Nipples for Carbon Dioxide

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	For Use With For Use With	Show

Carbon Dioxide

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Warning: Products have one, but not necessarily all, of the selected characteristics.

Dichlorotetrafluoroethane

Silicon Tetrafluoride

Tungsten Hexafluoride

	Type Type


Adapter	Nut

	Connects To Connects To

Tank

Regulator

	Gender Gender


Male	Female

	CGA Number CGA Number

	Thread Type Thread Type

	Pipe Size Pipe Size

1/8

1/4

	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Material Material

Brass

	Maximum Pressure Maximum Pressure

3,000 psi @ 72° F

4,350 psi @ 72° F

	Thread Direction Thread Direction

Right Hand

Left Hand

	Tighten With Tighten With

Wrench

Hand

	Length Length

	Shape Shape

	Straight

	Connection Style Connection Style

Threaded

	Connection Type Connection Type

	Pipe

	Minimum Temperature Minimum Temperature

Not Rated

	Maximum Temperature Maximum Temperature

Less than 200° F

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

DFARS Specialty Metals
COTS-Exempt

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

REACH Compliant

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

RoHS Compliant with
Exemptions

	Finish Finish

Chrome Plated

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14 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.

High-Pressure Nipples for Compressed Gas

Commonly used in high-pressure welding applications, these nipples connect your tank to the inlet of a pressure regulator. One side has a threaded pipe end and the other side has a rounded end that sits inside a threaded nut (sold separately) so you can make a threaded connection.

Brass nipples have good corrosion resistance and are softer than 316 stainless steel nipples, so they're easier to thread together. Chrome-plated brass nipples have better corrosion and wear resistance than unplated brass nipples and have a bright, shiny appearance.

Nipples that tighten by hand should be paired with a nut with a plastic grip.

For technical drawings and 3-D models, click on a part number.

Nipples, Tank × Male Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

	Regulator Connection
For Number (Max. Pressure)	Pipe Size	Thread Type	Lg.	For Use With		Each
Brass—Tighten With Wrench
CGA 170 (3,000 psi @ 72° F)	1/8	NPT	1 1/4"	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	000000
CGA 180 (3,000 psi @ 72° F)	1/8	NPT	2"	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	00000
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Dioxide	000000000	0000
DIN 477 No. 6 (4,350 psi @ 72° F)	1/4	NPT	3 1/2"	Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon	000000000	00000
Brass—Tighten By Hand
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 33/64"	Carbon Dioxide	000000000	00000
Chrome-Plated Brass—Tighten With Wrench
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Dioxide	000000000	00000

Nuts

Female Nut

Maximum Pressure: See table
Maximum Temperature: 120° F

Brass
Number	Gender	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 320	Female	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000
Brass with Plastic Grip
CGA 320	Female	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000
Aluminum-Plated Brass
CGA 170	Female	9/16"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	0000
CGA 180	Female	5/8"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	00000
DIN 477 No. 6	Female	W 21.8	Metric	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon	000000000	00000
Chrome-Plated Brass
CGA 320	Female	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000

High-Pressure Threaded Fittings for Compressed Gas

Designed to handle high-pressure welding applications, these fittings are commonly used to connect pressure regulators to compressed gas tanks or cylinders. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance.

Fittings with left-hand threads are identified with a notch in the nut.

Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.

For technical drawings and 3-D models, click on a part number.

Female Tank × Female Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

CGA Number		Tank Connection			Regulator Connection
Tank	Regulator	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
Brass
320	580	0.830"-14	NGO	Right Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon	0000000	000000

Male Tank × Male Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

CGA Number		Tank Connection			Regulator Connection
Tank	Regulator	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
Brass
580	320	0.960"-14	NGO	Right Hand	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon	0000000	000000

Nuts for High-Pressure Nipples for Compressed Gas

Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.

Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Aluminum-plated brass nuts have better corrosion and wear resistance than unplated brass. Chrome-plated brass nuts have comparable corrosion and wear resistance to aluminum-plated brass nuts, and have a bright, shiny appearance.

Nuts with a plastic grip can be tightened by hand instead of with a wrench.

Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.

For technical drawings and 3-D models, click on a part number.

Female

Female Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F

Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000
Brass with Plastic Grip
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000
Aluminum-Plated Brass
CGA 170	9/16"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	0000
CGA 180	5/8"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	000000000	00000
DIN 477 No. 6	W 21.8	Metric	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon	000000000	00000
Chrome-Plated Brass
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	000000000	00000