Acetylene Regulators | McMaster-Carr

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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.

About Gas Regulators

For Use With: See Table
Temperature Range: -20° to 120° F

Attach these valves to acetylene, hydrogen, methane, propane, or propylene tanks to reduce a high inlet pressure to a lower, stable outlet pressure. They have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.

Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.

Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.

Valves with a brass body have a longer service life than valves with a brass and steel body.

Valves with a stainless steel diaphragm can withstand harsh environments.

Single-Stage Valves

Male Outlet × Female Inlet Single-Stage Valve With Knob

Male Outlet × Female Inlet Single-Stage Valve With T-Handle

Male Outlet × Male Inlet Single-Stage Valve With Knob

Male Outlet × Male Inlet Single-Stage Valve With T-Handle

Inlet				Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Acetylene
UNF Male Outlet × NGO Female Inlet
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	0000000	0000000
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	000000	000000
UNF Male Outlet × NGO Male Inlet
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	0000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000

Two-Stage Valves

Male Outlet × Female Inlet Two-Stage Valve With T-Handle

Male Outlet × Male Inlet Two-Stage Valve With T-Handle

Inlet				Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Acetylene
UNF Male Outlet × NGO Female Inlet
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	0000000
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	000000	000000
UNF Male Outlet × NGO Male Inlet
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	0000000	000000

Pressure-Regulating Valves for Fuel Gases

With Knob

For Use With: See Table
Temperature Range: See Table

Install these valves directly in gas distribution pipelines for acetylene, hydrogen, or propane. They automatically reduce a high inlet pressure to a lower, stable outlet pressure. Valves have two outlets to fit various pipe configurations and come with a plug to close the unused outlet. The gauge monitors outlet pressure. All valves are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate.

	Inlet			Outlet
For Use With	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Gauge Range, psi	Temperature Range, ° F	End-to-End Lg.	Port-to-Port Lg.		Each
NPT Female
Brass Body—Neoprene/Nylon Diaphragm and Neoprene Seal
Acetylene	1/4	Side	350	1/4	Bottom, Side	0 to 30	-20° to 120°	2.60"	1.32"	0000000	0000000

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. 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.

Nuts with left-hand threads are identified with a notch.

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 200	0.628"-20	NGO	Right Hand	500 psi @ 72° F	Acetylene	000000000	00000
CGA 410	0.855"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene	000000000	0000
CGA 520	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	000000000	0000

Male

Male Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F

Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 500	0.880"-14	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	000000000	000000
CGA 510	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	0000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	0000
CGA 590	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	000000000	0000
Brass with Plastic Grip
CGA 510	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	00000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	00000
Chrome-Plated Brass
CGA 510	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	00000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	00000
CGA 590	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	000000000	00000

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 200 (500 psi @ 72° F)	1/8	NPT	1 1/4"	Acetylene	000000000	00000
CGA 410 (500 psi @ 72° F)	1/4	NPT	2 33/64"	Acetylene	000000000	0000
CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F)	1/4	NPT	2 1/2"	Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon	000000000	0000
CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F)	1/4	NPT	3"	Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon	000000000	0000
CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F)	1/4	NPT	3 1/2"	Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon	000000000	0000
CGA 520 (500 psi @ 72° F)	1/4	NPT	1 3/4"	Acetylene	000000000	0000
Brass—Tighten By Hand
CGA 510 (500 psi @ 72° F); CGA 580, 590 (3,000 psi @ 72° F)	1/4	NPT	3 33/64"	Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon	000000000	00000
Chrome-Plated Brass—Tighten With Wrench
CGA 510 (500 psi @ 72° F); CGA 580, 590 (3,000 psi @ 72° F)	1/4	NPT	3 1/2"	Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon	000000000	00000

