UNF Bungs | McMaster-Carr

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213 Products

About Nuts, Materials, and Finishes

Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe—they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.

Threaded Round Plugs

Threaded Round Plugs for Straight-Thread Pipe

Seal tube and hose fittings to keep their straight threads protected from contaminants during fabrication and storage.

Threaded Round Plugs for 37° Flared Tube

Designed to fit into 37° flared connections such as those found on JIC and SAE fittings, these plugs protect internally threaded connections from contaminants during fabrication and storage.

Tube-End Weld Nuts

Weld these nuts to round uncoated metal tubes to attach threaded parts, such as rod ends.

Left-Hand Threaded Tube-End Weld Nuts

Use these tube-end weld nuts with left-hand threaded fasteners.

Weld Nuts

Steel Hex Weld Nuts

Weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold.

Stainless Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated stainless steel surfaces for a strong permanent hold.

Square Weld Nuts

Square weld nuts have more weld points than hex weld nuts for a stronger hold. Use them on flat surfaces.

Steel Round-Base Weld Nuts

A smooth base provides more contact with the mating surface than weld nuts with projections.

Stainless Steel Round-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Round-Base Weld Nuts with Projections

Projections on the base concentrate the weld and provide room for heat to dissipate.

Steel Narrow-Base Weld Nuts

Install threads in channels and other tight spaces where round-base weld nuts won’t fit.

Stainless Steel Narrow-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Steel Offset-Barrel Narrow-Base Weld Nuts

An offset barrel allows you to position threads near edges and corners.

Low-Profile Narrow-Base Weld Nuts with Projections

Projections on the base concentrate the weld and provide room for heat to dissipate.

Steel Low-Profile Narrow-Base Weld Nuts

With a slim base and a short barrel, these weld nuts fit in tight spaces, such as channels, and in low-clearance areas.

Stainless Steel Offset-Barrel Narrow-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Aligning Weld Nuts

Threads float inside the retainer so you can install a bolt at a slight angle to align with off center parts.