Value Collection 47118 Flange Bolt 1/2-20 Unf 2 in Grade 8

Product Description

The VALUE COLLECTION 47118 is a partially threaded smooth flange bolt designed for high-strength fastening applications requiring a built-in bearing surface. Sized at 1/2-20 UNF with a 2-inch length under head, this bolt features a 1-5/64-inch (1.0781-inch) smooth flange diameter that distributes clamping load without a separate washer. The hex drive allows installation with standard socket or wrench tooling. Manufactured from Grade 8 alloy steel with a zinc-plated finish, the 47118 delivers tensile strength and corrosion resistance suited to mechanical, industrial, and heavy-duty assembly work. Thread length is 1-1/4 inches, leaving a smooth shank section between the flange and the threaded portion. Sold in a pack of 50.

Smooth flange bolts in the 1/2-20 UNF configuration are commonly used in equipment mounting, structural assemblies, and mechanical sub-assemblies where vibration resistance and load distribution matter. The Grade 8 alloy steel rating makes this fastener appropriate for high-stress joints in industrial machinery, vehicle frames, HVAC equipment bases, and similar applications. The zinc plating provides a baseline level of corrosion protection for indoor and light outdoor environments. These bolts are typically installed by millwrights, mechanical contractors, HVAC technicians, and maintenance professionals working on fabricated steel assemblies.

Key Features

• 1/2-20 UNF thread form with 1-1/4 inch thread length and partial threading for precise engagement control
• Smooth flange diameter of 1-5/64 inches (1.0781 inches) distributes clamp load, eliminating the need for a separate washer
• Grade 8 alloy steel construction provides high tensile and proof load strength
• Zinc-plated finish for corrosion resistance in standard service environments
• Hex drive compatible with standard sockets, box wrenches, and impact drivers
• Meets IFI 111 and SAE J429 fastener standards
• Packed in quantities of 50 per order unit

Compatibility

Designed as a standard-inch UNF flange bolt suitable for any 1/2-20 tapped hole application requiring a partially threaded, smooth-flange, Grade 8 fastener per IFI 111 and SAE J429 specifications.

Installation Notes

Install with the correct 3/4-inch hex socket or open-end wrench; do not use pliers or adjustable wrenches on the hex flange. Verify mating thread condition before installation to avoid galling the zinc finish. Follow applicable torque specifications from the equipment manufacturer or a recognized fastener torque table for Grade 8 1/2-20 UNF bolts. Zinc-plated fasteners are not rated for submerged or high-humidity environments without additional corrosion protection.