Nuts

Female Nut

Male 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 200	Female	0.628"-20	NGO	Right Hand	500 psi @ 72° F	Acetylene	000000000	00000
CGA 410	Female	0.855"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene	000000000	0000
CGA 500	Male	0.880"-14	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	000000000	00000
CGA 510	Male	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	0000
CGA 520	Female	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	000000000	0000
CGA 580	Male	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	0000
CGA 590	Male	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	000000000	0000
Brass with Plastic Grip
CGA 510	Male	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	00000
CGA 580	Male	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	00000
Chrome-Plated Brass
CGA 510	Male	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	000000000	00000
CGA 580	Male	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	00000
CGA 590	Male	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	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
200	510	0.628"-14	NGO	Right Hand	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	000000
300	510	0.830"-14	NGO	Right Hand	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethyl Chloride, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	0000
410	510	0.855"-14	NGO	Left Hand	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000
520	510	0.899"-14	NGO	Right Hand	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000
555	510	0.908"-14	NGO	Left Hand	0.880"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, LP Gas, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000

Female 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
200	300	0.628"-14	NGO	Right Hand	0.830"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene, Ethyl Chloride	0000000	000000
200	520	0.628"-14	NGO	Right Hand	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	0000000	00000
520	200	0.899"-14	NGO	Right Hand	0.628"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	0000000	00000

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
510	200	0.880"-14	NGO	Left Hand	0.628"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	000000
510	300	0.880"-14	NGO	Left Hand	0.830"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethyl Chloride, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000
510	410	0.880"-14	NGO	Left Hand	0.855"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000
510	520	0.880"-14	NGO	Left Hand	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride	0000000	00000

Threaded Hose-to-Propane-Torch Adapters for Compressed Gas

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

These adapters allow you to connect a hose to a propane torch. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance. Fittings have left-hand threads that 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.

CGA Number		Hose Connection			Torch Connection
Hose	Torch	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	For Use With		Each
Brass
023	600	9/16"-18	UN/UNF (CGA)	Left Hand	1"-20	UN/UNF (CGA)	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	000000

Threaded Hose Fittings for Compressed Gas

Use these fittings to connect welding hose to pressure regulators and torches. They are also known as CGA (Compressed Gas Association) fittings. Fittings 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.

Straight Adapters, Female Hose × Female Pipe

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Female Hose Connection					Female Pipe Connection
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Thread Direction	For Use With		Each
Brass
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	1/4	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000	000000

Straight Adapters, Female Hose × Male Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Female Hose Connection					Male Hose Connection
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
Brass
021	A	3/8"-24	UN/UNF (CGA)	Left Hand	023	B	9/16"-18	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	000000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	021	A	3/8"-24	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	00000

Straight Adapters, Female Hose × Male Pipe

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Female Hose Connection					Male Pipe Connection
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Thread Direction	For Use With		Each
Brass
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	1/4	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	000000

Straight Adapters, Female Pipe × Male Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Female Pipe Connection			Male Hose Connection
Pipe Size	Thread Type	Thread Direction	CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
Brass
1/4	NPT	Right Hand	023	B	9/16"-18	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	000000

Straight Adapters, Male Hose × Male Pipe

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Male Hose Connection					Male Pipe Connection
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Thread Direction	For Use With		Each
Brass
021	A	3/8"-24	UN/UNF (CGA)	Left Hand	1/4	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	00000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	1/8	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	0000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	1/4	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	0000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	3/8	NPT	Right Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	0000

Straight Connectors, Male Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Brass
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
021	A	3/8"-24	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000	00000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000	0000

Caps, Female Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Brass
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	Chain Lg.	For Use With		Each
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	6"	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	00000

Threaded Hose-to-Propane-Tank Adapters for Compressed Gas

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

These adapters have a male threaded end that connects to a propane tank and a male threaded end that connects to a hose. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance. Fittings have left-hand threads that 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.

CGA Number		Hose Connection			Tank Connection
Hose	Tank	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	For Use With		Each
Brass
023	510	9/16"-18	UN/UNF (CGA)	Left Hand	0.880"-14	NGO	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	0000000	000000

Barbed Hose Fittings for Compressed Gas

Commonly used in low-pressure welding applications, these fittings connect downstream of your tank and pressure regulator. Slide the barbed end into rubber hose and secure with a crimp-on hose ferrule. Fittings are brass for good corrosion resistance.

