Orifice Unions | McMaster-Carr

	For Use With For Use With

	Body Material Body Material

	Pipe Size Pipe Size

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

	Thread Type Thread Type

NPT

UNF

UNC

	Connection Style Connection Style


Threaded	Compression

Flanged	Barbed

Push to Connect

	Connection Type Connection Type


Pipe	Tube

Press In

	Maximum Pressure Maximum Pressure

	Gender Gender

Female

Male

	Orifice Diameter Orifice Diameter

	Length Length

	Orifice Type Orifice Type

	Valve Type Valve Type

Orifice

Iris

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

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

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Water Flow Water Flow

	Hex Width Hex Width

	Air Flow Air Flow

	Outlet Water Flow Outlet Water Flow

	Thread Size Thread Size

	For Tube OD For Tube OD

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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112 Products

How to 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.

Threaded Flow Control Orifices

Connect these orifices to threaded pipe, or insert them into threaded holes.

Compression Flow-Control Orifices

Compression fittings bite down on the outside of hard metal tubing for a secure connection.

Press-In Flow-Control Orifices

Press these orifices into machined holes in connectors, manifolds, and other custom parts.

Flange-Mount Flow-Control Orifices

Also known as orifice plates, these mount between orifice flange unions.

Barbed Flow-Control Orifices

Insert the barbed ends of these orifices into rubber and soft plastic tubing, and secure them with a clamp.

Pressure-Compensating
Threaded Flow-Control Orifices

When inlet pressure changes, these orifices automatically adjust to deliver a consistent outlet flow. They connect to threaded pipe, or fit into threaded holes

Push-to-Connect Flow-Control Orifices

Push tubing into these orifices, and an internal ring holds them in place. They're for use with plastic and soft metal tubing.

Flow-Control Orifices for Water

Also known as flow restrictors and precision orifice valves, these orifices are used to throttle, vent, bleed, or regulate flow in water systems.

Flow-Control Orifices for Chemicals

Made of PVC, these orifices have excellent resistance to a wide range of corrosive chemicals.

Flow-Adjustment Valves for Dry Material

Also known as iris valves, these control the flow of powders, grains, and other dry material through bins and hoppers.

Metal Pipe and Pipe Fittings

Low-Pressure Steel Bleed Rings

Access the inside of lines operating up to 285 psi, so you can vent pressure, drain liquid, or take samples. Made of black-coated steel, these bleed rings should be used in dry environments to prevent rusting.

Low-Pressure Stainless Steel Bleed Rings

Create an access point in systems operating up to 230 psi where corrosion is a concern. Made of stainless steel, these bleed rings resist rusting.

High-Pressure Steel Bleed Rings

Tap into your line in systems operating up to 1,400 psi to vent pressure, drain liquid, or take samples. Made of black-coated steel, these bleed rings should be used in dry environments to prevent rusting.

High-Pressure Stainless Steel Bleed Rings

To relieve pressure, siphon liquid, or take samples in lines where corrosion is a concern, these bleed rings act as a port between two pipe flanges in systems operating up to 1,200 psi. They're stainless steel, so they resist rusting.

How to Measure Fittings

Flow-Control Orifices

Threaded Flow Control Orifices

Compression Flow-Control Orifices

Press-In Flow-Control Orifices

Flange-Mount Flow-Control Orifices

Barbed Flow-Control Orifices

Pressure-CompensatingThreaded Flow-Control Orifices

Push-to-Connect Flow-Control Orifices

Flow-Control Orifices for Water

Flow-Control Orifices for Chemicals

Flow-Adjustment Valves for Dry Material

Flow-Adjustment Valves for Dry Material

Metal Pipe and Pipe Fittings

Low-Pressure Steel Bleed Rings

Low-Pressure Stainless Steel Bleed Rings

High-Pressure Steel Bleed Rings

High-Pressure Stainless Steel Bleed Rings

Pressure-Compensating
Threaded Flow-Control Orifices