Iron Couplings | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	For Shaft Diameter For Shaft Diameter

	Type Type


Connector	Adapter

Pipe	Reducer

Reducing Adapter	Union

Bushing	Repair Clamp

Plug	Cap

Clamp

	For Shaft Type For Shaft Type

	Round
	Keyed
	Spline

	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

	Thread Type Thread Type

	Material Material	Show

Iron

	Material Material	Hide

	Shape Shape


Straight	Tee

90° Elbow	Cap/Plug

45° Elbow	Wye

Cross

	Length Length

	OD OD

	Construction Construction

Multipiece

Seamless

Two Piece

	For Motion Type For Motion Type

Forward/Reverse

Start/Stop

Continuous

	For Pipe Schedule For Pipe Schedule


40	80

160

	For Use With For Use With

	Connection Style Connection Style

	Shaft Mount Type Shaft Mount Type


Clamp On	Set Screw

	For Shaft Misalignment Type For Shaft Misalignment Type


Angular	Parallel

Axial	None

	For Pipe Material For Pipe Material

	Finish Finish

	Gender Gender

Female

Male

	Set Screw Material Set Screw Material

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

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1,101 Products

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.

Low-Pressure Iron Threaded Pipe Fittings
with Right-Hand and Left-Hand Threads

The threads on these fittings have clockwise (right-hand) threads on one end and counterclockwise (left-hand) threads on the other end.

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Fittings

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.

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

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 Iron
and Steel Threaded Pipe Fittings

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

Thick-Wall Galvanized Iron and Steel
Threaded Pipe Nipples and Pipe

Typically used with medium-pressure galvanized iron and steel threaded pipe fittings. Also known as Schedule 80.

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.

Grooved-End Iron Pipe Fittings

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

Drain, Waste, and Vent Iron Pipe Fittings

Also known as no-hub pipe fittings and soil pipe fittings, these fittings are for use in gravity-flow applications both above and below ground.

Drain, Waste, and Vent Iron Pipe

Use this pipe in gravity-flow applications both above and below ground.

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.

Clamps for Easy-Access CPVC Pipe Fittings for Chemicals

Clamps for Easy-Access CPVC
Pipe Fittings for Chemicals

Use these clamps to connect easy-access CPVC pipe fittings and pipe.

Medium-Pressure Clamp-On Connectors

Use in medium-pressure applications up to 230 psi.

Medium-Pressure Pipe Repair Clamps

Use in medium-pressure applications up to 600 psi.

Hose Fittings

Twist-Claw Hose Couplings for Air and Water

Couplings have an identical claw-style head that connects to another twist-claw hose coupling with a quarter twist.

Spring-Lock Twist-Claw Hose
Couplings for Air and Water

Couplings have a spring-loaded locking sleeve that automatically locks into place to prevent accidental disconnection. The identical claw-style head connects to another spring-lock twist-claw hose coupling with a quarter twist.

Extra-Large Twist-Claw Hose
Couplings for Air and Water

Couplings are only compatible with other extra-large twist-claw hose couplings. Use with tools and equipment up to 2 pipe size.

Large Twist-Claw Hose Couplings for Air and Water

Also known as universal couplings, these have identical claw-style heads and connect by being pushed together with a quarter twist.

Interlocking-Clamp Hose Fittings for Steam

Also known as ground-joint couplings and boss couplings, these fittings are designed for high-pressure steam applications up to 600 psi. Insert the barbed end of the fitting into hose, then position the interlocking clamp over the hose and bolt into place. The clamp firmly grips your hose as it locks into the ring of the barbed end, creating a leak-tight seal.

Shaft Connectors

Set Screw Flexible Shaft Couplings

Each hub includes a set screw (unless noted), which bites into your shaft to hold the coupling in place.

Machinable-Bore Flexible Shaft Couplings

Customize the bore of these flexible couplings to align uncommon shaft sizes as well as shafts that have become undersized from wear or oversized from coatings.

