Value Collection 721189PR Flat Socket Cap Screw 5/16-24

Product Description

The VALUE COLLECTION 721189PR is a flat socket cap screw designed for precision fastening applications that require a flush or countersunk installation profile. Featuring an 82-degree flat head and a 3/16-inch hex socket drive, this fastener accepts a standard hex key for reliable torque transfer. It is manufactured from alloy steel with a black oxide finish that provides moderate corrosion resistance and reduces light reflection. The 5/16-24 UNF thread specification indicates a fine-thread pitch suited to applications demanding greater thread engagement and vibration resistance. This screw measures 2.5 inches in overall length and is partially threaded. It is used by machinists, millwrights, and mechanical assemblers across industrial and manufacturing environments.

This fastener is suited for use in machine assemblies, jigs and fixtures, tooling plates, and structural components where a countersunk, low-profile head is required. The fine thread series makes it appropriate for metal-to-metal connections where thread stripping resistance and precise clamping force are priorities. It is commonly installed in ferrous and high-strength base materials where a clean surface finish after installation is necessary. Partially threaded construction allows for clamping of stacked components with a shank section that passes through a clearance hole.

Key Features

• 82-degree flat head profile for flush countersunk installation
• 3/16-inch hex socket drive compatible with standard hex keys and bit drivers
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish for mild corrosion resistance and low-glare appearance
• 5/16-24 UNF fine-thread for tight thread engagement in metal assemblies
• Partially threaded shank allows controlled clamping across clearance holes
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-use flat socket cap screw for applications requiring a 5/16-24 UNF fine-thread, 82-degree countersunk fastener in alloy steel construction.

Installation Notes

Installation is typically performed by machinists or mechanical assemblers using a 3/16-inch hex key or socket driver. Ensure the mating countersink is machined to an 82-degree included angle to achieve full head seating. De-energize and lock out any equipment before installing or removing fasteners in live machinery per applicable OSHA and equipment-specific procedures. Do not substitute a coarse-thread fastener in a fine-thread tapped hole.