Value Collection 721280BR Flat Socket Cap Screw 5/8-18

Product Description

The VALUE COLLECTION 721280BR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head with a 3/8-inch hex socket drive and a 5/8-18 UNF thread form, making it compatible with fine-thread tapped holes in precision assemblies. The alloy steel construction and black oxide finish provide strength and a degree of corrosion resistance in dry or lightly oiled environments. Fully threaded along its 2-1/2-inch overall length, this screw is suited for through-hole and deep-thread fastening tasks. Machinists, millwrights, and maintenance technicians commonly specify this fastener where a standard hex cap screw head would interfere with mating components.

This screw is used in mechanical assemblies, fixtures, dies, and machinery where a low-profile countersunk head is required. The 5/8-18 UNF thread designation suits applications that demand finer thread engagement and greater tensile load distribution compared to coarse-thread variants. It is appropriate for both original equipment fabrication and maintenance replacement work in industrial and manufacturing environments. The fully threaded shank maximizes thread engagement across the full fastener length, which is particularly useful in shallow-boss or thin-plate applications.

Key Features

• 82-degree flat head profile allows flush or countersunk installation in mating surfaces
• 3/8-inch hex socket drive for use with standard Allen keys or hex bit drivers
• 5/8-18 UNF thread form for fine-thread applications requiring tight engagement
• Fully threaded over the 2-1/2-inch overall length for maximum thread engagement
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish provides a low-reflectance appearance and mild corrosion resistance in non-exposed environments

Compatibility

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

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/8-inch hex key or socket bit driver. Ensure the mating hole is properly countersunk to 82 degrees and the thread is clean and free of debris before driving the fastener. Do not exceed the rated drive torque for the fastener size, and avoid over-torquing, which can strip the hex socket or yield the shank. Black oxide finish does not replace lubrication in high-load joints; apply an appropriate thread lubricant or anti-seize compound as required by the application.