Value Collection 721142PR Flat Socket Cap Screw 1/4-20

Product Description

The VALUE COLLECTION 721142PR is a flat socket cap screw designed for flush or countersunk fastening applications in metal assemblies. This screw features a 1/4-20 UNC thread with an overall length of 1-1/8 inches and is fully threaded along that length. The 82-degree flat head seats flush with the workpiece surface when installed in a properly chamfered hole. Drive engagement is via a 5/32-inch hex socket. Constructed from alloy steel with a black oxide finish, it provides moderate corrosion resistance and is suited for interior and protected-environment mechanical assemblies. Licensed tradespeople and machine builders commonly specify this fastener type for compact, low-profile joint designs.

This fastener is used in mechanical, structural, and industrial assembly applications where a flush-mount screw head is required. The 82-degree flat head geometry conforms to ASME/ANSI B18.3 and ASTM F835 standards, making it appropriate for precision machine components, fixtures, tooling plates, and fabricated steel assemblies. The black oxide finish is typical for indoor or controlled-environment use where minimal surface corrosion protection is acceptable. This size is commonly found in light machinery, brackets, enclosures, and general fabrication work.

Key Features

• 82-degree flat head seats flush when installed in a matching countersunk hole
• 5/32-inch hex socket drive for standard Allen key or hex bit installation
• Fully threaded 1/4-20 UNC along the entire 1-1/8-inch length
• Alloy steel construction for high tensile strength in demanding assemblies
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 1/4-20 UNC flat socket cap screw for use in any application requiring an ASME/ANSI B18.3 or ASTM F835 compliant flush-mount fastener in alloy steel.

Installation Notes

Installation requires a properly sized 82-degree countersink in the mating material to achieve a flush seating surface. Use a calibrated 5/32-inch hex key or socket bit driver; do not use an undersized driver, as this risks rounding the socket. De-energize and lock out any equipment before fastener removal or replacement in live assemblies. Apply thread-locking compound or torque to specification per the assembly engineering drawing where vibration or dynamic loading is present.