Value Collection C39043 Flange Bolt 1/2-13 Unc 4 in Grade 8

Product Description

The VALUE COLLECTION C39043 is a smooth flange bolt designed for structural and mechanical fastening applications where a load-distributing flange head is required. Sized at 1/2-13 UNC with a 4-inch length under the head, this bolt is partially threaded with 1.25 inches of thread engagement. The integrated smooth flange measures 1-5/64 inches (1.0781 inches) in diameter, spreading clamp load across the mating surface without a separate washer. Manufactured from Grade 8 alloy steel and left uncoated, it meets IFI 111 and SAE J429 standards. Licensed tradespeople and maintenance technicians working on heavy equipment, machinery, and structural assemblies are the primary installers.

This flange bolt is suited for high-strength fastening in industrial, mechanical, and equipment-assembly applications. The partial threading design concentrates grip length in the unthreaded shank, making it appropriate for through-bolt installations where shear resistance matters. The hex drive allows standard socket or wrench installation. Sold in packages of 10, this bolt is commonly used in OEM-style repair and fabrication work requiring verified Grade 8 performance.

Key Features

• 1/2-13 UNC thread size with 1.25 inches of partial threading for controlled grip length
• 4-inch length under head accommodates thick-stack assemblies
• Smooth flange diameter of 1-5/64 inches (1.0781 inches) distributes clamp load without a separate washer
• Grade 8 alloy steel construction for high tensile and proof load requirements
• Uncoated finish — compatible with field-applied coatings or used as-is in dry indoor environments
• Meets IFI 111 and SAE J429 fastener standards

Compatibility

Designed as an OEM-style replacement or general-use fastener for industrial and mechanical assemblies requiring a 1/2-13 UNC Grade 8 smooth flange bolt with a 4-inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with Grade 8 fastener torque requirements. Always consult the equipment manufacturer's torque specification table before tightening — do not use generic torque values without verifying the specific joint design. Use a calibrated torque wrench and ensure mating threads are clean and free of debris before assembly. Inspect the flange seating surface for burrs or damage that could affect clamp load distribution.