Nipples for Oxygen | McMaster-Carr

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Material

Shape

For Use With

Acetic Acid (White Vinegar)

Acetic Acid (White Vinegar) (5% Concentration)

Acetic Acid (White Vinegar) (10% Concentration)

Acetic Acid (White Vinegar) (75% Concentration)

Dichlorotetrafluoroethane

Hydraulic Fluid (Petroleum Based)

Hydrochloric Acid

Hydrochloric Acid (10% Concentration)

Hydrochloric Acid (25% Concentration)

Hydrochloric Acid (37% Concentration)

Nitric Acid (10% Concentration)

Phosphoric Acid (70% Concentration)

Phosphoric Acid (85% Concentration)

Salt Water (30% Concentration)

Silane

Silicon Tetrafluoride

Sodium Carbonate (Soda Ash)

Sodium Chloride

Sodium Hydroxide (Caustic Soda)

Sodium Hydroxide (Caustic Soda) (50% Concentration)

Sulfuric Acid (30% Concentration)

Sulfuric Acid (70% Concentration)

Sulfuric Acid (75% Concentration)

Trifluoroethane

Tungsten Hexafluoride

Gender

Connects To

Maximum Pressure @ Temperature

Fitting Connection

Threading

Thread Size

Body Shape

CGA Number

Hex Width

Maximum Steam Pressure @ Temperature

1,500 psi @ 300° F

Tube Material

316-316L Stainless Steel

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Tube OD

85 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.

Precision Extreme-Pressure Brass Threaded Pipe Fittings

Also known as instrumentation fittings, these have the most precise threads and the tightest tolerances of all the brass pipe fittings we offer. Fittings are brass for good corrosion resistance.

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

Straight Connectors, Female

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
1	2,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	000000

Straight Connectors, Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

NPT Male
Pipe Size	Lg.	Max. Pressure	Max. Steam Pressure		Each
1/8	3/4"	5,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	1 1/8"	4,100 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/8	1 1/8"	4,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/2	1 1/2"	3,900 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/4	1 1/2"	3,800 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Straight Connectors with Hex, Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

NPT Male
Pipe Size	Lg.	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
1/8	1 1/16"	5,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/8	2"	5,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/8	2 1/2"	5,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/8	3"	5,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/4	1 7/16"	4,100 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/4	2"	4,100 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/4	2 1/2"	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/4	3"	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/4	4"	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
3/8	1 7/16"	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/8	2"	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/2	1 7/8"	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	2"	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	2 1/2"	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	000000
1/2	3"	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/4	1 27/32"	3,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000

Straight Adapters, Female × Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

NPT Female × NPT Male
Pipe Size	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
3/4	2,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	000000

Straight Adapters, Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

BSPT Male × NPT Male
Pipe Size	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
1/8	5,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	000000
1/4	4,100 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/8	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	3,800 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
3/4	3,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000

Straight Reducers, Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Male
1/8	1/16	5,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	000000
1/4	1/8	4,100 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/8	1/8	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	0000
3/8	1/4	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	1/4	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	3/8	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/4	1/2	3,800 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	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 with filter help keep the line clean by preventing small particles and other impurities from entering your pressure regulator.

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	Features		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 540 (3,000 psi @ 72° F)	1/4	NPT	2 1/16"	Oxygen	__	000000000	0000
CGA 701 (4,700 psi @ 72° F)	1/4	NPT	3"	Oxygen	Filter	000000000	00000
BS 341 No. 3 (4,350 psi @ 72° F)	1/4	NPT	2 1/2"	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	__	000000000	00000
Chrome-Plated Brass—Tighten With Wrench
CGA 540 (3,000 psi @ 72° F)	1/4	NPT	2 1/16"	Oxygen	__	000000000	00000

Nuts

Female Nut

Male Nut

Maximum Pressure: See table
Maximum Temperature: 120° F

Brass
Number	Gender	Thread Size	Pipe Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 540	Female	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	000000000	00000
CGA 701	Female	1.108"-14	__	NGO	Right Hand	4,700 psi @ 72° F	Oxygen	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	00000
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
BS 341 No. 3	Male	__	5/8	BSPT	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	000000000	00000
Chrome-Plated Brass
CGA 540	Female	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	000000000	00000

