Iron Pipe Couplings | McMaster-Carr

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	Material Material

Brass

Iron

Plastic

Stainless
Steel

Steel

	For Pipe Material For Pipe Material

	Type Type


Connector	Adapter

Pipe	Reducer

Union	Reducing Adapter

Bushing	Plug

Cap	Clamp

	Pipe Size Pipe Size

1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8

	Thread Type Thread Type

	Shape Shape


Straight	Cap/Plug

90° Elbow	Tee

Cross	45° Elbow

Wye

	Connection Style Connection Style

	For Use With For Use With

	For Pipe Schedule For Pipe Schedule


40	80

160

	Class Class

125

150

300

	System of Measurement System of Measurement

Inch

	Length Length

	Finish Finish

	Gender Gender

Female

Male

	Connection Type Connection Type


Pipe	Tube

Hose

	Threading Threading

Threaded on Both Ends

Fully Threaded

Threaded on One End

Unthreaded

	Maximum Pressure Maximum Pressure

	For Pipe Size For Pipe Size

3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
4 1/2
5
6
8
10
12
14
15
16
18
20
24
28

	Specifications Met Specifications Met

	Schedule Schedule


40	80

	Straight Connector Threading Straight Connector Threading

Threaded on Both Ends

Fully Threaded from One End

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

DFARS Specialty Metals
COTS-Exempt

	Maximum Steam Pressure Maximum Steam Pressure

	Clamp Material Clamp Material

Stainless Steel

Iron

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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 and Pipe Fittings

Use in low-pressure applications up to 285 psi.

High-Pressure Iron and Steel
Threaded Pipe and Pipe Fittings

Use in high-pressure applications up to 6,000 psi.

Medium-Pressure Iron and Steel
Threaded Pipe and Pipe Fittings

Use in medium-pressure applications up to 1,400 psi.

Iron and Steel Unthreaded Pipe and Pipe Fittings

Pipe and fittings weld together for a permanent connection that is stronger and less likely to leak than threaded and clamp-on connections.

Iron and Steel Clamp-On Pipe and Pipe Fittings

Pipe and fittings connect with a clamp, so they can be taken apart as needed for maintenance and repair.

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

Plastic pipe and pipe fittings are lighter in weight than metal pipe and pipe fittings. They are typically for low- to medium-pressure applications up to 1,000 psi.

Clamp-On Connectors

Use these to connect plastic or metal pipe of the same or different materials. Tighten the bands to form a strong seal.

Hose Fittings

Connect these fittings to lengths of hose. Hose fittings are typically used in high-flow, suction, and hydraulic applications.

How to Identify and Measure Fittings

Pipe and Pipe Fittings

Low-Pressure Iron and SteelThreaded Pipe and Pipe Fittings

High-Pressure Iron and SteelThreaded Pipe and Pipe Fittings

Medium-Pressure Iron and SteelThreaded Pipe and Pipe Fittings

Iron and Steel Unthreaded Pipe and Pipe Fittings

Iron and Steel Clamp-On Pipe and Pipe Fittings

Iron and Steel Pipe Fittings with Flanged Ends

Plastic Pipe and Pipe Fittings

Clamp-On Connectors

Hose Fittings

Hose Fittings

Low-Pressure Iron and Steel
Threaded Pipe and Pipe Fittings

High-Pressure Iron and Steel
Threaded Pipe and Pipe Fittings

Medium-Pressure Iron and Steel
Threaded Pipe and Pipe Fittings