Gibraltar GIB51020 Square U-bolt 3/8-16 Unc 4 Inch Steel

Product Description

The GIBRALTAR GIB51020 is a square U-bolt designed for securing pipe, conduit, and structural members to a mounting surface. Formed from C-1010 steel with a zinc-plated finish for corrosion resistance, this U-bolt features a 3/8-16 UNC thread standard with a 1.5-inch thread length. The square profile spans 4 inches in width and 3 inches in length, making it well-suited for clamping applications that require a fixed, non-round profile. Hardware is included: each unit ships with two nuts and two washers, providing everything needed for a complete installation. Licensed tradespeople working in HVAC, plumbing, electrical, and mechanical contracting routinely use square U-bolts for pipe and conduit support in both new construction and retrofit work.

This U-bolt is appropriate for use in residential and light commercial mechanical installations where pipe or conduit must be anchored to framing, unistrut, or structural steel. The 4-inch interior width accommodates correspondingly sized pipe or bundle runs. The zinc-plated C-1010 steel construction holds up in dry interior environments and is a common choice for standard support applications in mechanical rooms, utility spaces, and equipment pads.

Key Features

• Square profile with 4-inch interior width for secure pipe and conduit clamping
• 3/8-16 UNC thread with 1.5-inch thread length for positive nut engagement
• C-1010 steel construction with zinc-plated finish for corrosion resistance
• Ships with two nuts and two washers — no separate hardware order required
• Inch measurement system; fits standard imperial pipe and conduit sizes
• No mount plate included — designed for direct application to strut or structural surfaces

Compatibility

Designed as an OEM-style replacement or standard installation U-bolt for pipe, conduit, and structural clamping applications requiring a 3/8-16 UNC fastener with a 4-inch square profile.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, electricians, or mechanical contractors. Before installing, ensure all systems being secured are de-energized or depressurized as required by applicable codes, including NEC and IPC guidelines for support spacing. Use appropriately rated wrenches to seat the nuts evenly on both threaded legs — advance each nut incrementally and alternately to maintain even clamping force. Do not overtighten, as excessive torque can distort the U-bolt profile or damage the pipe or conduit wall.