Value Collection 218238MSC Carriage Bolt 3/4-10 4.5 in Grade 8

Product Description

The VALUE COLLECTION 218238MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications in structural, mechanical, and industrial assemblies. With a 3/4-10 UNC thread and a 4.5-inch length under head, this fully threaded fastener provides maximum thread engagement across the full shaft length. The square neck beneath the domed head locks into wood or soft material substrates to prevent rotation during nut tightening, making installation straightforward with a single wrench. The bright uncoated finish suits indoor or controlled-environment use. This bolt meets SAE J429 standards, confirming material and mechanical property compliance for demanding load-bearing connections.

This carriage bolt is suited for heavy-duty construction, equipment fabrication, timber framing, and general industrial assembly where Grade 8 tensile strength is required. The 3/4-10 UNC thread is a common heavy fastener size found in steel-to-steel and steel-to-wood connections on structural frames, machinery bases, conveyor systems, and agricultural equipment. Sold individually, it is appropriate for replacement or low-volume service work.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load ratings per SAE J429
• Fully threaded shaft at 4.5 inches length under head maximizes thread engagement
• 3/4-10 UNC thread form for compatibility with standard heavy hex nuts and hardware
• Square neck under domed head prevents bolt rotation without a second wrench
• Bright uncoated finish — suitable for dry or protected indoor environments
• SAE J429 certified fastener standard compliance

Compatibility

Designed as a standard inch-series carriage bolt compatible with 3/4-10 UNC heavy hex nuts, flat washers, and lock washers used in structural and mechanical fastening assemblies.

Installation Notes

Installation is typically performed by millwrights, ironworkers, carpenters, or general mechanics using a standard hex wrench or impact driver on the nut side — no tool is applied to the domed head. Power down or de-energize any equipment before fastener replacement on machinery. For structural applications, consult applicable building codes and torque specifications from engineering documentation, as this listing does not supply torque values. The bright uncoated finish offers no corrosion protection — avoid use in wet, outdoor, or chemically aggressive environments without additional protective measures.