Value Collection 821192MSC Flange Bolt 1/4-20 Unc 1/2 in Grade 8

Product Description

The Value Collection 821192MSC is a smooth flange bolt designed for general-purpose fastening applications requiring a built-in bearing surface. It features a 1/4-20 UNC thread with a 1/2-inch length under the head and is fully threaded along its entire length. The hex drive provides reliable torque transfer with standard tooling. Constructed from Grade 8 alloy steel with a phosphate and oil finish, this bolt offers high tensile strength and corrosion resistance suitable for demanding mechanical and structural assemblies. A 9/16-inch smooth flange distributes clamping load evenly, eliminating the need for a separate washer in most installations.

This bolt is well suited for automotive, industrial, and equipment assembly applications where a smooth flange face is required to protect mating surfaces or provide load distribution without a washer. It is commonly used by maintenance technicians, millwrights, and assembly professionals working on machinery, brackets, and structural components. The 1/4-20 UNC thread is one of the most widely used inch-series thread sizes, making this bolt a standard stocking item in maintenance, repair, and operations environments.

Key Features

• 1/4-20 UNC fully threaded shank for maximum thread engagement across the full 1/2-inch length under head
• Grade 8 alloy steel construction for high tensile and proof load strength
• Smooth 9/16-inch flange diameter distributes clamping load and eliminates separate washer requirement
• Phosphate and oil finish provides corrosion and abrasion resistance
• Hex drive compatible with standard open-end, box, and socket wrenches
• Meets SAE J429 standards for mechanical and material requirements

Compatibility

Designed as an OEM-style replacement or maintenance stock fastener for any assembly requiring a 1/4-20 UNC smooth flange bolt with a 1/2-inch length under head and Grade 8 strength rating.

Installation Notes

Installation is typically performed by qualified maintenance technicians or assembly professionals using standard hex wrenches or sockets. Ensure mating threads are clean and free of debris before installation. Apply torque values in accordance with the equipment manufacturer specifications or applicable standards for Grade 8 fasteners. Do not exceed recommended torque for the 1/4-20 thread size, as over-tightening can cause thread stripping or flange distortion.