Value Collection 821084 Flange Bolt 1/2-20 Unf 2 Inch Grade 8

Product Description

The VALUE COLLECTION 821084 is a smooth flange bolt engineered for high-strength fastening applications requiring a built-in load-distributing flange. Sized at 1/2-20 UNF with a 2-inch length under head, this partially threaded bolt features a 1.0781-inch (1-5/64 inch) smooth flange diameter that spreads clamping force across the bearing surface without the need for a separate washer. Manufactured from Grade 8 alloy steel with a phosphate and oil finish, it delivers elevated tensile strength and corrosion resistance suitable for demanding mechanical assemblies. The hex drive allows standard socket or wrench installation in tight or open clearances.

This bolt is suited for industrial, automotive, heavy equipment, and structural applications where a high-strength UNF fastener with a flanged bearing surface is required. The partial threading design — 1.25 inches of thread on a 2-inch shank — provides a shoulder section useful for shear-loaded joints and close-tolerance bores. Maintenance technicians, machine builders, and assembly crews working with Grade 8 hardware will find this bolt a direct fit for standard flanged-bolt joint designs.

Key Features

• 1/2-20 UNF thread form — fine-thread pitch for improved clamp load and vibration resistance
• Grade 8 alloy steel construction for high tensile and proof load ratings
• Smooth flange diameter of 1.0781 inches eliminates need for a separate flat washer
• Partial threading — 1.25 inches of thread on a 2-inch under-head length — supports shear-loaded joint designs
• Phosphate and oil finish provides corrosion and galling resistance
• Hex drive compatible with standard sockets and combination wrenches
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as an OEM-style replacement or maintenance-stock fastener for assemblies specifying a 1/2-20 UNF Grade 8 smooth flange bolt with a 2-inch length under head per IFI 111 and SAE J429 standards.

Installation Notes

Installation is performed by general mechanics, millwrights, or assembly technicians using a standard 3/4-inch hex socket or open-end wrench. Always clean and inspect the mating threads before installation. Torque to the value specified by the joint designer or applicable engineering standard for Grade 8 fasteners at this thread size — do not use a generic torque value without confirming the joint design. Grade 8 bolts should not be reused in critical joints after removal.