Value Collection 216218MSC Carriage Bolt 1/2-13 4in Grade 8

Product Description

The VALUE COLLECTION 216218MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. It features a 1/2-13 UNC thread and a 4-inch length measured under the head, with full threading along the entire shank. The square neck beneath the domed head locks into wood or fabricated holes to prevent rotation during installation without requiring a wrench on the bolt head. This bolt meets SAE J429 standards and carries an uncoated bright finish, making it well suited for applications where bare metal or subsequent coating is acceptable. Licensed trades and general contractors rely on this grade when structural loading demands a higher-tensile fastener.

This carriage bolt fits a wide range of heavy-duty structural and fabrication applications including timber framing, equipment mounting, trailer assembly, and steel-to-wood connections. The Grade 8 rating indicates a minimum tensile strength suitable for demanding load-bearing joints. It is commonly used in agricultural equipment, construction framing, and industrial machinery assembly where standard Grade 5 hardware is insufficient. The fully threaded shank provides maximum thread engagement across varying material thicknesses.

Key Features

• 1/2-13 UNC thread for compatibility with standard American hardware
• 4-inch length under head for deep material engagement
• Grade 8 alloy steel construction for high tensile strength per SAE J429
• Fully threaded shank maximizes thread engagement at any stack thickness
• Square neck design prevents bolt rotation during nut tightening
• Bright uncoated finish suitable for painting, plating, or bare use

Compatibility

Designed as a standard 1/2-13 UNC carriage bolt compatible with any hex nut, washer, or coupling nut of the same thread size and inch measurement system.

Installation Notes

Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and prevent spinning. Draw up the mating nut with a wrench while holding the dome head steady. Power down or de-energize any associated equipment before installing fasteners in electrical or mechanical assemblies. Follow applicable structural codes such as AISC or NDS for timber connections when determining torque requirements for the application.