Threaded Pipe Unions | McMaster-Carr

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	Connection Style Connection Style	Show

Threaded

	Connection Style Connection Style	Hide

	Type Type


Union	Connector

Adapter	Rotating Joint

	Pipe Size Pipe Size

	Thread Type Thread Type

	Material Material

	For Pipe Schedule For Pipe Schedule


40	80

160	XXH

	For Use With For Use With

	Shape Shape


Straight	90° Elbow

	For Pipe Material For Pipe Material

	Pressure Class Pressure Class

	Connection Type Connection Type


Pipe	Tube

	Gender Gender

Female

Male

	Maximum Pressure Maximum Pressure

	System of Measurement System of Measurement

Inch

Metric

	Length Length

	Finish Finish

Black Coated

Galvanized

Zinc-Phosphate Coated

Chrome Plated

Phosphate Coated

Zinc Plated

	Body Shape Body Shape

	Maximum Steam Pressure Maximum Steam Pressure

	Hex Width Hex Width

	Specifications Met Specifications Met

International Fuel Gas
Code

MSS

NSF/ANSI

SAE

Uniform Mechanical Code

UPC

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

REACH Compliant

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

DFARS Specialty Metals
COTS-Exempt

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543 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Medium-Pressure Iron and Steel Threaded Pipe Fittings

For use in noncorrosive environments, these fittings have better strength than our low-pressure iron and steel pipe fittings.

Medium-Pressure Pipe Fittings
for Joining Dissimilar Metals

Use these unions to connect different metals in a piping or plumbing system. They have a gasket with a plastic sleeve that inhibits destructive corrosion.

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

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.

Low-Pressure Press-Connect
Steel Unthreaded Pipe Fittings

Crimp these fittings onto steel pipe to form a tightly sealed connection that’s faster than threading or welding and doesn’t require heat.

Stainless Steel Threaded Pipe and Pipe Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

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

Premium Low-Pressure Stainless Steel
Threaded Pipe Fittings with Certification

Unlike other stainless steel fittings, these are made in the U.S.A. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition.

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.

Precision Extreme-Pressure Stainless
Steel Threaded Pipe Fittings

These fittings are made to tighter tolerances than other stainless steel pipe fittings. They are also known as instrumentation fittings.

Brass and Bronze Threaded Pipe and Pipe Fittings

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance.

Low-Pressure Plated Brass Threaded Pipe Fittings

Used in low-pressure pipe lines, these brass fittings have a plating that makes them shiny and improves corrosion resistance.

High-Pressure Brass Threaded Pipe Fittings

These brass fittings have the strength to handle high-pressure applications.

High-Pressure Brass Threaded
Pipe Fittings for Drinking Water

Use these heavy-duty brass fittings for high-pressure drinking water applications.

Medium-Pressure Brass and
Bronze Threaded Pipe Fittings

Choose these fittings when you need better strength than our low-pressure brass and bronze pipe fittings.

Aluminum Threaded Pipe and Pipe Fittings

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.

High-Pressure Aluminum Threaded Pipe Fittings

Also known as Pressure Class 3000 fittings, these have the highest pressure rating of all the aluminum pipe fittings we offer.

Plastic Pipe and Pipe Fittings

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to thick-wall plastic pipe—they have thicker, stronger walls than standard-wall fittings, so they can handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. They can withstand pressures up to 900 psi.

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.

CPVC Pipe Fittings for Hot Water

Connect to CPVC pipe for use in high-temperature plumbing and water supply applications up to 200° F.

Flame-Retardant PVDF Pipe Fittings for Chemicals

These PVDF fittings meet UL 94 V-0 for flame retardance, so they delay the spread of flames to valuable equipment. PVDF is comparable to Kynar, and has the chemical resistance to stand up to solvents and other harsh substances.

