Value Collection 216138MSC Carriage Bolt 1/2-13 2in Grade 8

Product Description

The VALUE COLLECTION 216138MSC is a Grade 8 alloy steel carriage bolt with a 1/2-13 UNC thread and a 2-inch length under head. The square neck design locks the bolt in place against the workpiece to prevent rotation during nut tightening, eliminating the need for a wrench on the bolt head. The uncoated, bright finish is the as-manufactured surface condition with no additional plating or coating applied. Fully threaded along the entire 2-inch shank, this bolt suits applications where full thread engagement is required throughout the joint. Sold in packages of 50, it is appropriate for structural assemblies, woodworking connections, and general fabrication work where Grade 8 tensile strength is specified.

This carriage bolt is suited for use in structural and mechanical assemblies that require a high-strength UNC fastener. The 1/2-13 thread pitch is a standard coarse-thread designation common in steel fabrication, trailer construction, agricultural equipment, and heavy-duty wood-to-steel connections. Grade 8 alloy steel provides higher proof load and tensile strength compared to Grade 5 or Grade 2 fasteners, making it appropriate for high-stress joints. The fully threaded configuration allows engagement at any point along the shank, which can be useful in variable-thickness connections.

Key Features

• Grade 8 alloy steel construction for high-strength fastening applications
• 1/2-13 UNC fully threaded shank, 2 inches length under head
• Square neck design prevents bolt rotation during installation without a wrench on the head
• Uncoated bright finish — no plating, no coating, bare alloy steel
• Meets SAE J429 fastener standard for Grade 8 mechanical and chemical requirements
• Sold in a 50-piece package quantity

Compatibility

Designed as a standard 1/2-13 UNC carriage bolt for use with any hex nut, structural plate, or wood member drilled to accept a 1/2-inch fastener where Grade 8 alloy steel strength and a square-neck anti-rotation profile are required.

Installation Notes

Installation is typically performed by inserting the bolt through a pre-drilled hole sized to allow the square neck to seat flush and resist rotation, then threading a compatible 1/2-13 nut from the opposite side. Always verify that the mating material thickness allows the square neck to fully engage before applying torque to the nut. Use a properly rated wrench or socket on the nut side only — do not apply a wrench to the round carriage bolt head. Follow applicable structural or mechanical design specifications for joint preload requirements.