Value Collection 217147MSC Carriage Bolt 5/8-11 2-1/4 in Grade 8

Product Description

The VALUE COLLECTION 217147MSC is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 2-1/4-inch length under head. The bolt features a square neck below the domed head, which locks into a mating hole to prevent rotation during installation without requiring a wrench on the bolt head. A zinc trivalent chromate finish provides corrosion resistance for general industrial and structural applications. The bolt is fully threaded along its entire shank length. It meets SAE J429 standards and is appropriate for high-strength fastening applications where Grade 8 tensile performance is required.

This carriage bolt is suited for structural assemblies, equipment mounting, and heavy-duty fabrication work in industrial and commercial settings. The 5/8-11 coarse thread and Grade 8 rating make it a common choice for steel-to-steel connections, frame construction, and machinery mounting where elevated shear and tensile loads are expected. A licensed mechanic, ironworker, millwright, or maintenance technician would typically install this fastener in conjunction with a heavy hex nut and appropriate hardened washer.

Key Features

• Grade 8 alloy steel construction for high tensile and shear strength
• 5/8-11 UNC coarse thread, fully threaded along the shank
• Square neck beneath domed head prevents bolt rotation during nut tightening
• Zinc trivalent chromate finish for corrosion resistance
• Meets SAE J429 fastener standard
• 2-1/4-inch length measured under head

Compatibility

Designed as a standard 5/8-11 UNC carriage bolt for use with any compatible 5/8-11 heavy hex nut and hardened washer in structural or industrial fastening applications requiring Grade 8 alloy steel performance.

Installation Notes

Installation is typically performed by a mechanic, ironworker, or maintenance technician using a standard socket or open-end wrench on the mating nut. Insert the bolt through a properly sized hole so the square neck seats fully and prevents rotation before applying the nut. Follow applicable torque specifications from a recognized fastener reference or engineering standard for Grade 8 hardware at this thread size. Always inspect threads for damage and ensure the mating hole is clean and free of burrs before installation.