Crack-Resistant PFA Pipe Fittings for Chemicals

Not only do these PFA fittings have the chemical resistance to handle acid and salt water, they also have better crack resistance than other plastic pipe fittings for chemicals. They are commonly used in high-purity chemical flow processes, such as semiconductor and clean room applications.

Rotating Joints

Stainless Steel One-Way-Flow Rotating Joints

Joints are for one-way flow and are stainless steel for excellent resistance to corrosion caused by fluid flowing through them.

Brass One-Way-Flow Rotating Joints

Joints are for one-way flow and are brass for good corrosion resistance.

Iron and Steel One-Way-Flow Rotating Joints

Joints are for one-way flow and are meant to be used in pairs—one joint serves as the supply line while the other serves as the return line.

Stainless Steel Two-Way-Flow Rotating Joints

Joints are for two-way flow and are stainless steel for excellent resistance to corrosion caused by fluid flowing through them.

Iron Two-Way-Flow Rotating Joints

Joints are for two-way flow and are meant to be used when you need the supply line and the return line to be on the same side of your equipment.

Brass Two-Way-Flow Rotating Joints

Joints are for two-way flow and are brass for good corrosion resistance.

Press-Connect Fittings for Copper Tubing

Crimp these fittings to copper tubing with a crimping tool for a leak-tight connection that doesn’t require heat or soldering. They are comparable to Viega ProPress fittings.

How to Identify and Measure Fittings

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Medium-Pressure Iron and Steel Threaded Pipe Fittings

Medium-Pressure Pipe Fittingsfor Joining Dissimilar Metals

Medium-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

High-Pressure Iron and Steel Threaded Pipe Fittings

High-Pressure Galvanized Steel Threaded Pipe Fittings

Extreme-Pressure Steel Threaded Pipe Fittings

Low-Pressure Press-ConnectSteel Unthreaded Pipe Fittings

Stainless Steel Threaded Pipe and Pipe Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

Premium Low-Pressure Stainless SteelThreaded Pipe Fittings with Certification

Medium-Pressure StainlessSteel Threaded Pipe Fittings

High-Pressure Stainless Steel Threaded Pipe Fittings

Precision Extreme-Pressure StainlessSteel Threaded Pipe Fittings

Brass and Bronze Threaded Pipe and Pipe Fittings

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Low-Pressure Plated Brass Threaded Pipe Fittings

High-Pressure Brass Threaded Pipe Fittings

High-Pressure Brass ThreadedPipe Fittings for Drinking Water

Medium-Pressure Brass andBronze Threaded Pipe Fittings

Aluminum Threaded Pipe and Pipe Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

High-Pressure Aluminum Threaded Pipe Fittings

Plastic Pipe and Pipe Fittings

Thick-Wall Plastic Pipe Fittings for Water

Standard-Wall Plastic Pipe Fittings for Water

CPVC Pipe Fittings for Hot Water

Flame-Retardant PVDF Pipe Fittings for Chemicals

Crack-Resistant PFA Pipe Fittings for Chemicals

Rotating Joints

Stainless Steel One-Way-Flow Rotating Joints

Brass One-Way-Flow Rotating Joints

Iron and Steel One-Way-Flow Rotating Joints

Stainless Steel Two-Way-Flow Rotating Joints

Iron Two-Way-Flow Rotating Joints

Brass Two-Way-Flow Rotating Joints

Press-Connect Fittings for Copper Tubing

Press-Connect Fittings for Copper Tubing

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Medium-Pressure Pipe Fittings
for Joining Dissimilar Metals

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Low-Pressure Press-Connect
Steel Unthreaded Pipe Fittings

Premium Low-Pressure Stainless Steel
Threaded Pipe Fittings with Certification

Medium-Pressure Stainless
Steel Threaded Pipe Fittings

Precision Extreme-Pressure Stainless
Steel Threaded Pipe Fittings

High-Pressure Brass Threaded
Pipe Fittings for Drinking Water

Medium-Pressure Brass and
Bronze Threaded Pipe Fittings