Value Collection 218257MSC Carriage Bolt 3/4-10 5 in Grade 8

Product Description

The VALUE COLLECTION 218257MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. It features a 3/4-10 UNC thread with a 5-inch length under head, fully threaded along the entire shank. The square neck under the domed head bites into the mating material to prevent rotation during installation, eliminating the need for a wrench on the bolt head. A clear zinc chromate finish provides basic corrosion resistance. This bolt meets SAE J429 standards and is suited for structural and mechanical assemblies where high tensile strength is required.

This carriage bolt is used in structural framing, heavy equipment fabrication, timber connections, and general mechanical assembly where a flush, clean bolt-head appearance is needed on the face side. The fully threaded shank allows maximum engagement across a range of material thicknesses. It is commonly installed by millwrights, ironworkers, contractors, and maintenance technicians working on steel-to-steel or steel-to-wood connections in both commercial and industrial settings.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load strength
• 3/4-10 UNC fully threaded shank over 5 inches of length under head
• Square neck design prevents bolt rotation during nut tightening
• Clear zinc chromate finish for basic corrosion protection
• Meets SAE J429 fastener standard
• Rounded dome head provides a smooth, low-profile face surface

Compatibility

Designed as a standard UNC carriage bolt for use with 3/4-10 nuts and corresponding hardware in structural and mechanical assemblies requiring SAE J429 Grade 8 fasteners.

Installation Notes

Installation is performed by inserting the bolt through a pre-drilled hole so the square neck seats firmly into the material, then threading a nut and washer from the opposite side. Use a torque wrench on the nut side only — do not apply rotational force to the dome head. Verify hole diameter matches the bolt shank to ensure the square neck locks properly. Follow applicable structural or mechanical codes for torque and joint requirements.