6 Pipe Size Couplings | McMaster-Carr

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	Pipe Size Pipe Size	Show

	Pipe Size Pipe Size	Hide

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


Connector	Adapter

Reducer	Pipe

Reducing Adapter	Bushing

Union	Expansion Joint

Cap	Flange

Stub End

	Material Material

	Shape Shape


Straight	Tee

90° Elbow	Cap/Plug

45° Elbow	Wye

Cross	22 1/2° Elbow

11 1/4° Elbow	Double Wye

	Connection Style Connection Style

	Schedule Schedule


10	40

80

	For Pipe Schedule For Pipe Schedule


10	40

80

	System of Measurement System of Measurement

Inch

	Length Length

	For Use With For Use With

	For Pipe Material For Pipe Material

	Gender Gender

Female

Male

	Threading Threading

Fully Threaded

Threaded on Both Ends

Threaded on One End

Unthreaded

	Thread Type Thread Type

	Connection Type Connection Type


Pipe	Hose

Tube

	Color Color

	White		Dark Gray
	Light Gray		Clear
	Blue		Orange

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

DFARS Specialty Metals
COTS-Exempt

	Specifications Met Specifications Met

	Maximum Pressure Maximum Pressure

	Socket Connect Type Socket Connect Type


Weld	Cement

	Maximum Temperature Maximum Temperature

100° to 249° F

250° to 499° F

500° to 999° F

	OD OD

	ID ID

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489 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.

Standard-Wall Stainless Steel
Threaded Pipe Nipples and Pipe

Typically used with low-pressure stainless steel threaded pipe fittings.

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

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

Standard-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall and low-pressure stainless steel unthreaded pipe fittings.

Thick-Wall Stainless Steel Unthreaded Pipe

Typically used with thick-wall and high-pressure stainless steel unthreaded pipe fittings.

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Also known as Schedule 10 fittings, these are thin, lightweight, and corrosion resistant.

Thin-Wall Stainless Steel Unthreaded Pipe

Typically used with thin-wall stainless steel unthreaded pipe fittings.

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Standard-Wall Steel Threaded Pipe Nipples and Pipe

Also known as Schedule 40, this steel pipe is designed for low-pressure applications.

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.

Standard-Wall Galvanized Steel
Threaded Pipe Nipples and Pipe

Made of galvanized steel, this Schedule 40 pipe has fair corrosion resistance and is designed for low-pressure applications.

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

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

Standard-Wall Steel Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall and low-pressure iron and steel unthreaded pipe fittings. Also known as Schedule 40.

Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings

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

Grooved-End Iron Pipe Fittings

The grooved ends on these iron fittings connect to pipe with a clamp to easily install piping systems.

Aluminum 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.

Standard-Wall Aluminum
Threaded Pipe Nipples and Pipe

Typically used with low-pressure aluminum threaded pipe fittings.

Standard-Wall Aluminum
Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall aluminum unthreaded pipe fittings.

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.

Thick-Wall Plastic Pipe for Water

Connect to thick-wall plastic pipe fittings for use in heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. Pipe can handle pressures up to 900 psi.

Thick-Wall Plastic Pipe Flanges for Water

Bolt two same-size flanges together with a gasket to create an access point within a line. They are also known as Class 150 flanges. They have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation.

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.

Standard-Wall Plastic Pipe for Water

Connect this pipe to standard-wall plastic pipe fittings in low- to medium-pressure applications up to 810 psi. It is typically used in residential and commercial plumbing and water supply applications.

CPVC Pipe Fittings for Hot Water

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

CPVC Pipe for Hot Water

Connect to CPVC pipe fittings for use in high-temperature plumbing and water supply applications up to 170° or 200° F.

Expansion Joints

Clamp-On Expansion Joints

Slip these joints over your pipe ends and tighten the band clamps for a secure hold.

Expansion Joints with Flanged Ends for High Vibration

These expansion joints have a double-bulb design for extra movement and vibration absorption.

Expansion Joints with Sealing
Flanged Ends for Metal Pipe

Expansion Joints with Sealing
Flanged Ends for Plastic Pipe

Expansion Joints with Flanged Ends

The flanged ends on these expansion joints rotate for easy bolt hole alignment during installation.

High-Temperature All-Metal
Expansion Joints with Flanged Ends

These all-metal expansion joints can handle high temperatures up to 800° F.

Sanitary Expansion Joints with Flanged Ends

Designed for piping systems in breweries, food plants, and other sanitary environments, these flexible joints reduce stress, vibration, and noise by absorbing movement.

Chemical-Resistant Expansion Joints with Flanged Ends

The PTFE body on these expansion joints has a super-smooth surface that stands up to corrosive chemicals.

