NGO Bungs | McMaster-Carr

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CGA Number

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Thread Size

Connects To

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Gender

For Use With

Thread Direction

Thread Type

UN/UNF (SAE Straight)

Material

Maximum Pressure @ Temperature

Fitting Connection

Shape

Tighten With

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Minimum Temperature

Not Rated

REACH

Not Compliant

RoHS

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Exempt

Not Compliant

Export Control Classification Number (ECCN)

EAR99

Maximum Temperature

Less than 200° F

Finish

Chrome Plated

Gas Fitting Size

Grip Material

Valve Type

63 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.

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. 316 stainless steel nuts have excellent corrosion resistance.

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.

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	79215A648	00000
CGA 280	0.750"-14	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	79215A411	00000
CGA 300	0.830"-14	NGO	Right Hand	500 psi @ 72° F	Ethyl Chloride	79215A651	0000
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A653	0000
CGA 326	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Nitrous Oxide	79215A672	0000
CGA 330	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Boron Trifluoride, Carbonyl Sulfide, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Silicon Tetrafluoride, Sulfur Tetrafluoride	79215A716	00000
CGA 346	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Air	79215A655	0000
CGA 347	0.830"-14	NGO	Right Hand	4,700 psi @ 72° F	Air	79215A724	00000
CGA 350	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	79215A666	0000
CGA 410	0.855"-14	NGO	Left Hand	500 psi @ 72° F	Acetylene	79215A413	0000
CGA 520	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	79215A659	0000
CGA 540	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	79215A662	0000
CGA 555	0.908"-14	NGO	Left Hand	3,000 psi @ 72° F	Butane, LP Gas	79215A772	0000
CGA 577	0.965"-14	NGO	Right Hand	3,500 psi @ 72° F	Oxygen	79215A414	00000
CGA 660	1.035"-14	NGO	Right Hand	3,000 psi @ 72° F	Refrigerant Gases	79215A718	00000
CGA 701	1.108"-14	NGO	Right Hand	4,700 psi @ 72° F	Oxygen	79215A416	00000
Brass with Plastic Grip
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A428	00000
CGA 346	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Air	79215A429	00000
CGA 540	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	79215A432	00000
Chrome-Plated Brass
CGA 320	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A315	00000
CGA 326	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Nitrous Oxide	4183N403	00000
CGA 346	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Air	4183N404	00000
CGA 350	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	79215A317	00000
CGA 540	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	79215A322	00000
316 Stainless Steel
CGA 670	1.035"-14	NGO	Left Hand	3,000 psi @ 72° F	Hydrogen Fluoride, Nitrogen Trifluoride, Tungsten Hexafluoride	79215A515	00000
CGA 677	1.035"-14	NGO	Left Hand	6,400 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A728	00000

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	79215A671	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	79215A657	0000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A664	0000
CGA 590	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	79215A668	0000
CGA 680	1.040"-14	NGO	Right Hand	4,700 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A726	00000
CGA 702	1.120"-14	NGO	Right Hand	6,400 psi @ 72° F	Air	79215A417	00000
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	79215A431	00000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A433	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	79215A319	00000
CGA 580	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A324	00000
CGA 590	0.960"-14	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	79215A325	00000
Chrome-Plated Brass with Plastic Grip
CGA 500	0.880"-14	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	4183N402	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.

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	7923A23	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	7923A12	0000
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	7923A13	00000
346	580	0.830"-14	NGO	Right Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Xenon	7923A19	00000
350	580	0.830"-14	NGO	Left Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Carbon Monoxide, Ethane, Ethylene, Helium, Hydrogen, Krypton, Methane, Methyl Fluoride, Natural Gas, Neon, Nitrogen, Xenon	7923A25	00000
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	7923A42	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	7923A28	00000
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	7923A29	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	7923A46	00000
555	580	0.908"-14	NGO	Left Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Butane, Helium, Krypton, LP Gas, Neon, Nitrogen, Xenon	7923A47	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	7923A22	000000
200	520	0.628"-14	NGO	Right Hand	0.899"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	7923A24	00000
346	540	0.830"-14	NGO	Right Hand	0.908"-14	NGO	Right Hand	3,000 psi @ 72° F	Air, Oxygen	7923A18	00000
520	200	0.899"-14	NGO	Right Hand	0.628"-14	NGO	Right Hand	500 psi @ 72° F	Acetylene	7923A16	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	7923A43	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	7923A11	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	7923A45	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	7923A15	00000
580	320	0.960"-14	NGO	Right Hand	0.830"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon	7923A32	00000
580	346	0.960"-14	NGO	Right Hand	0.825"-14	NGO	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Xenon	7923A21	00000
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	7923A34	00000
590	346	0.960"-14	NGO	Left Hand	0.825"-14	NGO	Right Hand	3,000 psi @ 72° F	Air, Sulfur Hexafluoride	7923A52	00000

Male Tank × Female Regulator

Maximum Pressure: 3,000 psi @ 72° F
Maximum Temperature: 120° F

CGA Number		Tank Connection			Regulator Connection
Tank	Regulator	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	For Use With		Each
Brass
580	590	0.960"-14	NGO	Right Hand	0.965"-14	NGO	Left Hand	Argon, Helium, Krypton, Neon, Nitrogen, Sulfur Hexafluoride, Xenon	7923A53	000000
590	580	0.960"-14	NGO	Left Hand	0.960"-14	NGO	Right Hand	Argon, Helium, Krypton, Neon, Nitrogen, Sulfur Hexafluoride, Xenon	7923A35	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	7976A21	000000