Value Collection 821249MSC Flange Bolt 5/8-11 Unc 1-1/4 in Grade 8

Product Description

The VALUE COLLECTION 821249MSC is a smooth flange bolt designed for high-strength fastening applications requiring a built-in bearing surface. The flange distributes clamping load over a wider area than a standard hex bolt, reducing the need for a separate washer. This bolt features a 5/8-11 UNC thread form, is fully threaded along its 1-1/4 inch length under head, and is manufactured from Grade 8 alloy steel with a phosphate and oil finish for corrosion resistance. It is installed using a standard hex drive. Tradespeople working on mechanical assemblies, HVAC equipment frames, structural brackets, and industrial machinery will encounter this fastener in typical service work.

This bolt is suited for heavy-duty mechanical and structural fastening where high tensile strength is required. The smooth flange face provides a clean bearing surface against the mating material without serrations, making it appropriate for applications where the joint may need to be disassembled and reassembled without damaging the mating surface. The phosphate and oil finish provides moderate corrosion protection for indoor and controlled-environment installations. The fully threaded shank offers maximum thread engagement across the full grip length.

Key Features

• 5/8-11 UNC fully threaded shank for maximum thread engagement
• Grade 8 alloy steel construction for high tensile and proof load strength
• Smooth flange face with 1-21/64 inch (1.3281 inch) flange diameter distributes clamping load without a separate washer
• Phosphate and oil finish provides moderate corrosion and galling resistance
• Hex drive compatible with standard wrenches and sockets
• Meets IFI 111 and SAE J429 standards

Compatibility

Designed as an OEM-style replacement or service fastener for mechanical assemblies requiring 5/8-11 UNC smooth flange bolts meeting IFI 111 and SAE J429 specifications.

Installation Notes

Installation is performed by mechanics and maintenance technicians using standard hex wrenches or impact sockets. Torque the bolt to the value specified in the equipment service manual for Grade 8 fasteners at 5/8-11 UNC. Always de-energize and lock out equipment before replacing structural or mechanical fasteners. Do not reuse fasteners that show thread damage, corrosion, or deformation.