Value Collection 721317BR Flat Socket Cap Screw 1-8x2-1/4

Product Description

The VALUE COLLECTION 721317BR 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 5/8-inch hex socket. The screw is fully threaded, sized at 1-8 UNC x 2-1/4 inches overall length, and constructed from alloy steel with a black oxide finish. The black oxide coating provides mild corrosion resistance and reduces light reflection. This fastener meets ASME/ANSI B18.3 and ASTM F835 standards, making it suitable for precision mechanical assemblies where dimensional consistency and strength are required. Machinists, millwrights, and maintenance technicians commonly install this type of fastener.

This flat socket cap screw is used in applications where the screw head must sit flush with or below the surface of the workpiece. Typical install scenarios include machine frames, fixtures, tooling plates, guards, and structural assemblies where a low-profile head is necessary to avoid interference with mating parts or moving components. Its fully threaded shank and UNC thread form make it compatible with standard tapped holes in steel, aluminum, and similar materials common in industrial and manufacturing environments.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 5/8-inch hex socket drive for high torque transfer with standard hex keys or socket tooling
• Fully threaded 1-8 UNC shank across the 2-1/4-inch overall length
• Alloy steel construction for high tensile strength in demanding applications
• Black oxide finish for mild corrosion resistance and low-glare appearance
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed for use in standard 1-8 UNC tapped holes requiring a countersunk flat-head fastener. Suitable as a direct replacement or new installation in machine fixtures, tooling, and structural assemblies that conform to ASME/ANSI B18.3 dimensional standards.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 5/8-inch hex key or socket driver. Ensure the mating tapped hole is clean, properly sized to 1-8 UNC, and that the countersink angle matches the 82-degree flat head geometry before installation. De-energize and lock out any machinery before installing or removing fasteners in live equipment per applicable safety procedures. Do not exceed the torque capacity of the alloy steel fastener or the material of the mating component.