Value Collection 218218MSC Carriage Bolt 3/4-10 4in Grade 8

Product Description

The VALUE COLLECTION 218218MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications in structural, mechanical, and equipment assembly work. It features a 3/4-10 UNC thread with a fully threaded shank measured 4 inches under the head, and a square neck beneath the domed head that locks into place when driven into a mating surface, preventing rotation during installation. The uncoated bright finish is consistent with Grade 8 specifications and meets SAE J429 standards. This bolt is suited for applications requiring a higher tensile strength than standard Grade 5 hardware.

This carriage bolt is used in a wide range of trade and industrial applications including structural framing connections, machinery mounting, trailer and vehicle body assembly, and heavy equipment fabrication. The fully threaded shank provides maximum thread engagement across the full 4-inch length under the head. It is sold individually and is appropriate for use wherever SAE J429 Grade 8 compliance is required.

Key Features

• Grade 8 alloy steel construction for high tensile strength and shear resistance
• Fully threaded shank across entire 4-inch length under head
• 3/4-10 UNC thread standard for compatibility with standard inch-series nuts and hardware
• Square neck prevents bolt rotation during nut tightening without requiring a wrench on the head
• Uncoated bright finish meets SAE J429 fastener standard
• Sold individually with a minimum order quantity of 1

Compatibility

Designed as a standard inch-series SAE J429 Grade 8 carriage bolt compatible with 3/4-10 UNC nuts, washers, and mating hardware in structural and mechanical fastening assemblies.

Installation Notes

Installation is typically performed by ironworkers, millwrights, or general tradespeople using standard wrenches or impact tools rated for 3/4-inch fasteners. Before installation, ensure mating surfaces and clearance holes are properly sized for a 3/4-inch bolt diameter. The square neck must seat fully into the mating hole to prevent rotation — do not substitute a round or oversized hole. Always verify torque requirements against the applicable structural or equipment specification before final tightening.