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CGA Fitting Reference

A CGA fitting is the standardized system for the attachment of a compressed gas cylinder to the required regulator or transfer line. Examples of CGA fittings would be CGA-580 for Non-flamable, Non-oxidizing gases such as Nitrogen, Argon, or Helium. CGA-590 is used for compressed air and CGA-326 is used for Nitrous Oxide. There are approximately a dozen commonly used CGA-fittings, with others used for special purposes. Select a heading below to get started or type a search term in the box below to quickly filter. There exist more CGA fittings than are listed below, this is not a complete reference.



NOTE: Reference images not drawn to scale.

Looking for CGA Selection Charts? Click here!(.pdf)

a basic visual aid depicting a CGA020 connection

CGA 020 Inlet Connection

Suitable for: Oxygen
Thread Standard: .375-24UNF-2A-RH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 020, 021

a basic visual aid depicting a CGA021 connection

CGA 021 Inlet Connection

Suitable for: Fuel Gases
Thread Standard: .375-24UNF-2A-LH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 020, 021

a basic visual aid depicting a CGA022 connection

CGA 022 Inlet Connection

Suitable for: Oxygen
Thread Standard: .5625-18UNF-2A-RH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 022, 023

a basic visual aid depicting a CGA023 connection

CGA 023 Inlet Connection

Suitable for: Fuel Gases
Thread Standard: .5625-18UNF-2A-LH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 022, 023

a basic visual aid depicting a CGA024 connection

CGA 024 Inlet Connection

Suitable for: Oxygen
Thread Standard: .875-14UNF-2A-RH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 024, 025, 034, 035

a basic visual aid depicting a CGA025 connection

CGA 025 Inlet Connection

Suitable for: Fuel Gases
Thread Standard: .875-14UNF-2A-LH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 024, 025, 034, 035

a basic visual aid depicting a CGA032 connection

CGA 032 Inlet Connection

Suitable for: Inert Gases
Thread Standard: .625-18UNF-2B-RH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 032, 033

a basic visual aid depicting a CGA033 connection

CGA 033 Inlet Connection

Suitable for: Industrial Air, Water
Thread Standard: .625-18UNF-2B-LH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 032, 033

a basic visual aid depicting a CGA034 connection

CGA 034 Inlet Connection

Suitable for: Inert Gases
Thread Standard: .875-14UNF-2B-RH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 024, 025, 034, 035

a basic visual aid depicting a CGA035 connection

CGA 035 Inlet Connection

Suitable for: Industrial Air, Water
Thread Standard: .875-14UNF-2B-LH

Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa).
Typically used for CGA V-1 Connection Number 024, 025, 034, 035

a basic visual aid depicting a CGA160 connection

CGA 160 Inlet Connection

Suitable for: Phosgene
Thread Standard: 1/8-27NGT-RH

Limited standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR PHOSGENE.

a basic visual aid depicting a CGA240 connection

CGA 240 Inlet Connection

Suitable for: Ammonia
Thread Standard: 3/8-18NGT-RH

Standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR AMMONIA.

a basic visual aid depicting a CGA290 connection

CGA 290 Inlet Connection

Suitable for: Vinyl Bromide, Vinyl Chloride, Vinyl Methyl Ether
Thread Standard: .745-14NGO-LH

Standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR VINYL BROMIDE, VINYL CHLORIDE, VINYL METHYL ETHER.

a basic visual aid depicting a CGA300 connection

CGA 300 Inlet Connection

Suitable for: Ethyl Chloride
Thread Standard: .825-14NGO-RH (Conical Nipple)

Standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR ETHYL CHLORIDE.

a basic visual aid depicting a CGA320 connection

CGA 320 Inlet Connection

Suitable for: Carbon Dioxide, some gas mixtures - see CGA V-7 for further reference.
Thread Standard: .825-14NGO-RH (Flat Nipple)

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR CARBON DIOXIDE.

a basic visual aid depicting a CGA326 connection

CGA 326 Inlet Connection

Suitable for: Nitrous Oxide.
Thread Standard: .825-14NGO-RH (Small Round Nipple)

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR NITROUS OXIDE.