Expansion Joints with Butt-Weld Ends

These joints weld to unthreaded pipe or another butt-weld fitting for a leak-resistant permanent connection.

Hose Fittings

Metal Cam-and-Groove Hose Couplings for Water

Metal cam-and-groove couplings have better durability than plastic cam-and-groove couplings.

Metal Barbed Hose Fittings for Air and Water

Metal hose fittings have better durability than plastic barbed hose fittings.

Easy-Fit Barbed Hose Fittings for Air and Water

Low-profile barbs and a longer first barb allow for a smoother, easier installation than other barbed fittings. Slide the barbed end into hose and secure with a clamp.

Metal Cam-and-Groove Hose
Couplings for Chemicals and Petroleum

Couplings are metal, which has better durability than plastic cam-and-groove hose couplings. They consist of a plug and a socket that connect and disconnect quickly. Use them if you need frequent access to a line. To connect, insert the plug into the socket and push the levers down.

Easy-Fit Barbed Hose Fittings for Chemicals

Low-profile barbs and a longer first barb allow for a smoother, easier installation than other barbed fittings. Slide the barbed end into hose and secure with a clamp.

Tube Fittings for Metal Tubing

High-Polish Metal Quick-Clamp Sanitary Tube Fittings

The smooth finish inside these stainless steel quick-clamp fittings makes it easy to remove product residue.

Vacuum Fittings for Steel Tubing

Use these fittings in an air vacuum system to avoid the hassle of brazing and welding. Insert two fittings into a clamp and tighten to form a secure seal in steel tubing.

How to Identify and Measure Fittings

Stainless Steel Pipe and Pipe Fittings

Standard-Wall Stainless SteelThreaded Pipe Nipples and Pipe

Standard-Wall Butt-Weld StainlessSteel Unthreaded Pipe Fittings

Standard-Wall Stainless SteelUnthreaded Pipe Nipples and Pipe

Thick-Wall Stainless Steel Unthreaded Pipe

Thin-Wall Butt-Weld StainlessSteel Unthreaded Pipe Fittings

Thin-Wall Stainless Steel Unthreaded Pipe

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Standard-Wall Steel Threaded Pipe Nipples and Pipe

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Standard-Wall Galvanized SteelThreaded Pipe Nipples and Pipe

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Standard-Wall Steel Unthreaded Pipe Nipples and Pipe

Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Grooved-End Iron Pipe Fittings

Aluminum Pipe and Pipe Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

Standard-Wall AluminumThreaded Pipe Nipples and Pipe

Standard-Wall AluminumUnthreaded Pipe Nipples and Pipe

Plastic Pipe and Pipe Fittings for Water

Thick-Wall Plastic Pipe Fittings for Water

Thick-Wall Plastic Pipe for Water

Thick-Wall Plastic Pipe Flanges for Water

Standard-Wall Plastic Pipe Fittings for Water

Standard-Wall Plastic Pipe for Water

CPVC Pipe Fittings for Hot Water

CPVC Pipe for Hot Water

Expansion Joints

Clamp-On Expansion Joints

Expansion Joints with Flanged Ends for High Vibration

Expansion Joints with SealingFlanged Ends for Metal Pipe

Expansion Joints with SealingFlanged Ends for Plastic Pipe

Expansion Joints with Flanged Ends

High-Temperature All-MetalExpansion Joints with Flanged Ends

Sanitary Expansion Joints with Flanged Ends

Chemical-Resistant Expansion Joints with Flanged Ends

Expansion Joints with Butt-Weld Ends

Hose Fittings

Metal Cam-and-Groove Hose Couplings for Water

Metal Barbed Hose Fittings for Air and Water

Easy-Fit Barbed Hose Fittings for Air and Water

Metal Cam-and-Groove HoseCouplings for Chemicals and Petroleum

Easy-Fit Barbed Hose Fittings for Chemicals

Tube Fittings for Metal Tubing

High-Polish Metal Quick-Clamp Sanitary Tube Fittings

Vacuum Fittings for Steel Tubing

Standard-Wall Stainless Steel
Threaded Pipe Nipples and Pipe

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Standard-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Standard-Wall Galvanized Steel
Threaded Pipe Nipples and Pipe

Standard-Wall Aluminum
Threaded Pipe Nipples and Pipe

Standard-Wall Aluminum
Unthreaded Pipe Nipples and Pipe

Expansion Joints with Sealing
Flanged Ends for Metal Pipe

Expansion Joints with Sealing
Flanged Ends for Plastic Pipe

High-Temperature All-Metal
Expansion Joints with Flanged Ends

Metal Cam-and-Groove Hose
Couplings for Chemicals and Petroleum