National Marker N222166 Zinc Round U Bolt 5/16x2x3-1/4 in

Product Description

The NATIONAL MARKER N222166 is a zinc-plated round U bolt designed for hanging and fastening applications across automotive, plumbing, and general industrial settings. The bolt measures 5/16 inch in diameter, 2 inches in width, and 3-1/4 inches in length, making it a compact, versatile fastener suited for securing pipe, tubing, wood, and similar substrates. Constructed from steel with a zinc finish for corrosion resistance, the N222166 ships with plate and hex nuts included, so the installer has everything needed for a complete mount. Plumbers, HVAC technicians, and general contractors are the primary installers.

This U bolt is built for use on pipe, round stock, and structural members in both residential and light commercial environments. Pipe size compatibility references the inside diameter of standard pipe. The zinc finish makes it appropriate for dry and mildly damp indoor environments such as mechanical rooms, garages, and utility spaces. Its small footprint and included hardware make it practical for tight installations where a full clamp assembly would be oversized.

Key Features

• 5/16 inch diameter rod with 2 inch x 3-1/4 inch overall dimensions
• Zinc-plated steel construction for corrosion resistance in indoor environments
• Round-bend profile suited for pipe and round-stock fastening
• Plate and hex nuts included for complete installation without additional hardware
• Suitable for automotive, plumbing, HVAC, and general industrial applications
• Sold individually; minimum order quantity of 5 units

Compatibility

Designed for use on standard pipe where the listed pipe sizes reference inside diameters. Suitable for fastening to pipe, wood, and similar substrates in automotive, plumbing, and industrial applications per the manufacturer specification.

Installation Notes

Shut off fluid flow and depressurize any pipe before installing or repositioning U bolt clamps. This fastener is typically installed by plumbers, HVAC mechanics, or general contractors using standard hand tools. Verify that the pipe or substrate outside diameter falls within the U bolt opening before tightening the hex nuts to avoid deforming the pipe wall. Follow applicable IPC and local mechanical codes for pipe support spacing and fastener requirements.

Technical Specifications

• Rod Diameter: 5/16 inches
• Width: 2 inches
• Length: 3-1/4 inches
• Material: Steel
• Finish: Zinc plated
• Included Hardware: Plate and hex nuts
• Weight: 0.195 pounds
• Minimum Order Quantity: 5
• UPC: 00038613126039

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N222166