Steel Pipe Flanges | McMaster-Carr

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	Material Material

	For Pipe Material For Pipe Material

	Pipe Size Pipe Size

1/16
1/8
1/4
3/8
1/2
5/8
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12

	Type Type


Flange	Adapter

Reducing Adapter	Cap

Connector	Stub End

Reducer	Bushing

Union	Outlet

Saddle Tap

	Connection Style Connection Style

	Pressure Class Pressure Class

	For Pipe Schedule For Pipe Schedule

160

XXH

Any

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

O-Ring Groove

	Number of Bolt Holes Number of Bolt Holes

	System of Measurement System of Measurement

Inch

Metric

	Flange OD Flange OD

	For Use With For Use With

	Thread Type Thread Type

UN/UNF (SAE Straight)

	Shape Shape


Straight	Cap/Plug

90° Elbow	Tee

45° Elbow	Cross

Wye	180° Bend

	Bolt Circle Diameter Bolt Circle Diameter

	Maximum Steam Pressure Maximum Steam Pressure

	Specifications Met Specifications Met

International Fuel Gas
Code

Uniform Mechanical Code

UPC

	Connection Type Connection Type


Pipe	Tube

	For Bolt Diameter For Bolt Diameter

	Bolt Hole Diameter Bolt Hole Diameter

	Maximum Pressure Maximum Pressure

	Gender Gender

Female

Male

	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

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3,677 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 Steel Threaded Pipe Flanges

These flanges are for low-pressure applications in noncorrosive environments.

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

FM-Approved Low-Pressure Cast
Iron Threaded Pipe Flanges

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Fittings

Low-Pressure Cast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Steel Threaded Pipe Flanges

The galvanized finish on these Pressure Class 150 flanges provides fair corrosion resistance.

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.

Low-Pressure Galvanized Steel
Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection.

Medium-Pressure Iron and Steel Threaded Pipe and Pipe Fittings

Medium-Pressure Steel Threaded Pipe Flanges

With better strength than our low-pressure steel flanges, these are for use in medium-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 Galvanized
Steel Threaded Pipe Flanges

Also known as Pressure Class 300 flanges, these medium-pressure flanges have a galvanized finish for fair corrosion resistance.

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 and Pipe Fittings

High-Pressure Steel Threaded Pipe Flanges

Also known as Pressure Class 1500 steel flanges, these have the strength to handle high pressures.

High-Pressure Steel Threaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

High-Pressure Steel Threaded
SAE Two-Piece Pipe Flanges

Combine an adapter with a two-piece pipe flange (sold separately) to build a customized flange connection for 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 and Pipe Fittings

Compact Extreme-Pressure
Steel Threaded Pipe Fittings

These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces.

Compact Precision Extreme-Pressure
Steel Threaded Pipe Fittings

Made to tighter tolerances than other steel pipe fittings, these are also known as instrumentation fittings.

Extreme-Pressure Steel Threaded Pipe Fittings

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

Iron and Steel Unthreaded Pipe and Pipe Fittings

Low-Pressure Steel Unthreaded Pipe Flanges

Bolt two flanges of the same size together with a gasket to create an access point in a pipe line.

Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

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.

High-Pressure Steel Unthreaded Pipe Flanges

Forged for extra strength, these heavy duty unthreaded flanges can withstand high-pressure applications.

High-Pressure Steel Unthreaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

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.

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Extreme-Pressure Steel Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges.

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.

Iron and Steel Pipe Fittings with Flanged Ends

Bolt the flanged end of these fittings to another same-size flange, pump, or valve with a gasket to create an access point in a pipe line.

Plastic Pipe and Pipe Fittings for Water

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.

Clamp-On Connectors

Low-Pressure Clamp-On Connectors
for Drain, Waste, and Vent

Cut-to-Length Low-Pressure Clamp-On
Connectors for Drain, Waste, and Vent

Connect two pipes that are up to 100 feet apart—cut the connector to the length you need and attach a clamp to each end.

Low-Pressure Quick-Lock Clamp-On Connectors for Air

A turn of the T-handle will tighten and loosen these connectors, so you can quickly disassemble and reassemble your lines without tools.

Low-Pressure Clamp-On Connectors for Air

These connectors are for use in low-pressure air and vacuum conveying systems, as well as in gravity-flow systems.

Low-Pressure Clamp-On Connectors for Water

Also known as no-hub couplings, these have a one-piece sleeve with a stop in the center, so you know your pipe is always aligned correctly.

Medium-Pressure Clamp-On Connectors

Use in medium-pressure applications up to 230 psi.

High-Pressure Clamp-On Connectors

Use in high-pressure applications up to 500 psi.

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.

Toilet Mounting Flanges

Pipe Suction Flanges for Hydraulic Tanks

Seal pipes passing through the top plate of a hydraulic tank.

How to Identify and Measure Fittings

Low-Pressure Iron and Steel Threaded Pipe and Pipe Fittings

Low-Pressure Steel Threaded Pipe Flanges

Low-Pressure Iron and Steel Threaded Pipe Fittings

FM-Approved Low-Pressure CastIron Threaded Pipe Flanges

FM-Approved Low-PressureCast Iron Threaded Pipe Fittings

Low-Pressure Cast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Steel Threaded Pipe Flanges

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Low-Pressure Galvanized SteelThreaded Pipe Fittings with Sealant

Medium-Pressure Iron and Steel Threaded Pipe and Pipe Fittings

Medium-Pressure Steel Threaded Pipe Flanges

Medium-Pressure Iron and Steel Threaded Pipe Fittings

Medium-Pressure GalvanizedSteel Threaded Pipe Flanges

Medium-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

High-Pressure Iron and Steel Threaded Pipe and Pipe Fittings

High-Pressure Steel Threaded Pipe Flanges

High-Pressure Steel Threaded SAE Pipe Flanges

High-Pressure Steel ThreadedSAE Two-Piece Pipe Flanges

High-Pressure Iron and Steel Threaded Pipe Fittings

High-Pressure Galvanized Steel Threaded Pipe Fittings

Extreme-Pressure Steel Threaded Pipe and Pipe Fittings

Compact Extreme-PressureSteel Threaded Pipe Fittings

Compact Precision Extreme-PressureSteel Threaded Pipe Fittings

Extreme-Pressure Steel Threaded Pipe Fittings

Iron and Steel Unthreaded Pipe and Pipe Fittings

Low-Pressure Steel Unthreaded Pipe Flanges

Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Low-Pressure Press-ConnectSteel Unthreaded Pipe Fittings

High-Pressure Steel Unthreaded Pipe Flanges

High-Pressure Steel Unthreaded SAE Pipe Flanges

High-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Extreme-Pressure Steel Unthreaded Pipe Flanges

Extreme-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Iron and Steel Pipe Fittings with Flanged Ends

Iron and Steel Pipe Fittings with Flanged Ends

Plastic Pipe and Pipe Fittings for Water

Thick-Wall Plastic Pipe Fittings for Water

Standard-Wall Plastic Pipe Fittings for Water

Clamp-On Connectors

Low-Pressure Clamp-On Connectorsfor Drain, Waste, and Vent

Cut-to-Length Low-Pressure Clamp-OnConnectors for Drain, Waste, and Vent

Low-Pressure Quick-Lock Clamp-On Connectors for Air

Low-Pressure Clamp-On Connectors for Air

Low-Pressure Clamp-On Connectors for Water

Medium-Pressure Clamp-On Connectors