Gibraltar GIB51545 Round U-bolt 1/2-13 Unc 3-1/2 in Pipe

Product Description

The GIBRALTAR GIB51545 is a round U-bolt designed to secure pipe, conduit, and similar round stock to structural supports in mechanical, plumbing, and industrial piping systems. Built from C-1010 steel with a zinc-plated finish for corrosion resistance, this fastener uses a 1/2-13 UNC thread with a 3-inch thread length, providing ample engagement for standard hex nuts. The U-bolt ships without a mount plate, making it suitable for applications where the installer supplies their own backing hardware or mounts directly to a strut or structural member. Four nuts are included. Weight is 0.82 pounds per unit.

This U-bolt is sized for 3-1/2 inch pipe and carries a 4-1/16 inch inside width to clear standard Schedule 40 and Schedule 80 pipe of that nominal diameter. Typical install scenarios include pipe hanger assemblies in mechanical rooms, boiler rooms, plumbing rough-in, and HVAC refrigerant or hydronic piping support runs. Plumbers, pipefitters, and mechanical contractors are the primary installers. The zinc-plated steel construction suits indoor and semi-protected environments where moderate corrosion resistance is required.

Key Features

• 1/2-13 UNC thread for compatibility with standard hex hardware
• 3-inch thread length provides full nut engagement on typical pipe hanger assemblies
• 4-1/16 inch inside width fits 3-1/2 inch nominal pipe
• C-1010 steel construction with zinc-plated finish for corrosion resistance
• Ships without mount plate for flexible backing configurations
• Includes four nuts — no additional hardware required for basic installation

Compatibility

Designed as an OEM-style replacement and standard-fit U-bolt for 3-1/2 inch nominal pipe support applications using 1/2-13 UNC threaded hardware.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, or mechanical contractors following applicable IPC or IFGC support-spacing requirements. Shut off flow and depressurize the line before repositioning any existing pipe hangers. Torque nuts evenly to avoid cocking the U-bolt across the pipe. Do not overtighten on plastic-lined or thin-wall pipe without appropriate cushioning inserts.