National Mfg N222-158 Zinc U-bolt 5/16x1-3/4x4-1/4 in

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N222-158 is a 526-series zinc U-bolt used to clamp, secure, and route pipe, conduit, and tubing in mechanical, plumbing, and HVAC applications. It measures 5/16 inches in diameter, 1-3/4 inches in inside width, and 4-1/4 inches in leg length. The zinc finish provides corrosion resistance suitable for general indoor and light-duty service installations. Sold in a bulk pack of 5 units per package, this U-bolt is a standard fastener stocked by plumbers, HVAC technicians, and pipefitters for everyday securing tasks.

This U-bolt is appropriate for securing round pipe or conduit runs to structural supports in residential and light commercial installations. Its dimensions make it well suited for clamping pipe in the common 1-1/4 inch to 1-1/2 inch nominal pipe range, though installers should verify actual pipe outer diameter against the 1-3/4 inch inside width before installation. Typical use cases include anchoring copper, steel, or PVC pipe to framing, hangers, unistrut, or equipment pads in mechanical rooms and utility spaces.

Key Features

• 5/16 inch diameter threaded rod legs for secure clamping and nut engagement
• 1-3/4 inch inside width accommodates common nominal pipe sizes
• 4-1/4 inch leg length provides clearance for insulated or oversized pipe
• Zinc finish for corrosion resistance in dry and light-duty environments
• Bulk pack of 5 units reduces per-unit cost for service stock
• 526-series designation for straightforward reorder and cross-reference

Compatibility

Designed as a general-purpose U-bolt for securing pipe, conduit, or tubing in mechanical, plumbing, and HVAC installations where a 5/16 inch by 1-3/4 inch by 4-1/4 inch zinc U-bolt is specified.

Installation Notes

Installation is typically performed by plumbers, pipefitters, or HVAC technicians using standard hand tools and wrenches. Shut off fluid flow and depressurize any associated piping before repositioning or replacing existing clamps. Verify that the inside width of the U-bolt clears the outer diameter of the pipe or conduit, including any insulation wrap, before tightening. Follow applicable IPC or IFGC support spacing requirements when anchoring pipe runs to structural members.