Regulator Nipples | McMaster-Carr

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105 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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 is designed to sit 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. 316 stainless steel nipples have excellent corrosion resistance.

Nipples with filter help keep the line clean by preventing small particles and other impurities from entering your pressure regulator.

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

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	__	79215A312	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	__	79215A314	00000
CGA 200 (500 psi @ 72° F)	1/8	NPT	1 1/4"	Acetylene	__	79215A649	0000
CGA 280 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Medical Gas Mixtures	__	79215A419	0000
CGA 296 (3,000 psi @ 72° F)	1/4	NPT	3"	Oxygen Mixtures	__	79215A421	0000
CGA 300 (500 psi @ 72° F)	1/4	NPT	1 15/16"	Ethyl Chloride	__	79215A652	0000
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Dioxide	__	79215A654	0000
CGA 326 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Nitrous Oxide	__	79215A673	0000
CGA 346 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Air	__	79215A656	0000
CGA 347 (4,700 psi @ 72° F)	1/4	NPT	3"	Air	__	79215A725	00000
CGA 350 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	__	79215A667	0000
CGA 410 (500 psi @ 72° F)	1/4	NPT	2 33/64"	Acetylene	__	79215A422	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	__	79215A658	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	__	79215A665	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	__	79215A669	0000
CGA 520 (500 psi @ 72° F)	1/4	NPT	1 3/4"	Acetylene	__	79215A661	0000
CGA 540 (3,000 psi @ 72° F)	1/4	NPT	2 1/16"	Oxygen	__	79215A663	0000
CGA 555 (3,000 psi @ 72° F)	1/4	NPT	2 1/16"	Butane, LP Gas	__	79215A774	0000
CGA 660 (3,000 psi @ 72° F)	1/4	NPT	1 3/4"	Refrigerant Gases	__	79215A717	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F)	1/4	NPT	3"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	__	79215A727	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (5,500 psi @ 72° F)	1/4	NPT	3 1/64"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	Filter	79215A426	00000
CGA 701 (4,700 psi @ 72° F)	1/4	NPT	3"	Oxygen	Filter	79215A425	00000
BS 341 No. 3 (4,350 psi @ 72° F)	1/4	NPT	2 1/2"	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	__	79215A327	00000
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	__	79215A329	00000
Brass—Tighten By Hand
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 33/64"	Carbon Dioxide	__	79215A434	00000
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	__	4183N11	00000
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	__	4183N12	00000
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	__	79215A436	00000
CGA 660 (3,000 psi @ 72° F)	1/4	NPT	1 3/4"	Refrigerant Gases	__	4183N13	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F)	1/4	NPT	3 1/64"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	__	4183N14	00000
Chrome-Plated Brass—Tighten With Wrench
CGA 320 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Dioxide	__	79215A316	00000
CGA 326 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Nitrous Oxide	__	4183N15	00000
CGA 346 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Air	__	4183N16	00000
CGA 350 (3,000 psi @ 72° F)	1/4	NPT	3"	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	__	79215A318	00000
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	__	4183N17	00000
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	__	4183N18	00000
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	__	79215A321	00000
CGA 540 (3,000 psi @ 72° F)	1/4	NPT	2 1/16"	Oxygen	__	79215A323	00000
CGA 660 (3,000 psi @ 72° F)	1/4	NPT	1 3/4"	Refrigerant Gases	__	4183N19	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F)	1/4	__	3 1/64"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	__	4183N21	00000
316 Stainless Steel—Tighten With Wrench
CGA 330 (3,000 psi @ 72° F)	1/4	NPT	2"	Boron Trifluoride, Carbonyl Sulfide, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Silicon Tetrafluoride, Sulfur Tetrafluoride	__	79215A73	00000
CGA 670 (3,000 psi @ 72° F)	1/4	NPT	2 17/64"	Oxygen Mixtures	__	79215A524	00000
CGA 677 (6,400 psi @ 72° F)	1/4	NPT	2 1/2"	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	__	79215A729	00000
CGA 705 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Ammonia	__	79215A427	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 200	Female	0.628"-20	__	NGO	Right Hand	500 psi @ 72° F	Acetylene	79215A648	00000
CGA 280	Female	0.750"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	79215A411	00000
CGA 296	Male	0.803"-14	__	UNS	Right Hand	3,000 psi @ 72° F	Oxygen Mixtures	79215A412	0000
CGA 300	Female	0.830"-14	__	NGO	Right Hand	500 psi @ 72° F	Ethyl Chloride	79215A651	0000
