Value Collection 218217MSC Carriage Bolt 3/4-10 4 in Grade 8

Product Description

The VALUE COLLECTION 218217MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. Featuring a 3/4-10 UNC thread and a 4-inch length under head, this bolt is fully threaded from the underside of the head to the tip. The square neck beneath the domed head locks into wood or soft material, preventing rotation during tightening without the need for a wrench on the bolt head. Clear zinc chromate finish provides corrosion resistance in typical service environments. Manufactured to SAE J429 standards, this fastener suits structural and mechanical assembly work where high tensile strength and thread integrity are required.

This carriage bolt is used in residential and commercial construction, heavy equipment assembly, timber connections, and structural steel fabrication. It is appropriate for through-bolt applications in wood-to-wood, wood-to-steel, and steel-to-steel connections where Grade 8 rated tensile strength is specified. Trade professionals including ironworkers, millwrights, carpenters, and general contractors commonly install this fastener in structural framing, machinery mounting, and bridge or deck construction. The 3/4-10 thread size and full threading profile make it suitable for use with standard hex nuts and hardened washers.

Key Features

• Grade 8 alloy steel construction for high tensile and proof-load strength
• Fully threaded 3/4-10 UNC profile along the full 4-inch length under head
• Square neck beneath the dome head resists rotation during assembly
• Clear zinc chromate finish for corrosion protection in standard service conditions
• Manufactured to SAE J429 fastener standard
• Inch system of measurement; compatible with standard 3/4-inch hardware

Compatibility

Designed for use with 3/4-10 UNC hex nuts, flat washers, and lock washers in standard inch-system fastener applications requiring a Grade 8 carriage bolt.

Installation Notes

Installation is typically performed by carpenters, ironworkers, or millwrights using standard hand or power tools. Always de-energize or relieve load from the assembly before replacing or torquing structural fasteners. The square neck requires a correctly sized square hole or soft substrate to seat properly and prevent spinning; do not force the neck into an oversized opening. Follow applicable structural or mechanical codes for torque requirements and washer usage when Grade 8 fasteners are specified.