Value Collection 721162PR Flat Socket Cap Screw 1/4-28 X 3 in

Product Description

The VALUE COLLECTION 721162PR is a 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 features an 82-degree flat head driven by a 5/32-inch hex socket. The 1/4-28 UNF thread is partially threaded along a 3-inch overall length. It meets ASME/ANSI B18.3 and ASTM F835 standards. Machinists, maintenance technicians, and mechanical assemblers install this type of fastener where a low-profile head is required and a standard hex driver is already on hand.

This flat socket cap screw is suited for precision mechanical assemblies, machine frames, fixtures, and tooling where the screw head must sit flush with or below the mating surface. The fine 1/4-28 UNF thread pitch provides strong clamping force and resistance to vibration loosening, making it appropriate for applications in manufacturing, instrumentation, and industrial equipment maintenance. The black oxide finish offers mild corrosion resistance in light-duty indoor environments.

Key Features

• 82-degree flat head seats flush in countersunk holes for a low-profile installation
• 5/32-inch hex socket drive for standard allen key or hex bit tools
• 1/4-28 UNF fine thread for enhanced clamping force and vibration resistance
• Alloy steel construction for high tensile strength in mechanical assemblies
• Black oxide finish provides mild corrosion protection in indoor environments
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard-dimension flat socket cap screw per ASME/ANSI B18.3, compatible with any countersunk hole sized for a 1/4-28 UNF partially threaded fastener with an 82-degree head angle.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 5/32-inch hex key or socket bit. Ensure the mating hole is properly countersunk to 82 degrees before driving the fastener. Apply appropriate thread-locking compound or torque per assembly engineering specifications. Do not substitute a metric hex key, as improper fit can damage the socket drive.