Value Collection 215657MSC Carriage Bolt 3/8-16 5in Grade 8

Product Description

The VALUE COLLECTION 215657MSC is a Grade 8 alloy steel carriage bolt designed for high-strength fastening applications. Featuring a 3/8-16 UNC thread and a 5-inch length under head, this fully threaded fastener uses a square neck under the domed head to prevent rotation during installation. The zinc trivalent chromate finish provides corrosion resistance for both indoor and outdoor service environments. Compliant with SAE J429, it meets the mechanical requirements expected in structural and heavy-duty assemblies. Licensed trade professionals and experienced assemblers working on demanding load-bearing connections rely on Grade 8 hardware for its superior tensile and proof load ratings compared to lower-grade alternatives.

This carriage bolt is suited for structural wood-to-wood and wood-to-metal connections, equipment mounting, and general mechanical assemblies where high clamping force is required. Typical applications include agricultural equipment, trailer fabrication, truck body construction, and heavy framing assemblies. The fully threaded shank allows maximum thread engagement across the full 5-inch length, making it a practical choice when bolt length utilization matters. The bolt is sold in minimum order quantities of 5 units.

Key Features

• Grade 8 alloy steel construction for high tensile strength per SAE J429
• 3/8-16 UNC fully threaded shank, 5 inches length under head
• Square neck under head prevents spinning during nut tightening without a wrench on the bolt
• Zinc trivalent chromate finish for corrosion resistance
• Fully threaded shank maximizes thread engagement across entire length
• Inch measurement system, SAE J429 compliant

Compatibility

Designed as a standard UNC 3/8-16 carriage bolt for use with 3/8-16 hex nuts and appropriate flat or lock washers in structural and mechanical fastening applications.

Installation Notes

Installation of Grade 8 carriage bolts is typically performed by general contractors, millwrights, or equipment technicians using a standard socket or wrench on the nut side. The square neck must seat fully into a matching square hole or soft material to prevent bolt rotation before torque is applied. Always follow the applicable structural or equipment manufacturer specifications for torque requirements. Wear appropriate PPE when handling hardware in overhead or high-load assemblies.