Value Collection 721261PR Flat Socket Cap Screw 5/8-11

Product Description

The VALUE COLLECTION 721261PR is a flat socket cap screw designed for flush or countersunk fastening applications in mechanical assemblies. The 82-degree flat head seats flush with or below the work surface, making it a common choice where a low-profile joint is required. The hex socket drive accepts a 3/8-inch hex key for installation and removal. Constructed from alloy steel with a black oxide finish, this fastener offers solid mechanical strength and moderate corrosion resistance in dry or lightly oiled environments. It is fully threaded at 5/8-11 UNC and measures 2-3/4 inches in overall length. Maintenance technicians, millwrights, and general contractors regularly install this screw type across a wide range of structural and mechanical applications.

This fastener fits countersunk hole patterns machined to ASME/ANSI B18.3 specifications and is manufactured to ASTM F835 standards. It is used in machinery frames, jigs, fixtures, structural brackets, and fabricated assemblies where a flush fastener surface is needed. The 5/8-11 UNC thread is a coarse-thread standard common in general industrial fabrication and heavy equipment maintenance. Installation is straightforward using standard hex key tooling in a pre-drilled and countersunk pilot hole.

Key Features

• 82-degree flat head for flush or below-surface installation in countersunk applications
• 3/8-inch hex socket drive for high-torque engagement with standard Allen keys
• Fully threaded 5/8-11 UNC coarse-thread profile for broad compatibility with standard nuts and tapped holes
• Alloy steel construction for high tensile and shear strength in demanding assemblies
• Black oxide finish provides moderate corrosion resistance and reduces light reflection in finished assemblies
• Manufactured to ASME/ANSI B18.3 and ASTM F835 standards

Compatibility

Designed as a standard ASME/ANSI B18.3 flat socket cap screw for use in countersunk holes with 5/8-11 UNC tapped threads or matching nuts across general industrial and mechanical fabrication applications.

Installation Notes

Install using a 3/8-inch hex key or Allen driver in a properly countersunk pilot hole machined to the 82-degree seat angle. Ensure the mating hole is tapped to 5/8-11 UNC before installation. De-energize or lock out any machinery before replacing fasteners in live equipment per applicable OSHA lockout/tagout procedures. Do not overtighten; follow the torque specifications published in ASME or the equipment manufacturer's service documentation for this thread size and grade.