Value Collection 217158MSC Carriage Bolt 5/8-11 2-1/2 in Grade 8

Product Description

The VALUE COLLECTION 217158MSC is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 2-1/2 inch length under head. The square neck below the domed head locks into wood or fabricated steel panels to prevent rotation during installation, eliminating the need for a second wrench on the fastener head. Fully threaded along the 2-1/2 inch shank, this bolt provides maximum thread engagement for nuts and thick structural assemblies. Grade 8 alloy steel delivers high tensile strength suitable for demanding structural and mechanical connections. The uncoated bright finish leaves the surface ready for plating, painting, or use as-is in dry or protected environments. Installed by mechanics, ironworkers, carpenters, and general contractors across a wide range of structural and equipment-mounting applications.

This carriage bolt is suited for timber framing, structural steel fabrication, machinery mounting, and general construction fastening where a flush, non-rotating bolt head is required. The 5/8-11 UNC thread is one of the most common coarse-thread sizes in inch-standard structural work, making hardware pairing straightforward. Typical applications include wood-to-steel connections, deck framing hardware, agricultural equipment repairs, and trailer or truck body assembly. The fully threaded shank allows the nut to be positioned anywhere along the bolt length, providing flexibility in joint thickness.

Key Features

• 5/8-11 UNC coarse thread for broad hardware compatibility
• 2-1/2 inch length under head, fully threaded shank
• Grade 8 alloy steel for high tensile strength structural use
• Square neck locks against substrate to prevent rotation during torquing
• Uncoated bright finish compatible with subsequent coating or plating
• Conforms to SAE J429 fastener standard

Compatibility

Designed as a standard inch-series carriage bolt compatible with 5/8-11 UNC hex nuts, flat washers, and lock washers per standard SAE inch hardware specifications.

Installation Notes

Installation requires inserting the bolt through a pre-drilled or punched hole sized to allow the square neck to seat and bite into the material, preventing spin. A standard open-end or socket wrench is used on the nut side only to draw the joint tight. Always verify hole diameter matches the bolt shank to ensure proper square-neck engagement. Follow applicable structural codes and torque guidelines for Grade 8 fasteners when specified by the project engineer or applicable standard.