Value Collection 821275MSC Smooth Flange Bolt 5/8-11 Unc

Product Description

The VALUE COLLECTION 821275MSC is a smooth flange bolt designed for high-strength fastening applications in mechanical, structural, and industrial assemblies. It features a 5/8-11 UNC thread pattern, a 3-1/4 inch length under head, and 1-1/2 inches of partial threading. The hex drive head is paired with a smooth flange measuring 1-21/64 inches (1.3281 inches) in diameter, which distributes clamping load over a wider bearing surface without the need for a separate washer. Manufactured from Grade 8 alloy steel with a phosphate and oil finish, this bolt meets IFI 111 and SAE J429 standards. It is installed by mechanics, millwrights, and industrial maintenance technicians.

This bolt is suited for high-load fastening in equipment frames, heavy machinery, automotive drivetrain components, and structural steel connections where a UNC thread form and Grade 8 strength rating are specified. The smooth flange face makes it appropriate for applications where a serrated flange could damage the mating surface or where torque distribution across a wider contact area is required. It is used in both OEM production assembly and field maintenance repair work.

Key Features

• 5/8-11 UNC thread for compatibility with standard inch-series tapped holes and nuts
• Grade 8 alloy steel construction for high tensile and proof load capacity
• Smooth flange at 1-21/64 inches diameter provides integrated washer-bearing surface
• Partially threaded shank with 1-1/2 inches of thread length, leaving a smooth grip section
• Phosphate and oil finish for corrosion resistance and lubricity during installation
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as a standard inch-series smooth flange bolt for use with 5/8-11 UNC tapped holes or hex nuts in high-strength industrial, mechanical, and structural fastening applications.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using a standard hex wrench or socket driver. Always verify that the mating tapped hole or nut is also rated for Grade 8 loading before torquing. Follow applicable torque specifications from your engineering drawings or fastener torque tables for 5/8-11 UNC Grade 8 fasteners. Inspect threads for damage before installation and do not use the fastener if threads are galled or corroded.