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	Pipe Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 540	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	000000000	00000
CGA 577	0.965"-14	__	NGO	Right Hand	3,500 psi @ 72° F	Oxygen	000000000	00000
CGA 701	1.108"-14	__	NGO	Right Hand	4,700 psi @ 72° F	Oxygen	000000000	00000
DIN 477 No. 9	__	3/4	BSPT	Right Hand	4,300 psi @ 72° F	Oxygen	000000000	00000
Brass with Plastic Grip
CGA 540	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	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	00000
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
Chrome-Plated Brass
CGA 540	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	000000000	00000

Male

Male Nut

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

Aluminum-Plated Brass
Number	Pipe Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
BS 341 No. 3	5/8	BSPT	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	000000000	000000

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.

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
540	580	0.908"-14	NGO	Right Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon	0000000	000000

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
346	540	0.830"-14	NGO	Right Hand	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Air, Oxygen	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	540	0.960"-14	NGO	Right Hand	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon	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.

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 × 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
020	A	3/8"-24	UN/UNF (CGA)	Right Hand	022	B	9/16"-18	UN/UNF (CGA)	Right Hand	Oxygen	0000000	000000
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	020	A	3/8"-24	UN/UNF (CGA)	Right Hand	Oxygen	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
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	1/4	NPT	Right Hand	Oxygen	0000000	000000

Straight Adapters, 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
032 x 022	B	5/8"-18 x 9/16"-18	UN/UNF (CGA)	Right Hand	Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon	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
020	A	3/8"-24	UN/UNF (CGA)	Right Hand	1/4	NPT	Right Hand	Oxygen	000000000	00000
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	1/8	NPT	Right Hand	Oxygen	000000000	0000
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	1/4	NPT	Right Hand	Oxygen	0000000	0000
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	3/8	NPT	Right Hand	Oxygen	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
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	Oxygen	000000	00000

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

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

Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing

For Use With: Ammonia, Argon, Butane, Carbon Dioxide, Chloride, Fluoride, Fluorocarbon, Germane, Halide, Helium, Hydrogen, Krypton, Laser Gas, Natural Gas, Neon, Nitrogen, Oxygen, Silane, Sulfur Hexafluoride, Tungsten Hexafluoride, Xenon
Temperature Range: -420° to 1000° F
Tubing: Use with 316/316L stainless steel
Compatible With: Swagelok® VCR

Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. Also known as ultra-high-purity fittings, they’re packed in a Class 100 clean room, cleaned, and double bagged. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.

To assemble, place a gasket between the gasket ends before gently rotating the female-threaded fitting onto the male-threaded fitting. Tighten until 1/8 of a turn past finger tight.

Choose threaded fittings to attach directly to other fittings.

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

Straight Adapters, Male Threaded Gasket Fitting × Male Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/2"	1/2	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	0000000	000000

Nuts

Male

Female

Male
For Tube OD	Nut Material	Max. Pressure	Max. Vacuum	Lg.		Each
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	13/16"	0000000	000000
Female
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	7/8"	0000000	00000

Gaskets

Gasket

Gasket with
Retaining
Tabs

Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.

Hard and heat resistant, stainless steel gaskets can be used in a wider range of applications than nickel gaskets such as carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.

Silver-plated stainless steel gaskets are softer than unfinished stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they oxidize when exposed to air, and silver particles might flake off during assembly.

Gaskets with retaining tabs stay in place during installation, so you don’t have to hold the gasket while fastening fittings together. This also means they’re less likely to scratch or nick your fittings by rotating during installation.

Nickel Gasket
For Tube OD	Max. Vacuum	Environmental Rating		Each
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	00000
316L Stainless Steel Gasket
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	0000000	0000
Silver-Plated 316L Stainless Steel Gasket
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000
316L Stainless Steel Gasket with Retaining Tabs
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000