Value Collection 721172PR Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 721172PR is a flat socket cap screw designed for flush or countersunk fastening applications in mechanical assemblies. It features an 82-degree flat head with a 3/16-inch hex socket drive, allowing installation with a standard hex key. The fastener is partially threaded with a 5/16-18 UNC thread form and measures 2.75 inches in overall length. Manufactured from alloy steel with a black oxide finish, it offers solid mechanical strength and moderate corrosion resistance in dry or lightly oiled environments. Installation and maintenance technicians working on machinery, fixtures, and structural assemblies rely on this screw where a flush seating surface is required.

This screw is suited for use in industrial equipment, machine frames, tooling fixtures, and mechanical assemblies that require a countersunk fastening point. The 5/16-18 UNC thread standard makes it compatible with tapped holes conforming to ASME/ANSI B18.3 and ASTM F835 specifications. The black oxide finish is commonly selected for interior or enclosed applications where a low-reflectance, non-galling surface is preferred. Machinists, maintenance mechanics, and assembly technicians are the typical installers.

Key Features

• 82-degree flat head seats flush in standard countersunk holes
• 3/16-inch hex socket drive for precise torque application with a hex key
• 5/16-18 UNC partially threaded shank for clamping force over longer grip lengths
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish reduces light reflection and provides mild corrosion resistance
• Overall length measured end-to-end at 2.75 inches

Compatibility

Designed as an OEM-style replacement or service fastener for mechanical assemblies requiring a 5/16-18 UNC flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation should be performed by qualified mechanics or assembly technicians using a properly sized 3/16-inch hex key or hex bit driver. Ensure the receiving tapped hole is clean and free of debris before driving the screw. Do not exceed the torque capacity of the alloy steel fastener, and avoid using impact drivers that may damage the hex socket or over-stress the threads. Partially threaded screws require adequate thread engagement in the tapped hole to achieve rated clamping force.