Value Collection 821291MSC Flange Bolt 5/8-11 Unc 6 in Grade 8

Product Description

The VALUE COLLECTION 821291MSC is a partially threaded smooth flange bolt engineered for high-strength fastening applications. It features a 5/8-11 UNC thread size with a 1.5-inch thread length and a 6-inch length under head. The integrated smooth flange measures 1-21/64 inches (1.3281 inches) in diameter, distributing clamping load across a wider bearing surface without requiring a separate washer. Constructed from Grade 8 alloy steel with a phosphate and oil finish, this bolt delivers superior tensile strength and corrosion resistance compared to standard low-carbon fasteners. It meets IFI 111 and SAE J429 standards, making it suitable for demanding structural and mechanical assembly work.

This flange bolt is commonly used in heavy equipment assembly, automotive drivetrain and suspension work, industrial machinery mounting, and structural steel connections where a high-strength, partially threaded fastener with a built-in bearing flange is required. The partial thread design allows the unthreaded shank to bear shear loads in close-tolerance applications. It is appropriate for both shop fabrication and field installation by mechanics, millwrights, and maintenance technicians working with inch-series fasteners.

Key Features

• 5/8-11 UNC thread size with 1.5-inch thread length for partial threading and shear-bearing shank
• 6-inch length under head accommodates thick stack-ups or deep joint applications
• Smooth flange diameter of 1-21/64 inches distributes clamping load without a separate washer
• Grade 8 alloy steel construction provides high tensile and proof load capacity
• Phosphate and oil finish offers baseline corrosion protection and lubricity for consistent torque-tension relationship
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as a standard inch-series partially threaded smooth flange bolt compatible with any application requiring a 5/8-11 UNC Grade 8 fastener with a 6-inch grip length under head.

Installation Notes

Installation should be performed by qualified mechanics or technicians familiar with high-strength fastener torque requirements. Always verify thread engagement depth and joint material compatibility before installation. Consult applicable engineering specifications or torque tables for Grade 8 fasteners of this diameter when determining proper clamp load. Inspect the flange bearing surface and mating material for burrs or contamination prior to assembly.