National N347-823 Zinc Round U Bolt 0.5x4x6.5 in

Product Description

The NATIONAL N347-823 is a zinc-plated round U bolt designed for securing pipe, conduit, and similar round stock to structural supports. The U bolt measures 0.5 inches in diameter with a 4-inch inside width and a 6.5-inch leg length, making it suitable for clamping medium-diameter pipe runs in a range of trade applications. The zinc plating provides baseline corrosion resistance for general indoor and light outdoor use. Plumbers, pipefitters, and mechanical contractors install this hardware type during pipe support and hanger installations.

This U bolt is used in residential and light commercial plumbing, HVAC piping, and conduit support work wherever round stock must be anchored to unistrut, timber, or structural steel. The 4-inch inside width accommodates mid-range pipe sizes typical in supply and drainage rough-in work. It is sold individually and is suited for new construction and retrofit applications where a standard round U bolt with matching nuts is required.

Key Features

• Zinc plating for corrosion resistance in general service environments
• Round bend profile conforms to pipe or conduit without point loading
• 0.5-inch bolt diameter for reliable clamping strength
• 4-inch inside width accommodates medium-diameter pipe and conduit runs
• 6.5-inch leg length provides adequate thread engagement with standard nuts
• Sold as a single unit for targeted replacement or small-quantity installs

Compatibility

Designed as an OEM-style replacement and general-use round U bolt for pipe, conduit, and round structural member support applications in plumbing and mechanical systems.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, or mechanical contractors following applicable IPC and IFGC support spacing requirements. Shut off fluid flow and depressurize the line before repositioning or replacing any pipe hanger hardware. Use appropriately sized nuts and washers rated for the load and environment. Do not overtighten, as excessive clamping force can deform plastic or thin-wall pipe.