Adapters let you adapt to a threaded end so you can connect welding hose to torches or pressure regulators. They consist of a barbed shaft with a rounded end that sits inside a threaded CGA nut (sold separately) so you can make a threaded hose connection. Adapters with a spiral barbed end twist into hose for an easier installation than adapters with a standard barb.

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

Straight Adapters, Barbed Hose × Threaded Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Attachment Type: Use Crimp-On Hose Ferrules

Adapters						Nuts with Right-Hand Threads			Nuts with Left-Hand Threads
For Hose ID	For CGA Number	Gas Fitting Size	For Use With		Each	CGA Number		Each	CGA Number		Each
Brass
3/16"	020, 021	A	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	00000	020	0000000	00000	021	000000000	00000
3/16"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	000	022	000000	000	023	000000	000
1/4"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	000	022	000000	000	023	000000	000
5/16"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000	022	000000	000	023	000000	000
3/8"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000	022	000000	000	023	000000	000

Straight Adapters, Spiral Barbed Hose × Threaded Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Attachment Type: Use Crimp-On Hose Ferrules

Adapters						Nuts with Right-Hand Threads			Nuts with Left-Hand Threads
For Hose ID	For CGA Number	Gas Fitting Size	For Use With		Each	CGA Number		Each	CGA Number		Each
Brass
3/16"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	0000000	00000	022	000000	00000	023	000000	00000
1/4"	022, 023	B	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	0000000	0000	022	000000	000	023	000000	000

Nuts for Barbed Hose Fittings for Compressed Gas

Also known as CGA (Compressed Gas Association) nuts, these are designed for low-pressure welding applications downstream of your tank and pressure regulator. Slide a barbed hose adapter for compressed gas into a male or female nut to make a threaded connection to torches or pressure regulators.

Nuts with left-hand threads are identified with a notch.

Brass nuts have good corrosion resistance. Note: Nuts have a CGA number that corresponds to a specific type of gas. Choose a nut 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

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Brass
CGA Number	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
020	A	3/8"-24	UN/UNF (CGA)	Right Hand	Oxygen	0000000	00000
021	A	3/8"-24	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	000
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	Oxygen	000000	000
023	B	9/16"-18	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000	000
025	C	7/8"-14	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	0000
027	D	1 1/4"-12	UN/UNF (CGA)	Left Hand	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane	000000000	00000

Hose Crimping Tool and Fitting Sets for Compressed Gas

Sets contain a crimping tool and a variety of fittings, nuts, and ferrules so you can connect pressure regulators, torches, and other components of your welding system. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance.

Barbed adapters let you adapt to a threaded end so you can connect welding hose to pressure regulators or torches. They consist of a barbed shaft with a rounded end that sits inside a threaded nut so you can make a threaded hose connection.

Barbed connectors are also known as hose menders and splicers. Use them to connect lengths of hose or to repair damaged hose. Slide the barbed end into welding hose and use a hose ferrule and the crimping tool to secure the fitting to hose.

Threaded connectors let you attach threaded welding hose to pressure regulators and torches.

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.

