Value Collection 218298MSC Carriage Bolt 3/4-10 6 in Grade 8

Product Description

The VALUE COLLECTION 218298MSC is a Grade 8 alloy steel carriage bolt sized 3/4-10 UNC with a 6-inch length under the head. It features a square neck that locks into the bearing surface to prevent rotation during installation, eliminating the need to hold the bolt head while tightening the nut. The fully threaded shank runs the complete 6-inch length, providing maximum thread engagement across the full grip range. At 0.813 pounds per unit, this is a heavy-duty fastener suited for structural and high-strength bolted connections in trade and industrial applications. The uncoated bright finish is standard for Grade 8 fasteners used in applications where coating is applied separately or not required.

This carriage bolt is used in structural assemblies, heavy equipment, agricultural machinery, and construction framing connections where high tensile strength is required. The Grade 8 alloy steel rating makes it appropriate for high-load bolted joints in steel-to-steel or steel-to-wood applications. Installers in mechanical, construction, and maintenance trades use this fastener when torque requirements exceed the capacity of lower-grade hardware. It conforms to SAE J429 standards, making it a recognized specification fastener for documented mechanical assemblies.

Key Features

• Grade 8 alloy steel construction for high tensile strength in demanding structural applications
• 3/4-10 UNC thread size with fully threaded 6-inch shank for maximum engagement
• Square neck design locks against the bearing surface to prevent bolt rotation during tightening
• Bright uncoated finish suitable for applications where additional coating is applied post-installation
• Conforms to SAE J429 fastener standard for verified mechanical performance
• Sold individually, allowing single-unit procurement for repair and replacement work

Compatibility

Designed as a standard SAE J429 Grade 8 carriage bolt compatible with any 3/4-10 UNC threaded nut and corresponding hardware in structural, mechanical, and construction assemblies requiring high-strength inch-series fasteners.

Installation Notes

Installation is performed by tradespeople and maintenance technicians working on structural or mechanical assemblies. Before installation, verify the mating nut and any washer are rated to Grade 8 or equivalent to maintain joint integrity. The square neck must seat fully into the corresponding square hole in the mating material to prevent rotation under torque. Apply torque to the nut only, using a calibrated torque wrench where fastener specifications require verified clamping force.