National Marker N222109 Zinc Round U Bolt

Product Description

The NATIONAL MARKER N222109 is a zinc-plated round U bolt designed for hanging and fastening applications across plumbing, automotive, and general industrial use. Part of the National catalog 2190 series, this U bolt measures 0.25 inches in rod diameter, 1.125 inches in inside width, and 3.5 inches in thread length. It ships with a plate and two hex nuts included. The zinc finish provides corrosion resistance suitable for light-duty indoor and outdoor environments. Licensed tradespeople and skilled DIYers install this hardware wherever a secure, removable pipe or structural clamp is needed without welding or permanent fastening.

This U bolt is well suited for securing pipe runs in plumbing rough-in work, mounting exhaust or fuel lines in automotive repair, and general-purpose strapping of conduit, hose, or rod stock to structural members. The listed pipe size refers to the inside diameter of standard pipe, so technicians should match the 1.125-inch inside width to the outside diameter of the pipe being clamped when selecting this part. It is sold individually with hardware included.

Key Features

• Zinc-plated steel construction for corrosion resistance in light-duty applications
• Plate and two hex nuts included — no separate hardware purchase needed
• Round-bend profile distributes clamping load evenly around pipe OD
• Suitable for pipe, wood, and structural fastening in plumbing, automotive, and industrial settings
• Part of the National 2190 catalog series for consistent cross-reference ordering

Compatibility

Designed as an OEM-style replacement and general-purpose U bolt for use on standard pipe, conduit, and structural members where a 0.25-inch rod diameter, 1.125-inch inside width round U bolt is specified.

Installation Notes

Installation is performed by plumbers, HVAC technicians, electricians, and automotive technicians depending on the application. Always de-energize, depressurize, or drain the system before securing or repositioning pipe clamps. Hand-tighten the hex nuts evenly before applying a wrench to avoid cocking the plate. Do not overtighten on thin-wall or plastic-lined pipe, as the round U bolt concentrates load at the bend point.