High-Speed Vibration-Damping Flexible Shaft Couplings

Use these gear-shaped couplings for high-speed and high-torque applications.

Vibration-Damping Flexible Shaft Couplings

A flexible tire on these couplings safeguards components on your shafts by reducing vibration and shock.

Splined Flexible Shaft Couplings

For use with splined shafts, which are commonly found in gearboxes and pumps, these couplings are capable of transmitting more torque than couplings for round and keyed shafts.

Splined-to-Keyed Flexible Shaft Couplings

Connect splined shafts to keyed shafts. These couplings are commonly used to connect hydraulic pumps, compressors, and other heavy duty equipment, which often have splined shafts, to electric motors and other components that often have keyed shafts.

Two-Piece Shaft Coupling Bridges

When your shafts are not close enough to use standard couplings, these have the length to bridge the gap.

High-Torque Easy-Install Single U-Joints

These U-joints handle at least 11,000 in.-lbs. of torque.

Conduit and Fittings

Connectors for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit

Join pieces of conduit.

Conduit Adapters

Transition between types of conduit.

Galvanized Iron and Steel Slip-On Framing and Fittings

To provide corrosion resistance in wet environments, this framing is galvanized.

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Iron Threaded Pipe Fittingswith Right-Hand and Left-Hand Threads

FM-Approved Low-PressureCast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

High-Pressure Iron and Steel Threaded Pipe Fittings

Medium-Pressure Iron and Steel Threaded Pipe Fittings

Medium-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Thick-Wall Galvanized Iron and SteelThreaded Pipe Nipples and Pipe

Medium-Pressure Pipe Fittingsfor Joining Dissimilar Metals

Grooved-End Iron Pipe Fittings

Drain, Waste, and Vent Iron Pipe Fittings

Drain, Waste, and Vent Iron Pipe

Iron and Steel Pipe Fittings with Flanged Ends

Clamps for Easy-Access CPVC Pipe Fittings for Chemicals

Clamps for Easy-Access CPVCPipe Fittings for Chemicals

Medium-Pressure Clamp-On Connectors

Medium-Pressure Clamp-On Connectors

Medium-Pressure Pipe Repair Clamps

Medium-Pressure Pipe Repair Clamps

Hose Fittings

Twist-Claw Hose Couplings for Air and Water

Spring-Lock Twist-Claw HoseCouplings for Air and Water

Extra-Large Twist-Claw HoseCouplings for Air and Water

Large Twist-Claw Hose Couplings for Air and Water

Interlocking-Clamp Hose Fittings for Steam

Shaft Connectors

Set Screw Flexible Shaft Couplings

Machinable-Bore Flexible Shaft Couplings

High-Speed Vibration-Damping Flexible Shaft Couplings

Vibration-Damping Flexible Shaft Couplings

Splined Flexible Shaft Couplings

Splined-to-Keyed Flexible Shaft Couplings

Two-Piece Shaft Coupling Bridges

High-Torque Easy-Install Single U-Joints

Conduit and Fittings

Connectors for Medium-Wall (IMC)and Thick-Wall (Rigid) Steel Conduit

Conduit Adapters

Galvanized Iron and Steel Slip-On Framing and Fittings

Galvanized Iron and Steel Slip-On Framing and Fittings

Low-Pressure Iron Threaded Pipe Fittings
with Right-Hand and Left-Hand Threads

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Fittings

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Thick-Wall Galvanized Iron and Steel
Threaded Pipe Nipples and Pipe

Medium-Pressure Pipe Fittings
for Joining Dissimilar Metals

Clamps for Easy-Access CPVC
Pipe Fittings for Chemicals

Spring-Lock Twist-Claw Hose
Couplings for Air and Water

Extra-Large Twist-Claw Hose
Couplings for Air and Water

Connectors for Medium-Wall (IMC)
and Thick-Wall (Rigid) Steel Conduit