Value Collection 721274BR Flat Socket Cap Screw 5/8-18

Product Description

The VALUE COLLECTION 721274BR is a flat socket cap screw designed for applications requiring a flush or countersunk head profile. Machined from alloy steel with a black oxide finish, it provides moderate corrosion resistance and reduces light reflection in low-visibility or aesthetic-sensitive installations. The 5/8-18 UNF thread pitch indicates a fine-thread designation, which provides greater holding strength and resistance to loosening under vibration compared to coarse-thread variants. Drive engagement is through a 3/8-inch hex socket. This fastener is fully threaded across its 1-1/4-inch overall length. It is installed by maintenance technicians, millwrights, and mechanical assemblers working on precision machinery, tooling, and structural assemblies.

This screw is suited for use in mechanical assemblies, fixtures, and machine components where the head must sit flush with or below the mating surface. The fine UNF thread series makes it appropriate for applications with thinner-walled material or where precise torque control is required. Fully threaded construction allows engagement across the entire grip length, making it practical for through-hole and short-depth blind-hole applications in metal fabrication and industrial maintenance environments.

Key Features

• Flat head profile allows flush or countersunk installation in mating surfaces
• 5/8-18 UNF fine-thread designation for improved vibration resistance and torque sensitivity
• Fully threaded 1-1/4-inch overall length maximizes thread engagement
• 3/8-inch hex socket drive for standard hex key or socket wrench installation
• Alloy steel construction for high tensile strength in demanding mechanical applications
• Black oxide finish provides mild corrosion resistance and low-glare surface appearance

Compatibility

Designed as an OEM-style or replacement flat socket cap screw for mechanical assemblies, fixtures, and machine components requiring a 5/8-18 UNF fully threaded fastener conforming to ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation is performed using a 3/8-inch hex key or socket driver. Ensure the mating hole is properly countersunk to the correct angle before installing to achieve a flush seating surface. De-energize or lock out any equipment before fastener replacement in powered assemblies per applicable OSHA lockout/tagout procedures. Do not substitute a coarse-thread fastener in a fine-thread hole, as thread damage and loss of clamp load will result.