Value Collection 211123PR Flat Socket Cap Screw 1/4-28

Product Description

The VALUE COLLECTION 211123PR is a flat socket cap screw designed for flush or countersunk fastening applications in metal, plastic, and composite assemblies. It features an 82-degree flat head with a 5/32-inch hex socket drive, allowing installation with a standard hex key or Allen wrench. The 1/4-28 UNF thread is fully threaded along the 1/2-inch overall length, providing maximum thread engagement for thin-stock and close-tolerance joints. Manufactured from alloy steel with a black oxide finish, it offers solid mechanical strength and moderate corrosion resistance in controlled environments. Machinists, maintenance technicians, and assembly professionals are the typical installers.

This screw is suited for applications where a low-profile, recessed fastener head is required so that the fastener sits flush or below the surface of the workpiece. The fine 1/4-28 UNF thread pitch makes it appropriate for high-vibration environments and precision assemblies where controlled clamping force and minimal thread slippage are priorities. Typical use cases include machine tool fixtures, jigs, instrument enclosures, and mechanical subassemblies where surface clearance is limited and a clean finish is necessary.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME/ANSI B18.3
• 5/32-inch hex socket drive for precise torque application with a standard hex key
• 1/4-28 UNF fine thread for high vibration resistance and accurate clamping control
• Fully threaded 1/2-inch overall length maximizes engagement in thin or shallow holes
• Alloy steel construction meets ASTM F835 mechanical requirements
• Black oxide finish provides a clean, low-reflectance appearance with mild corrosion resistance

Compatibility

Designed as an OEM-style and general-purpose replacement or production fastener for applications requiring an 82-degree countersunk flat socket cap screw in 1/4-28 UNF thread. Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 5/32-inch hex key or T-handle driver. Ensure the mating countersink is machined to an 82-degree included angle to achieve proper head seating before applying final torque. Do not overdrive, as black oxide alloy steel screws can shear at the socket if excessive torque is applied without lubrication or proper hole preparation. Follow applicable ASME or facility torque standards for 1/4-28 fasteners when torque values are critical.