Value Collection 215617MSC Carriage Bolt 3/8-16 4 in Grade 8

Product Description

The VALUE COLLECTION 215617MSC is a Grade 8 alloy steel carriage bolt with a 3/8-16 UNC thread and a 4-inch length under head. The square neck under the domed head resists rotation during installation, eliminating the need for a wrench on the bolt side. A zinc trivalent chromate finish provides corrosion resistance for use in demanding environments. These fully threaded fasteners are suited for structural and mechanical assembly applications where high-strength, reliable clamping is required. Each bolt meets SAE J429 standards, confirming Grade 8 mechanical property requirements.

These carriage bolts are used in heavy-duty structural connections, equipment mounting, and general fabrication work. The 3/8-16 UNC thread is a common size across trade and industrial applications including HVAC equipment mounting, electrical enclosure assembly, and mechanical support structures. The square neck seats into pre-drilled square holes in wood or soft metal, holding the bolt stationary while the nut is tightened from the opposite side.

Key Features

• Grade 8 alloy steel construction for high tensile and shear strength
• 3/8-16 UNC fully threaded at 4 inches under head
• Square neck under domed head prevents rotation during assembly
• Zinc trivalent chromate finish for corrosion protection
• Meets SAE J429 fastener standard
• Sold in multiples of 5 per order

Compatibility

Designed as a standard 3/8-16 UNC Grade 8 carriage bolt suitable for structural, mechanical, and equipment mounting applications requiring SAE J429-compliant fasteners.

Installation Notes

Carriage bolts are typically installed by tradespeople and general mechanics using standard hand tools. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and resist rotation, then secure with an appropriate nut and washer from the opposite side. Torque to values specified by the joint design engineer or applicable structural code. Always ensure the mating surface material is rated for Grade 8 fastener loads before installation.