Value Collection 211127PR Flat Socket Cap Screw 1/4-28

Product Description

The VALUE COLLECTION 211127PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 5/32-inch hex socket and is fully threaded along its 3/4-inch overall length. Manufactured from alloy steel with a black oxide finish, it delivers solid mechanical strength alongside moderate corrosion resistance. This fastener meets ASME/ANSI B18.3 and ASTM F835 standards. It is suited for use by machinists, millwrights, maintenance technicians, and other trade professionals working with precision assemblies or structural fixtures where a low-profile head is required.

This screw is appropriate for use in machine assemblies, jigs and fixtures, tooling plates, and general mechanical fabrication where a flush-mount fastener is needed. The 1/4-28 UNF thread pitch makes it a fine-thread fastener, offering improved thread engagement and resistance to loosening under vibration compared to coarse-thread equivalents. It is commonly used in light industrial, automotive, and mechanical maintenance settings. The black oxide finish blends well in applications where fastener visibility is a concern. Sold individually, with a minimum order quantity of 100 units.

Key Features

• 82-degree flat head seats flush in standard countersunk holes for a low-profile installation
• 5/32-inch hex socket drive for use with standard Allen or hex key sets
• 1/4-28 UNF fine-thread designation for improved vibration resistance and thread engagement
• Fully threaded along the entire 3/4-inch length for maximum fastening flexibility
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish provides mild corrosion protection and a dark, low-reflectance appearance

Compatibility

Designed as a standard inch-series flat socket cap screw compatible with any 1/4-28 UNF tapped hole requiring an 82-degree countersunk head per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed with a 5/32-inch hex key or Allen driver. Ensure the mating countersink is machined to an 82-degree included angle to achieve proper head seating and load distribution. Verify the tapped hole thread form is UNF before installation to avoid cross-threading. Always torque to values appropriate for the alloy steel grade and joint material, referencing published fastener torque tables for 1/4-28 UNF screws.