This fastener is suited for use in precision mechanical assemblies, instrument enclosures, light-duty structural connections, and electronic or electromechanical equipment where low-profile, flush-mount fastening is needed. The fine 2-56 thread size makes it common in small-format assemblies including fixtures, jigs, tooling plates, and device housings. The black oxide finish provides mild corrosion inhibition and reduces light reflection, making it appropriate for both industrial and optical or instrumentation environments. Sold in minimum order quantities of 100 units.

Key Features

• 82-degree flat head seats flush when countersunk correctly, eliminating protrusion above the mating surface
• Hex socket drive for high torque application in confined spaces
• Alloy steel construction provides strength appropriate for small-fastener assemblies
• Black oxide finish for mild corrosion resistance and low-reflectivity appearance
• Partially threaded shank for positive clamping force in through-hole and blind applications
• Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard UNC 2-56 flat socket cap screw for use in any application requiring an 82-degree countersunk hex-socket fastener per ASME/ANSI B18.3.

Installation Notes

Installation is typically performed by a machinist, assembler, or maintenance technician using a calibrated hex key or Allen driver sized for the socket drive. The mating part must be drilled and countersunk to the correct 82-degree angle and diameter to achieve proper flush seating. Power down all equipment and relieve any mechanical tension before replacing fasteners in live assemblies. Do not exceed the rated drive engagement depth, as stripping the socket in small-format alloy steel screws is the primary failure mode during over-torquing.