Value Collection 218378MSC Carriage Bolt 3/4-10 8 in Grade 8

Product Description

The VALUE COLLECTION 218378MSC is a fully threaded carriage bolt designed for high-strength fastening applications in structural, mechanical, and industrial assemblies. Manufactured from Grade 8 alloy steel with a bright uncoated finish, this bolt delivers the tensile strength required for demanding load-bearing connections. The 3/4-10 UNC thread runs the full 8-inch length under head, making it suitable for through-bolt applications where grip length must span thick material stacks. Licensed electricians, millwrights, structural ironworkers, and mechanical contractors regularly specify Grade 8 carriage bolts for steel-to-steel and steel-to-wood connections where SAE J429 compliance is required.

This carriage bolt is suited for use in residential and commercial structural framing, equipment mounting, conveyor systems, and heavy-duty jig and fixture fabrication. The square neck under the round dome head resists rotation during nut tightening, eliminating the need for a wrench on the bolt side. At 8 inches in length under head with a 3/4-10 UNC thread, it accommodates thick sandwich assemblies or extended through-bolt configurations common in steel framing and machinery bases.

Key Features

• Grade 8 alloy steel construction meets SAE J429 for high tensile and proof load strength
• Fully threaded 8-inch length under head allows maximum grip adjustment
• 3/4-10 UNC thread standard ensures broad nut and hardware compatibility
• Square neck locks into material during installation, preventing bolt spin without a second tool
• Bright uncoated finish suitable for indoor or protected environments where coating is applied after assembly
• Single-piece packaging (Pkg Qty: 1) for job-site or MRO single-unit replacement use

Compatibility

Designed as an OEM-style and general-use replacement carriage bolt for any application requiring a 3/4-10 UNC, 8-inch fully threaded fastener with a square neck and Grade 8 alloy steel rating per SAE J429.

Installation Notes

Installation is typically performed by millwrights, structural ironworkers, or mechanical contractors using standard open-end, box, or impact wrenches sized for 3/4-inch fasteners. Always power down or de-energize any mechanical system before replacing structural fasteners under load. Verify mating nut grade and thread class are compatible with Grade 8 hardware to avoid mismatched joint strength. Follow applicable structural or mechanical codes for torque procedure and joint inspection after installation.