National Mfg N222-166 Zinc U-bolt 5/16x2x3-1/4 in

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N222-166 is a zinc-plated U-bolt designed for securing pipe, conduit, tubing, or other round stock to a flat mounting surface. Measuring 5/16 inches in thread diameter with a 2-inch inside width and 3-1/4-inch leg length, this fastener provides a reliable clamp point in applications where corrosion resistance and dimensional accuracy matter. The zinc finish offers basic protection against rust in dry to mildly damp environments. It is sold in a bulk pack of 5 units per package, making it practical for service vehicles and job-site stock.

This U-bolt suits residential and light commercial installation work across plumbing, electrical, HVAC, and general mechanical trades. It is commonly used to anchor pipe runs, secure conduit to unistrut or wood framing, and fasten tubing in tight routing conditions. The 5/16-inch thread size is compatible with standard hex nuts and washers of the same thread pitch, simplifying sourcing on multi-trade job sites.

Key Features

• Zinc plating provides corrosion resistance for indoor and sheltered outdoor use
• 5/16-inch thread diameter accepts standard hardware-store nuts and washers
• 2-inch inside width accommodates common pipe and conduit sizes
• 3-1/4-inch leg length allows adequate thread engagement and clearance
• Bulk pack of 5 units supports stocking and multi-point installations

Compatibility

Designed as a general-purpose zinc U-bolt for use with pipe, conduit, and round tubing in standard residential and light commercial fastening applications.

Installation Notes

U-bolts of this type are typically installed by plumbers, electricians, and HVAC technicians during pipe and conduit support work. Secure with appropriately rated hex nuts and flat washers, and tighten to snug without over-torquing, which can distort the bend radius or strip the threads. Confirm that the mounting surface and fastener material are compatible with the environment to avoid galvanic corrosion. Follow applicable code requirements such as IPC, IMC, or NEC for support spacing and fastener type.