Value Collection 721276BR Flat Socket Cap Screw 5/8-18

Product Description

The VALUE COLLECTION 721276BR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features a hex socket drive and is manufactured from alloy steel with a black oxide finish for corrosion resistance in moderate environments. The 5/8-18 UNF thread and 1-1/2 inch overall length make it well-suited for precision assemblies where a low-profile head and reliable clamping force are required. The screw is fully threaded along its length, providing maximum thread engagement. Machinists, millwrights, and mechanical contractors typically install this fastener in equipment fabrication and maintenance applications.

This flat socket cap screw is used in industrial and mechanical assemblies where a countersunk head is needed to sit flush with or below the mating surface. It conforms to ASME/ANSI B18.3 and ASTM F835 standards, making it appropriate for general machine assembly, jig and fixture work, and equipment maintenance in manufacturing or trade environments. The fine 18 TPI UNF thread pitch offers tighter thread engagement and is commonly selected where vibration resistance or precise adjustment is important.

Key Features

• Flat head profile seats flush in countersunk holes to eliminate protrusion
• 3/8 inch hex socket drive for use with standard hex keys or bit drivers
• 5/8-18 UNF fine thread for improved vibration resistance and precise clamping
• Fully threaded for maximum thread engagement across the full 1-1/2 inch length
• Alloy steel construction with black oxide finish for surface protection
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-stock fastener for mechanical assemblies requiring a 5/8-18 UNF flat socket cap screw per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/8 inch hex key or compatible socket bit. The mating hole should be properly countersunk to the correct angle to ensure full flat head seating before torquing. Always confirm thread compatibility with the tapped hole before installation to avoid cross-threading. De-energize or lock out any equipment per applicable LOTO procedures before accessing fastener locations in live machinery.