Value Collection 93323 Carriage Bolt 3/8-16 1-1/2 in Square Neck

Product Description

The VALUE COLLECTION 93323 is a 3/8-16 carriage bolt with a 1-1/2 inch length under head, manufactured from Grade 18-8 stainless steel with an uncoated finish. Carriage bolts feature a smooth, domed head and a square neck that bites into wood or soft material to prevent rotation during installation, eliminating the need for a wrench on the bolt head. This fastener uses UNC (Unified National Coarse) threading and is measured by length under head per standard inch-system conventions. Grade 18-8 stainless steel provides corrosion resistance suitable for outdoor, marine-adjacent, or high-moisture environments. Electricians, plumbers, HVAC techs, and general tradespeople use these bolts to secure equipment, panels, brackets, and structural assemblies where corrosion resistance is a priority.

This carriage bolt is suited for light-to-medium fastening applications in residential and commercial construction, mechanical rooms, equipment mounting, and utility installations. The square neck design is particularly effective in wood substrates and thin metal applications where the bolt must remain stationary while the nut is driven. The uncoated stainless finish makes it appropriate for damp or corrosive environments without the need for additional protective coatings.

Key Features

• Grade 18-8 stainless steel construction for corrosion resistance in wet or outdoor environments
• 3/8-16 UNC thread for broad compatibility with standard nuts and hardware
• 1-1/2 inch length under head for precise fitment in standard fastening applications
• Square neck prevents bolt rotation during nut tightening without requiring a backup wrench
• Uncoated finish — no added plating that could flake, chip, or react with dissimilar metals
• Inch-system dimensioning for compatibility with standard SAE tooling and hardware

Compatibility

Designed as a standard inch-system carriage bolt compatible with 3/8-16 UNC hex nuts, flange nuts, and washers used in general mechanical, structural, and equipment-mounting applications.

Installation Notes

Installation is typically performed with a standard wrench or socket on the nut side only — the square neck seats into the substrate to hold the bolt stationary. Ensure the mating surface has an appropriate hole size to allow the square neck to seat fully and resist rotation. In structural or load-bearing applications, consult applicable building codes and use appropriate torque practices per the fastener grade. Minimum order quantity is 25 units per the manufacturer specification.