National Marker N347-831 Zinc Round U-bolt

Product Description

The NATIONAL MARKER N347-831 is a zinc-plated round U-bolt designed for hanging, supporting, or fastening to pipe, wood, or other structural materials. The U-bolt features 1/2-inch threaded ends, a 4-1/2-inch inside width, and a 7-inch leg length, making it suitable for securing medium-diameter pipe runs or mounting applications. A mounting plate and hex nuts are included, providing a complete fastening assembly out of the package. The zinc finish offers basic corrosion resistance for general-purpose indoor and light-duty outdoor use. Installation requires no special tooling beyond standard hand tools.

This U-bolt is used across automotive, plumbing, HVAC, and general industrial applications where pipe or conduit must be secured to a structural surface. It is appropriate for both residential and light commercial installations. The included plate and hardware make it ready to install in pipe hanger configurations, support brackets, or strap-style mounting setups on wood framing or structural steel.

Key Features

• Zinc-plated finish for general corrosion resistance in dry and light-moisture environments
• Round-bend profile seats evenly against round pipe or tube stock
• 1/2-inch threaded ends accept standard hex nuts for secure clamping
• Includes mounting plate and hex nuts — no additional hardware required
• Suitable for pipe hanging, fastening, and support applications across multiple trades

Compatibility

Designed as a general-purpose round U-bolt for pipe hanging and fastening applications in automotive, plumbing, and industrial settings where 1/2-inch threaded U-bolt hardware is required.

Installation Notes

Installation is performed by plumbers, pipefitters, HVAC technicians, or general tradespeople depending on the application. Ensure the pipe or mounting surface is properly supported before tightening the hex nuts. Hand-tighten the plate and nuts evenly on both legs to avoid cocking the bracket, then bring to snug with a wrench. Do not overtighten on plastic pipe or soft materials, as the round bend can deform the substrate.

Technical Specifications

• Thread Size: 1/2 inch
• Inside Width: 4-1/2 inches
• Leg Length: 7 inches
• Finish: Zinc plated
• Bend Style: Round
• Included Hardware: Mounting plate and hex nuts
• Weight: 1.049 pounds
• Sold As: Each

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N347-831