Value Collection 211307PR Flat Socket Cap Screw 1/2-20

Product Description

The Value Collection 211307PR is a flat socket cap screw engineered for applications requiring a flush or countersunk fastener profile. Built from alloy steel with a black oxide finish, it delivers solid corrosion resistance and a clean, low-profile seating surface. The 82-degree flat head seats into standard countersunk holes, and the 5/16-inch hex socket drive provides reliable torque transfer without bit slip. At 3/4 inches overall length with full threading along the entire shank, this fastener suits tight-tolerance assemblies in mechanical, industrial, and fabrication environments. Installation is performed by machinists, millwrights, maintenance technicians, and general industrial trades.

This screw is suited for countersunk fastening applications where the fastener head must sit flush with or below the mating surface. The 1/2-20 UNF thread pitch makes it appropriate for fine-thread applications demanding higher thread engagement and vibration resistance compared to coarse-thread equivalents. Typical use cases include machine frames, jigs, fixtures, tooling plates, and precision mechanical assemblies. The black oxide finish reduces light reflection and provides mild surface protection in indoor environments.

Key Features

• 82-degree flat head seats flush in standard countersunk holes
• 5/16-inch hex socket drive for positive torque engagement
• 1/2-20 UNF fine-thread specification for high thread engagement
• Fully threaded shank along 3/4-inch overall length
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 standards
• Black oxide finish for mild corrosion resistance and low reflectivity

Compatibility

Designed as a standard replacement or service fastener for countersunk hex socket applications using 1/2-20 UNF fine-thread specifications per ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation is performed using a 5/16-inch hex key or socket driver; verify the driver is fully seated before applying torque to avoid rounding the socket. Power down or de-energize any associated equipment before fastener service. Countersunk hole geometry should conform to the 82-degree included angle to ensure proper head seating and load distribution. Thread engagement depth and clamping requirements should be verified against the assembly design specification.