Value Collection C39051 Flange Bolt 5/8-11 Unc 3 in Grade 8

Product Description

The VALUE COLLECTION C39051 is a partially threaded smooth flange bolt designed for structural fastening applications requiring a load-distributing flange head. Built from Grade 8 alloy steel and left uncoated, this bolt features a 5/8-11 UNC thread pattern with 1.5 inches of threaded length on a 3-inch length-under-head shank. The integrated smooth flange measures 1.3281 inches (1-21/64 inches) in diameter, spreading clamp load across the bearing surface without a separate washer. Hex drive allows standard socket or wrench installation. Manufactured to IFI 111 and SAE J429 standards, making it a verified option for high-strength mechanical assemblies.

This bolt is suited for heavy-duty mechanical, industrial, and trade applications where Grade 8 tensile strength and UNC threading are specified. Typical installation scenarios include structural steel connections, equipment mounting, and machine assembly where flange-style heads are preferred to eliminate loose washers and maintain consistent clamp loads. The partially threaded shank provides a smooth bearing surface through the joint interface, which is important in shear-loaded connections. Professionals in HVAC equipment rigging, plumbing equipment mounting, and general industrial maintenance will recognize this as a standard high-strength fastener for demanding service.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load strength
• 5/8-11 UNC thread standard with 1.5 inches of threaded engagement length
• Smooth flange head at 1.3281 inches diameter distributes clamping load without a separate washer
• Partially threaded shank allows clean shear-zone bearing through joint material
• Hex drive compatible with standard sockets and open-end wrenches
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as a standard 5/8-11 UNC Grade 8 smooth flange bolt suitable for structural and mechanical assemblies specifying IFI 111 or SAE J429 compliant high-strength fasteners.

Installation Notes

Installation is performed with a standard hex socket or combination wrench sized for a 5/8-inch bolt head. Verify mating thread condition and ensure the flange seating surface is clean and free of debris before torquing. Follow the applicable fastener torque specification table for Grade 8 5/8-11 UNC bolts as defined by your project or equipment OEM documentation. Do not exceed rated proof load, and inspect threads for damage before reuse in critical joints.