Value Collection 821287MSC Flange Bolt 5/8-11 Unc 5-1/2 in Grade 8

Product Description

The VALUE COLLECTION 821287MSC is a smooth flange bolt designed for heavy-duty fastening applications requiring a Grade 8 alloy steel fastener with an integrated flange bearing surface. The bolt features a 5/8-11 UNC thread form and measures 5-1/2 inches in length under the head. Threading is partial, with 1-1/2 inches of thread length, leaving the shank unthreaded for shear-load applications. The smooth flange eliminates the need for a separate washer by distributing clamp load across the 1-21/64-inch flange diameter. A phosphate and oil finish provides baseline corrosion resistance and lubricity during installation. This fastener meets IFI 111 and SAE J429 standards for alloy steel hex flange bolts.

This bolt is suited for structural and mechanical assemblies in industrial, commercial, and heavy equipment applications where high tensile strength and consistent load distribution are required. The hex drive allows installation with standard hand tools or impact drivers. Partial threading is appropriate where the unthreaded shank must pass through a clearance hole and only the engaged material is threaded. Common applications include equipment frames, flanged joints, machinery mounts, and fabrication assemblies requiring Grade 8 fastener performance.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load capacity
• 5/8-11 UNC thread form, partially threaded with 1-1/2 inches of thread engagement
• Integrated smooth flange at 1-21/64 inches diameter replaces a separate flat washer
• Phosphate and oil finish for corrosion resistance and reduced installation friction
• Hex drive compatible with standard wrenches and impact sockets
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as a standard 5/8-11 UNC smooth flange bolt for use in any application requiring a Grade 8 partially threaded hex flange fastener in the inch measurement system.

Installation Notes

Install using a standard hex wrench or impact socket sized for 5/8-inch hex flange bolts. Verify that mating threads and clearance holes are clean and free of debris before assembly. Tighten to the torque specification required by the assembly design for Grade 8 fasteners of this thread size — do not exceed the design specification. The phosphate and oil finish may be used as-supplied with or without additional thread lubricant per the assembly requirement.