Value Collection KP64918 Carriage Bolt 3/4-10 4in Grade 8

Product Description

The VALUE COLLECTION KP64918 is a 3/4-10 UNC carriage bolt with a 4-inch length under head, manufactured from Grade 8 alloy steel with a zinc-plated clear chromate finish. The square neck below the domed head locks into a mating hole to prevent rotation during installation, eliminating the need for a backup wrench on the bolt side. Fully threaded along the 4-inch shank, this fastener is suited for high-strength structural connections in heavy equipment, trailer frames, and industrial fabrication applications. Installation is performed by mechanics, ironworkers, and general tradespeople working with bolted steel assemblies.

This carriage bolt meets SAE J429 standards, confirming its Grade 8 mechanical property requirements including elevated proof load and tensile strength. The zinc-plated clear chromate finish provides a baseline level of corrosion resistance for indoor and sheltered outdoor installations. Typical applications include structural steel connections, trailer hitch assemblies, agricultural equipment frames, and heavy-duty wood-to-steel fastening where a flush, low-profile head is required on the bearing face. Sold in a package quantity of 25.

Key Features

• 3/4-10 UNC thread size, fully threaded 4-inch shank length under head
• Grade 8 alloy steel construction for high-strength bolted connections
• Square neck below head prevents rotation without a backup tool
• Zinc-plated clear chromate finish for baseline corrosion resistance
• Meets SAE J429 fastener standard for Grade 8 mechanical properties
• Sold in a package of 25 bolts

Compatibility

Designed as a standard 3/4-10 UNC Grade 8 carriage bolt suitable for structural steel, wood-to-steel, and heavy equipment assemblies requiring SAE J429 Grade 8 fasteners with a square-neck, round-head profile.

Installation Notes

Installation is performed by mechanics, ironworkers, or qualified tradespeople using a standard hex nut and washer on the threaded end. The square neck must fully seat into the mating square hole in the workpiece before torquing the nut to prevent bolt spin. Always verify that the mating material and nut grade are compatible with Grade 8 fastener requirements. Consult applicable structural or equipment specifications for proper torque values before final assembly.