Value Collection 217377MSC Carriage Bolt 5/8-11 8 in Grade 8

Product Description

The VALUE COLLECTION 217377MSC is a fully threaded carriage bolt designed for high-strength fastening applications in structural, mechanical, and general industrial assembly. Built to Grade 8 alloy steel with a zinc trivalent chromate finish, this bolt delivers superior tensile strength and corrosion resistance compared to lower-grade fasteners. It features a 5/8-11 UNC thread and an 8-inch length under head, making it suitable for through-bolt applications that require deep thread engagement. The square neck under the domed head prevents rotation during installation without requiring a wrench on the bolt side. This fastener meets SAE J429 standards and is sold individually.

This carriage bolt is used in heavy-duty structural connections, equipment mounting, wood-to-metal assemblies, and fabrication work where Grade 8 strength is specified. The fully threaded shaft allows nut placement anywhere along the shank length, giving installers flexibility in material stack thickness. Typical users include ironworkers, millwrights, contractors, and maintenance trades working on structural frames, conveyor systems, agricultural equipment, and similar industrial applications.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load strength
• Zinc trivalent chromate finish provides corrosion protection and meets RoHS-compliant plating standards
• 5/8-11 UNC fully threaded shank allows flexible nut positioning along full 8-inch length
• Square neck under domed head locks into material to prevent bolt rotation during tightening
• Manufactured to SAE J429 fastener standard
• Sold as a single unit — order exact quantities needed

Compatibility

Designed as a standard UNC 5/8-11 Grade 8 carriage bolt suitable for use with any 5/8-11 UNC hex nut and compatible washers in structural or mechanical assemblies requiring SAE J429 Grade 8 specifications.

Installation Notes

Installation is typically performed by qualified tradespeople using a standard wrench or impact tool on the mating nut while the square neck seats into the substrate to resist rotation. Always drill or punch a hole sized appropriately for the bolt diameter to allow the square neck to seat properly without splitting the material. Follow applicable structural or mechanical codes for torque requirements based on joint classification and Grade 8 specifications. Inspect the finish for damage before installation in corrosive environments and replace if coating integrity is compromised.