CGA 320	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A653	0000
CGA 326	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Nitrous Oxide	79215A672	0000
CGA 346	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Air	79215A655	0000
CGA 347	Female	0.830"-14	__	NGO	Right Hand	4,700 psi @ 72° F	Air	79215A724	00000
CGA 350	Female	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	Female	0.855"-14	__	NGO	Left Hand	500 psi @ 72° F	Acetylene	79215A413	0000
CGA 500	Male	0.880"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	79215A671	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	79215A657	0000
CGA 520	Female	0.899"-14	__	NGO	Right Hand	500 psi @ 72° F	Acetylene	79215A659	0000
CGA 540	Female	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	79215A662	0000
CGA 555	Female	0.908"-14	__	NGO	Left Hand	3,000 psi @ 72° F	Butane, LP Gas	79215A772	0000
CGA 580	Male	0.960"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A664	0000
CGA 590	Male	0.960"-14	__	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	79215A668	0000
CGA 660	Female	1.035"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Refrigerant Gases	79215A718	00000
CGA 680	Male	1.040"-14	__	NGO	Right Hand	4,700 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A726	00000
CGA 701	Female	1.108"-14	__	NGO	Right Hand	4,700 psi @ 72° F	Oxygen	79215A416	00000
CGA 702	Male	1.120"-14	__	NGO	Right Hand	6,400 psi @ 72° F	Air	79215A417	00000
Brass with Plastic Grip
CGA 320	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A428	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	79215A431	00000
CGA 580	Male	0.960"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A433	00000
CGA 590	Male	0.960"-14	__	UN/UNF (CGA)	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	4183N405	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	79215A311	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	79215A313	00000
BS 341 No. 3	Male	__	5/8	BSPT	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	79215A326	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	79215A328	00000
Chrome-Plated Brass
CGA 320	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Carbon Dioxide	79215A315	00000
CGA 326	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Nitrous Oxide	4183N403	00000
CGA 346	Female	0.830"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Air	4183N404	00000
CGA 350	Female	0.830"-14	__	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	79215A317	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	79215A319	00000
CGA 540	Female	0.908"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Oxygen	79215A322	00000
CGA 580	Male	0.960"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A324	00000
CGA 590	Male	0.960"-14	__	NGO	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	79215A325	00000
Chrome-Plated Brass with Plastic Grip
CGA 500	Male	0.880"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	4183N402	00000
316 Stainless Steel
CGA 330	Female	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	79215A733	00000
CGA 670	Female	1.035"-14	__	NGO	Left Hand	3,000 psi @ 72° F	Hydrogen Fluoride, Nitrogen Trifluoride, Tungsten Hexafluoride	79215A515	00000
CGA 677	Female	1.035"-14	__	NGO	Left Hand	6,400 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A728	00000
CGA 705	Female	1.125"-14	__	UNS	Right Hand	3,000 psi @ 72° F	Ammonia	79215A418	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. 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	Pipe 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
DIN 477 No. 9	__	3/4	BSPT	Right Hand	4,300 psi @ 72° F	Oxygen	79215A811	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
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	79215A311	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	79215A313	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	79215A328	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
CGA 705	1.125"-14	__	UNS	Right Hand	3,000 psi @ 72° F	Ammonia	79215A418	00000

Male

Male Nut

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

Brass
Number	Thread Size	Pipe Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 296	0.803"-14	__	UNS	Right Hand	3,000 psi @ 72° F	Oxygen Mixtures	79215A412	00000
CGA 500	0.880"-14	__	NGO	Right Hand	3,000 psi @ 72° F	Medical Gas Mixtures	79215A671	00000
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
DIN 477 No. 12	__	3/4	BSPT	Right Hand	4,300 psi @ 72° F	Nitrous Oxide	79215A812	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
CGA 590	0.960"-14	__	UN/UNF (CGA)	Left Hand	3,000 psi @ 72° F	Sulfur Hexafluoride	4183N405	00000
Aluminum-Plated Brass
BS 341 No. 3	__	5/8	BSPT	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	79215A326	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 × 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