Value Collection 217148MSC Carriage Bolt 5/8-11 2-1/4 in Grade 8

Product Description

The VALUE COLLECTION 217148MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. It features a 5/8-11 UNC thread with a 2-1/4 inch length under head and is fully threaded along its entire shank. The square neck below the domed head locks the bolt against rotation as the nut is tightened, eliminating the need for a wrench on the bolt head. The uncoated, bright finish is standard for Grade 8 hardware and is compatible with most field plating or coating processes. This fastener meets SAE J429 standards and is suited for structural and mechanical assembly work across industrial and construction trades.

This carriage bolt is used in heavy-duty structural connections, machinery framing, timber construction, and equipment mounting where a flush, domed head is required on the accessible face of the joint. The 5/8-11 coarse thread engages quickly in wood or through clearance holes in steel plate and pairs with a standard 5/8-inch hex nut and washer. It is a common choice for fabricators, ironworkers, and general contractors working with heavy structural members or equipment bases.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load ratings
• 5/8-11 UNC coarse thread, fully threaded for maximum engagement flexibility
• Square neck design prevents bolt rotation during nut installation
• Bright uncoated finish, compatible with post-installation coating or plating
• Meets SAE J429 fastener standard
• 2-1/4 inch length under head suits medium-depth structural connections

Compatibility

Designed as a standard inch-series carriage bolt for use with 5/8-11 UNC hex nuts and flat washers in structural wood, steel plate, and equipment mounting applications conforming to SAE J429 requirements.

Installation Notes

Installation is typically performed by ironworkers, structural fabricators, or general construction tradespeople. Insert the bolt through the pre-drilled clearance hole so the square neck seats firmly into the material, preventing rotation, then torque the nut from the opposite side using a standard hex wrench or impact driver with the appropriate socket. Do not overtighten without reference to a fastener torque specification appropriate for the joint material and grade. Follow applicable structural and mechanical codes for the assembly type.