Value Collection 218237MSC Carriage Bolt 3/4-10 4-1/2 in Grade 8

Product Description

The VALUE COLLECTION 218237MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications requiring a smooth, rounded head and a square neck that resists rotation during installation. This bolt features a 3/4-10 UNC thread with a fully threaded shank measuring 4-1/2 inches under the head. The clear zinc chromate finish provides corrosion resistance suitable for general industrial and structural use. It conforms to SAE J429 standards, making it an appropriate choice for load-bearing assemblies where fastener grade and dimensional consistency are critical. Machinists, millwrights, ironworkers, and general contractors commonly install this fastener type.

This carriage bolt is suited for structural connections, machinery mounting, timber framing, and fabrication work where a flush or domed head profile is required on the bearing surface. The square neck seats into a mating hole to prevent spinning without requiring a wrench on the head. It is sold individually and is appropriate for both shop and field installation in a wide range of industrial and construction environments.

Key Features

• Grade 8 alloy steel construction for high tensile strength and load-bearing reliability
• Fully threaded 4-1/2 inch shank at 3/4-10 UNC for maximum thread engagement
• Square neck design prevents bolt rotation during nut tightening without head tooling
• Clear zinc chromate finish provides baseline corrosion protection
• Conforms to SAE J429 fastener standard for dimensional and mechanical consistency
• Sold as a single unit with no minimum order beyond one piece

Compatibility

Designed as a standard UNC carriage bolt for use in structural steel, timber, and fabricated assemblies requiring a 3/4-10 thread diameter and 4-1/2 inch length under head per SAE J429 specifications.

Installation Notes

Installation is performed by qualified tradespeople including ironworkers, millwrights, and carpenters depending on the application. Insert the bolt through a properly sized hole so the square neck seats fully and prevents rotation, then apply a hardened washer and compatible nut on the opposite side before torquing. Always verify that the mating nut and washer grade are compatible with Grade 8 fasteners to maintain assembly integrity. Follow applicable structural or mechanical codes for required torque values and inspection intervals.