Value Collection 721146PR Flat Socket Cap Screw 1/4-20

Product Description

The VALUE COLLECTION 721146PR is a flat socket cap screw designed for fastening applications that require a low-profile, countersunk head. It features a 1/4-20 UNC thread and measures 2.5 inches in overall length. The 82-degree flat head sits flush with or below the mating surface, eliminating protrusions in finished assemblies. Drive engagement is through a 5/32-inch hex socket. Constructed from alloy steel with a black oxide finish, this screw offers solid mechanical strength and moderate corrosion resistance for industrial and mechanical installations. Threading is partial, leaving a smooth shank section near the head for shear-load applications.

This screw is suited for use in machine assemblies, fixtures, tooling, and structural components where a flush-mount fastener is required. The 1/4-20 UNC thread is a common standard size found across general industrial, manufacturing, and maintenance environments. It is typically installed by machinists, maintenance technicians, and mechanical contractors. The black oxide finish makes it a practical choice for interior or low-moisture applications where appearance and mild rust resistance are both considerations.

Key Features

• 82-degree flat head profile for flush or countersunk installation
• 5/32-inch hex socket drive for standard Allen key or hex bit engagement
• 1/4-20 UNC thread on a 2.5-inch overall length
• Partial threading allows shank to carry shear loads
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish for low-reflectance appearance and mild corrosion resistance

Compatibility

Designed as an OEM-style replacement or general-use fastener compatible with any 1/4-20 UNC threaded hole requiring an 82-degree countersunk flat head and a 2.5-inch grip range.

Installation Notes

Installation requires a properly countersunk 82-degree seat to achieve correct head seating and clamp load. Use a calibrated 5/32-inch hex key or bit driver to torque the fastener; do not use worn or undersized drivers that may strip the socket. Ensure the receiving thread is clean and free of debris before installation. Power down or de-energize any equipment before accessing fastener locations in live mechanical or electrical assemblies.