Value Collection -36871-1 Flat Socket Cap Screw 1/4-28

Product Description

The VALUE COLLECTION -36871-1 is a 1/4-28 UNF flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. Manufactured from alloy steel with a black oxide finish, this screw offers solid mechanical strength and moderate corrosion resistance in interior and light-duty environments. The 82-degree flat head seats cleanly into countersunk holes, and the 5/32-inch hex socket drive allows precise torque application with standard hex keys. At 1/2 inch in overall length and fully threaded, this fastener is suited for through-hole and blind-hole assemblies where a clean surface finish is required after installation.

This flat socket cap screw is commonly used in machinery, fixtures, tooling plates, and fabricated assemblies across industrial, mechanical, and light manufacturing settings. The 1/4-28 fine thread provides tighter thread engagement per inch compared to coarse thread, making it a preferred choice when vibration resistance or precision clamping is important. Tradespeople, machinists, and maintenance technicians working with steel, aluminum, or similar substrates will find this fastener appropriate for panel mounting, equipment housings, and structural bracketing. Sold in packages of 25.

Key Features

• 82-degree flat head profile for flush countersunk installations
• 5/32-inch hex socket drive for standard Allen key or hex bit use
• 1/4-28 UNF fine thread for improved vibration resistance and precise clamping
• Fully threaded along the 1/2-inch overall length for maximum thread engagement
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish provides mild corrosion resistance and a low-reflectance appearance

Compatibility

Designed as a standard 1/4-28 UNF flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835, suitable for use in countersunk holes in metal, plastic, and composite assemblies where a flush fastener seating is required.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 5/32-inch hex key or hex drive bit. Ensure the mating countersink is machined to an 82-degree included angle for proper head seating. De-energize or lock out any equipment before fastener replacement in live machinery per applicable safety procedures. Avoid over-torquing, as alloy steel fasteners in soft substrates such as aluminum can strip the mating threads.