Steel Pipe Unions | McMaster-Carr

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	Material Material

	For Pipe Material For Pipe Material

Steel

Brass

Iron

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

BSPT

	Type Type


Union	Connector

Adapter	Rotating Joint

	Finish Finish

Black Coated

Galvanized

Zinc-Phosphate Coated

Phosphate Coated

Zinc Plated

	For Pipe Schedule For Pipe Schedule


40	80

160	XXH

	For Use With For Use With

	Connection Style Connection Style

Threaded

Socket Connect

	Shape Shape


Straight	90° Elbow

	Pressure Class Pressure Class

	Connection Type Connection Type


Pipe	Tube

	Maximum Pressure Maximum Pressure

	System of Measurement System of Measurement

Inch

	Length Length

	Body Shape Body Shape


Hex	Hex with Lugs

	Maximum Steam Pressure Maximum Steam Pressure

	Gender Gender

Female

Male

	Hex Width Hex Width

	Specifications Met Specifications Met

International Fuel Gas Code

MSS

NSF/ANSI

Uniform Mechanical Code

UPC

	Gasket Material Gasket Material

Brass

Rubber

Graphite-Filled 304 Stainless
Steel

	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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216 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.

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.

Extreme-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Also known as Pressure Class 6000 fittings, these heavy duty forged fittings are the strongest steel fittings we offer.

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.

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.

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.

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.