Value Collection 721310BR Flat Socket Cap Screw 7/8-9

Product Description

The VALUE COLLECTION 721310BR is a flat socket cap screw designed for applications requiring a low-profile, flush-mount fastener with high tensile strength. Manufactured from alloy steel with a black oxide finish, this screw features a 9/16-inch hex socket drive and an 82-degree flat head that seats flush with or below the mating surface. It measures 4.5 inches in overall length on a 7/8-9 UNC thread and is partially threaded along the shank. Machinists, millwrights, and maintenance technicians reach for this fastener when a recessed head and clean surface finish are required in structural or mechanical assemblies.

This fastener is suited for use in machine tooling, jig and fixture construction, equipment mounting, and general industrial fabrication where a countersunk socket-drive screw is specified. The black oxide coating provides mild corrosion resistance and reduces light reflection, making it a practical choice in both shop and field environments. The partial threading allows for precise shoulder engagement in clearance-hole applications, which is common in fixture and die work.

Key Features

• 82-degree flat head seats flush with the mating surface for low-profile installations
• 9/16-inch hex socket drive for reliable torque transfer with standard Allen keys or socket drivers
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish offers mild corrosion resistance and a non-reflective appearance
• Partially threaded shank allows shoulder engagement in clearance-hole and fixture applications
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for any application specifying a 7/8-9 UNC flat socket cap screw per ASME/ANSI B18.3 or ASTM F835.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a calibrated hex key or socket driver sized to 9/16 inch. Ensure the mating countersink is machined to an 82-degree included angle before installation. Always verify thread engagement depth and confirm the fastener is not used in applications exceeding the alloy steel grade load limits. Torque to values specified in the applicable engineering drawing or fastener standard for the given thread size and joint material.