Brass
For Hose ID	No. of Pieces	Includes	Max. Pressure	For Use With		Each
3/16", 1/4"	93	Crimping Tool Eight barbed hose adapters for 3/16" hose ID (use with A-size nuts) Six barbed hose adapters for 3/16" hose ID (use with B-size nuts) Ten barbed hose adapters for 1/4" hose ID (use with B-size nuts) Two barbed hose connectors for 3/16" hose ID Four barbed hose connectors for 1/4" hose ID One A-size 3/8"-24 male right-hand threaded connector (CGA-020) One A-size 3/8"-24 male left-hand threaded connector (CGA-021) One B-size 9/16"-18 male right-hand threaded connector (CGA-022) One B-size 9/16"-18 male left-hand threaded connector (CGA-023) Four A-size 3/8"-24 right-hand threaded nuts (CGA-020) Four A-size 3/8"-24 left-hand threaded nuts (CGA-021) Eight B-size 9/16"-18 female right-hand threaded nuts (CGA-022) Eight B-size 9/16"-18 female left-hand threaded nuts (CGA-023) Twelve ferrules with 0.45" hose end ID Ten ferrules with 0.562" hose end ID Twelve ferrules with 0.593" hose end ID	200 psi @ 72° F	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	0000000	0000000
5/16", 3/8"	71	Crimping Tool Eight barbed hose adapters for 5/16" hose ID (use with B-size nuts) Eight barbed hose adapters for 3/8" hose ID (use with B-size nuts) Two barbed hose connectors for 5/16" hose ID Two barbed hose connectors for 3/8" hose ID One B-size 9/16"-18 male right-hand threaded connector (CGA-022) One B-size 9/16"-18 male left-hand threaded connector (CGA-023) Eight B-size 9/16"-18 female right-hand threaded nuts (CGA-022) Eight B-size 9/16"-18 female left-hand threaded nuts (CGA-023) Eight ferrules with 0.625" hose end ID Eight ferrules with 0.656" hose end ID Six ferrules with 0.687" hose end ID Eight ferrules with 0.718" hose end ID	200 psi @ 72° F	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	0000000	000000

Quick-Disconnect Hose Couplings for Compressed Gas

Use these couplings to quickly link and unlink welding hoses, torches, and pressure regulators. They consist of a plug and socket that are sold together as a set of two—you’ll get one right-hand connection for oxygen and one left-hand connection for fuel gas. The connections are noninterchangeable and color coded so you can’t mix lines. The male threaded ends attach to threaded welding hose, and the female threaded ends attach to a torch or pressure regulator. To connect couplings, push the plug into the socket; the sleeve on the socket has a spring-loaded lock for gas-tight connections. To disconnect, pull back on the socket sleeve and twist to release the plug. The sockets have a shut-off valve that stops the flow when the coupling is separated so gas won’t leak from the line. The sockets also have a built-in check valve to prevent gas backflow. Couplings are also known as CGA (Compressed Gas Association) couplings. They are brass for good corrosion resistance.

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

Note: Couplings have a CGA number that corresponds to a specific type of gas. Make sure the CGA number of the coupling matches the CGA number of your tank and other system components.

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

Brass Plug and Socket Sets, Male Hose × Female Torch

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Female Torch Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Torch Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000000

Brass Plug and Socket Sets, Male Hose × Female Regulator

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Female Regulator Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Regulator Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000000

Brass Plug and Socket Sets, Male Hose × Male Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Male Hose Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Male Hose Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000000

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator. Check valves do not stop flashbacks.

Max. Pressure, psi			Male Hose Connection			Male Pipe Connection
Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Material		Each
50	50	50	Right Hand	9/16"-18	UNF	Left Hand	1/4	NPT	Brass	000000	000000

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch. Check valves do not stop flashbacks.

Max. Pressure, psi			Male Hose Connection			Female Hose Connection
Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Material		Each
50	50	50	Left Hand	3/8"-24	UNF	Left Hand	3/8"-24	UNF	Brass	000000	000000
50	50	50	Left Hand	9/16"-18	UNF	Left Hand	9/16"-18	UNF	Brass	000000	00000

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How to Identify and Measure Fittings

About Gas Regulators

Tank-Mount Pressure-Regulating Valves for Fuel Gases

Pressure-Regulating Valves for Fuel Gases

Nuts for High-Pressure Nipples for Compressed Gas

High-Pressure Nipples for Compressed Gas

High-Pressure Threaded Fittings for Compressed Gas

Threaded Hose-to-Propane-Torch Adapters for Compressed Gas

Threaded Hose Fittings for Compressed Gas

Threaded Hose-to-Propane-Tank Adapters for Compressed Gas

Barbed Hose Fittings for Compressed Gas

Nuts for Barbed Hose Fittings for Compressed Gas

Hose Crimping Tool and Fitting Sets for Compressed Gas

Quick-Disconnect Hose Couplings for Compressed Gas

Welding Gas Check Valves for Regulators

Welding Gas Check Valves for Torches