National Marker N222117 Zinc Round U Bolt Pipe Fastener

Product Description

The NATIONAL MARKER N222117 is a zinc-plated round U bolt from the National 2190 series, designed for hanging and fastening applications across pipe, wood, and structural supports. Measuring 0.25 inches in thread diameter, 1.375 inches in inside width, and 4 inches in length, this U bolt ships with plate and hex nuts included for a complete installation. The zinc plating provides corrosion resistance suitable for both indoor and light-duty outdoor environments. At 0.146 pounds, it is a compact, lightweight fastener appropriate for a wide range of trade and maintenance tasks.

This U bolt is suited for automotive, plumbing, and general industrial applications where pipe or structural fastening is required. The inside width dimension corresponds to the inside diameter of standard pipe, making it straightforward to match to the correct pipe size during installation. It is commonly used by plumbers, maintenance technicians, and mechanical contractors for pipe hanging, exhaust system mounting, and general utility fastening on jobsites and in facilities.

Key Features

• Zinc plating for corrosion resistance in typical indoor and light outdoor environments
• Round bend profile for secure, consistent contact around pipe and round stock
• Plate and hex nuts included — no additional hardware required
• Thread diameter of 0.25 inches with 4 inches of usable bolt length
• Inside width of 1.375 inches matches standard pipe inside diameter sizing
• Suitable for automotive, plumbing, and general industrial fastening tasks

Compatibility

Designed for use with standard pipe where the listed inside width corresponds to the inside diameter of standard pipe. Appropriate for pipe hanging, exhaust mounting, and general fastening to pipe, wood, and similar structural materials in automotive, plumbing, and industrial settings.

Installation Notes

Power down or depressurize any system before installing or replacing pipe fasteners. Apply fasteners per applicable mechanical and plumbing codes, including IPC guidelines where relevant. Use appropriately sized wrenches to seat the hex nuts evenly against the plate without over-torquing the threaded rod. Inspect the zinc coating for damage before installation — compromised plating reduces corrosion resistance in wet or humid environments.