Value Collection 721308BR Flat Socket Cap Screw 7/8-9x4in

Product Description

The VALUE COLLECTION 721308BR is a flat socket cap screw designed for flush or countersunk fastening applications where a low-profile head is required. It features an 82-degree flat head with a 9/16-inch hex socket drive and measures 7/8-9 thread size by 4 inches in overall length. The screw is partially threaded and manufactured from alloy steel with a black oxide finish, which provides moderate corrosion resistance and a clean appearance. It is sized for heavy-duty mechanical assemblies and is installed by machinists, millwrights, and maintenance technicians working on equipment where standard cap screws would protrude above the mating surface.

This flat socket cap screw is suited for use in machine frames, tooling fixtures, structural assemblies, and industrial equipment requiring countersunk fasteners. The 7/8-9 UNC thread size is a common coarse-thread pitch used in general engineering and manufacturing applications. The partial threading allows for a shank section that can bear shear loads, making it appropriate for joints where alignment and load transfer are critical alongside clamping force.

Key Features

• 82-degree flat head profile for flush countersunk installation
• 9/16-inch hex socket drive for secure wrench engagement
• 7/8-9 UNC coarse thread, partially threaded for shear-load capability
• Alloy steel construction for high tensile strength
• Black oxide finish for mild corrosion resistance and reduced light reflection
• Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard UNC coarse-thread flat socket cap screw suitable for countersunk fastening applications in industrial machinery, tooling, and structural assemblies requiring a 7/8-9 threaded fastener.

Installation Notes

Installation requires a properly countersunk or flat-bottom bored hole machined to accommodate the 82-degree head angle. Use a calibrated hex key or socket driver sized for 9/16-inch hex drive to achieve proper seating. Torque to values appropriate for the alloy steel grade and joint material per applicable engineering specifications. De-energize and lock out any equipment before fastener removal or installation on live machinery.