Gibraltar GIB53137 Round U-bolt 18 in Pipe 1-8 Unc Galvanized

Product Description

The GIBRALTAR GIB53137 is a heavy-duty round U-bolt designed to secure 18-inch pipe to structural supports without a mount plate. Manufactured from C1010 steel with a hot-dipped galvanized finish, this U-bolt delivers corrosion resistance suited for outdoor, underground, or wet-environment pipe support applications. The 1-8 UNC thread standard provides a coarse thread profile for reliable fastening under load. At 12.45 pounds, this is a substantial fastener built for large-diameter pipe runs in industrial, commercial, and municipal piping systems. Each unit ships with two nuts included, making it ready for installation without additional hardware sourcing.

This U-bolt is intended for use with 18-inch nominal pipe in plumbing, mechanical, and process-piping installations where a round-profile clamp without an integrated mount plate is required. Typical applications include pipe hangers on structural steel, concrete inserts, or threaded rod assemblies in large-diameter water, waste, or industrial process lines. The hot-dipped galvanized coating makes it appropriate for corrosive or high-moisture environments. Licensed plumbers, pipefitters, and mechanical contractors working on commercial and industrial projects are the primary installers for a fastener of this size class.

Key Features

• Round U-bolt profile sized for 18-inch nominal pipe with an 18-1/8 inch internal width
• 1-8 UNC coarse thread for secure nut engagement under load and vibration
• 4-3/4 inch thread length provides adequate engagement depth for structural pipe support assemblies
• Hot-dipped galvanized C1010 steel construction for corrosion resistance in wet and outdoor environments
• 21-11/16 inch overall length accommodates standard structural attachment configurations
• Includes two nuts — no additional hardware required for basic installation

Compatibility

Designed as an OEM-style pipe support fastener for 18-inch nominal pipe in commercial and industrial mechanical, plumbing, and process-piping support systems.

Installation Notes

Installation of large-diameter pipe support hardware of this class is typically performed by licensed plumbers or pipefitters in accordance with applicable codes such as the IPC or ASME B31 piping standards. Depressurize and drain the piping system before disturbing existing supports or repositioning pipe. Use appropriate torque wrenches and fastener lubricant to achieve even nut seating on both threaded legs. Do not overtighten, as uneven loading across the U-bolt legs can distort the pipe or damage the support structure.