Weld Bungs | McMaster-Carr

	Material Material

Steel

Stainless Steel

Aluminum

	Pipe Size Pipe Size

	Thread Type Thread Type

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	For Pipe Material For Pipe Material

Stainless Steel

Steel

Aluminum

	Connection Style Connection Style

Threaded

Butt Weld

Socket Connect

	For Use With For Use With

	Pressure Class Pressure Class

	Length Length

	For Pipe Schedule For Pipe Schedule


40	80

160	XXH

	Specifications Met Specifications Met

	For Tank Surface For Tank Surface

Flat

Curved

	Nut Type Nut Type


Tube End	Weld

Flange	Hex

Square

	For Hole Diameter For Hole Diameter

	Maximum Pressure Maximum Pressure

	OD OD

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	For Tube OD For Tube OD

	Weld Nut Shape Weld Nut Shape

	Round
	Hex
	Rectangular
	Square
	Rectangular with Floating Nut

	Tank Adapter Style Tank Adapter Style

With Extension

Without Extension

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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560 Products

About Nuts, Materials, and Finishes

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

High-Pressure Galvanized Steel Threaded Pipe Fittings

A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings.

Extreme-Pressure Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slide the pipe into the socket and weld.

Stainless Steel Pipe and Pipe Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these corrosion-resistant fittings in a low-pressure pipe line.

Medium-Pressure Stainless
Steel Threaded Pipe Fittings

Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty, corrosion-resistant fittings in high-pressure flow applications.

High-Pressure Socket-Connect
Stainless Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slip the pipe into the socket and weld.

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications.

Tube-End Weld Nuts

About half the strength of medium-strength steel coupling nuts, these metric nuts are for light duty fastening applications.

Left-Hand Threaded Tube-End Weld Nuts

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

Weld Nuts

Metric Steel Hex Weld Nuts

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

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.

Metric Stainless Steel Hex Weld Nuts

You can weld these metric 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.

Metric Steel Round-Base Weld Nuts

A smooth base on these metric nuts 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

These nuts can be used in channels and tight spaces where round-base weld nuts won't fit.

Metric Steel Narrow-Base Weld Nuts

Use these metric nuts in channels and tight spaces where round-base weld nuts won't fit.

Stainless Steel Narrow-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Low-Profile Narrow-Base Weld Nuts

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

Low-Profile Narrow-Base Weld Nuts with Projections

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

Stainless Steel Offset-Barrel Narrow-Base Weld Nuts

Weld these nuts to stainless steel surfaces.

Steel Offset-Barrel Narrow-Base Weld Nuts

Weld these nuts to uncoated 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.

Metric Aligning Weld Nuts

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