Value Collection 211121PR Flat Socket Cap Screw 1/4-28 X 3/8 in

Product Description

The VALUE COLLECTION 211121PR is a flat socket cap screw designed for flush or countersunk fastening applications in precision assemblies. Manufactured from alloy steel with a black oxide finish, this screw features an 82-degree flat head profile and a 5/32-inch hex socket drive. The 1/4-28 UNF thread designation indicates a unified fine-thread standard, offering strong thread engagement in tapped holes. At 3/8 inches in overall length and fully threaded, it is well suited for securing components where a low-profile head and a clean, finished appearance are required.

This screw is commonly used in machine tooling, jigs, fixtures, and mechanical assemblies where a countersunk fastener is necessary to keep surfaces flush. The black oxide finish provides moderate corrosion resistance and reduces light reflection, making it a practical choice in industrial, tooling, and manufacturing environments. Installation is performed by machinists, assemblers, and maintenance technicians using a 5/32-inch hex key or Allen driver.

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 standard Allen keys
• 1/4-28 UNF fully threaded shank for maximum thread engagement across the full 3/8-inch length
• Alloy steel construction for high tensile strength in demanding fastening applications
• Black oxide finish for moderate corrosion resistance and low-reflectance appearance
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard fastener for applications requiring a 1/4-28 UNF countersunk socket cap screw with an 82-degree flat head profile, conforming to ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation is performed using a 5/32-inch hex key or Allen driver seated fully in the socket to prevent cam-out and fastener damage. Ensure the mating countersink is machined to an 82-degree included angle to achieve proper head seating and flush surface contact. De-energize and lock out any equipment before servicing fasteners in live assemblies. Follow applicable torque guidelines per ASME B18.3 for alloy steel socket cap screws of this thread size.