National Mfg N222-356 Square U-bolt 5/16x2x3 Zinc 5-pack

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N222-356 is a zinc-plated square U-bolt supplied in a 5-piece boxed pack. Each U-bolt measures 5/16 inches in diameter with a 2-inch width and 3-inch leg length, and ships with plate and hex nuts already attached for straightforward installation. The square bend profile provides a flush, stable bearing surface against flat stock, making it well suited for clamping pipes, conduit, strut, or structural members to rectangular wood or metal substrates. Plumbers, pipefitters, electricians, and general contractors reach for this fastener when a round U-bolt would not seat properly against flat or square-section material.

This U-bolt is commonly used in light commercial and residential mechanical work where pipe runs, conduit bundles, or equipment supports must be anchored to wood framing, steel channel, or flat bar. The included plate and hex nuts allow the installer to complete the connection without sourcing additional hardware. The zinc coating provides basic corrosion resistance suitable for dry or mildly damp indoor environments. Each package contains 5 fasteners, making it practical for jobs requiring multiple attachment points along a run.

Key Features

• Square bend profile seats flush against rectangular wood and metal surfaces
• Plate and hex nuts included — no additional hardware required
• Zinc finish provides corrosion resistance for indoor and sheltered applications
• 5/16 inch rod diameter for moderate clamping loads
• 5-piece pack supports multi-point installations
• Boxed loose for easy handling and jobsite storage

Compatibility

Designed for securing pipes, conduit, strut, or structural members to rectangular wood and metal objects where a square U-bolt profile is required.

Installation Notes

Installation is typically performed by plumbers, pipefitters, or electricians as part of pipe or conduit support runs. Verify that the clamped material diameter or width falls within the U-bolt opening before tightening. Hand-snug the hex nuts evenly on both legs before final tightening to keep the plate square against the mounting surface. Follow applicable code requirements — such as IPC or NEC support spacing guidelines — for the pipe or conduit type being secured.