Value Collection 821789MSC Flange Bolt 1/2-13 Unc 4 in Grade 8

Product Description

The VALUE COLLECTION 821789MSC is a partially threaded smooth flange bolt designed for heavy-duty mechanical fastening applications. It features a 1/2-13 UNC thread size with 1.25 inches of thread length and a total length under head of 4 inches. The integral smooth flange measures 1-5/64 inches (1.0781 inches) in diameter, distributing clamp load over a wider bearing surface without the need for a separate washer. Constructed from Grade 8 alloy steel with a phosphate and oil finish, this bolt delivers high tensile strength and corrosion resistance suitable for demanding structural and mechanical assemblies. Licensed trades and maintenance professionals working with heavy equipment, industrial machinery, or structural steel will find this fastener meets IFI 111 and SAE J429 standards.

This flange bolt is suited for use in industrial, commercial, and heavy equipment applications where a high-strength, partially threaded fastener with an integrated flange is required. The smooth flange face provides a clean bearing surface against the mating material, making it appropriate for engine mounts, frame assemblies, brackets, and similar structural connections. It is sold individually but requires a minimum order quantity of 50 units, making it practical for fleet maintenance shops, MRO supply operations, and production assembly lines.

Key Features

• Grade 8 alloy steel construction provides high tensile and proof load strength for demanding fastening applications
• Partially threaded shank with 1.25 inches of thread engagement allows precise clamping without over-threading into the joint
• Smooth integral flange at 1-5/64 inches (1.0781 inches) diameter eliminates the need for a separate flat washer
• Phosphate and oil finish offers baseline corrosion resistance and lubricity for consistent torque-tension relationships
• Hex drive head is compatible with standard 3/4-inch hex sockets and wrenches
• Meets IFI 111 and SAE J429 fastener standards for dimensional and mechanical compliance

Compatibility

Designed as an OEM-style replacement or direct-use fastener for applications requiring a 1/2-13 UNC partially threaded smooth flange bolt with a 4-inch length under head in Grade 8 alloy steel.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician familiar with fastener torque specifications for Grade 8 hardware. Always degrease mating surfaces unless the fastener finish is intended to serve as a thread lubricant. Use a calibrated torque wrench and follow the torque values specified by the equipment manufacturer or applicable engineering standards for 1/2-13 UNC Grade 8 fasteners. Inspect threads and flange face for damage before installation and do not reuse fasteners that show signs of stretching or galling.