a basic visual aid depicting a CGA330 connection

CGA 330 Inlet Connection

Suitable for: Antimony Pentafluoride, Boron Trifluoride, Carbonyl Sulfide, Deuterium Chloride, Deuterium Sulfide, Germanium Tetrafluoride, Hexafluoroacetone, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Methyl Mercaptan, Nitrogen Trifluoride, Nitrosyl Chloride, Nitrosyl Fluoride, Nitryl Fluoride, Phenylcarbylamine Chloride, Phosphorous Pentafluoride, Phosphorous Trifluoride, Silicon Tetrafluoride, Sulfur Tetrafluoride, Trifluoroacetyl Chloride, Uranium Hexafluoride.
Thread Standard: .825-14NGO-LH (Flat Nipple)

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR ABOVE GASES.

a basic visual aid depicting a CGA346 connection

CGA 346 Inlet Connection

Suitable for: Air.
Thread Standard: .825-14NGO-RH (Large Round Nipple)

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR AIR.

a basic visual aid depicting a CGA350 connection

CGA 350 Inlet Connection

Suitable for: Arsine, Carbon Monoxide, Deuterium, Deuterium Selenide, Diborane, 1,1 Difluoroethylene, Ethane, Ethylene, Germane, Hydrogen, Hydrogen Selenide, Methane, Methyl Fluoride, Methylene Fluoride, Natural Gas, Pentaborane, Perfluorobutadiene, Phosphine, Silane, Stibine, Tetrafluoroethylene, Vinyl Fluoride.
Thread Standard: .825-14NGO-LH (Large Round Nipple)

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR ABOVE GASES.

a basic visual aid depicting a CGA510 connection

CGA 510 Inlet Connection

Suitable for: Acetylene, Allene, Bromotrifluoroethylene, 1,3-Butadiene, Butane, 1-Butene, 2-Butene, 1-Chloro-1,1-difluoroethane, Chlorofluoromethane, Chlorotrifluoroethylene, Cyclobutane, Cyclopropane, Diethylzinc, 1,1-Difluoroethane, Dimethyl Ether, 2,2 Dimethylpropane, Ethylacetylene, Ethylene Oxide, Ethyl Ether, Isobutane, Isobutylene, Methane, Methylacetylene, 3-Methyl-1-Butene, Methyl Chloride, Methyl Ethyl Ether, Natural Gas, Propane, Propylene, Silane, Triethylaluminum, 1,1,1 Trifluoroethane Trifluoroethylene, Vinyl Bromide, Vinyl Chloride, Vinyl Methyl Ether
Thread Standard: .885-14NGO-LH (Bullet Nipple)

Standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR ABOVE GASES.

a basic visual aid depicting a CGA540 connection

CGA 540 Inlet Connection

Suitable for: Oxygen
Thread Standard: .903-14NGO-RH

Standard cylinder valve outlet connection for pressures up to 500 psig (3,450 kPa) FOR OXYGEN ONLY.

a basic visual aid depicting a CGA555 connection

CGA 555 Inlet Connection

Suitable for: Liquid withdrawal of Butane and Propane
Thread Standard: .903-14NGO-LH

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR LIQUID WITHDRAWAL OF BUTANE AND PROPANE.

a basic visual aid depicting a CGA580 connection

CGA 580 Inlet Connection

Suitable for: Argon, Helium, Krypton, Neon, Nitrogen, Tetra Fluoro Methane, Trichloroethylene, Xenon
Thread Standard: .965-14NGO-RH

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR ABOVE GASES.

a basic visual aid depicting a CGA590 connection

CGA 590 Inlet Connection

Suitable for: Sulfur Hexafluoride
Thread Standard: .965-14NGO-LH

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR SULFUR HEXAFLUORIDE.

a basic visual aid depicting a CGA670 connection

CGA 670 Inlet Connection

Suitable for: Bromine Pentafluoride, Bromine Trifluoride, Chlorine Pentafluoride, Chlorine Trifluoride, Deuterium Fluoride, Hydrogen Fluoride, Iodine Pentafluoride, Nitrogen Trifluoride, Perchloryl Fluoride, Tungsten Hexafluoride
Thread Standard: 1.030-14NGO-LH

Standard cylinder valve outlet connection for pressures up to 3000 psig (20,680 kPa) FOR ABOVE GASES.

a basic visual aid depicting a CGA792 connection

CGA 792 Inlet Connection

Suitable for: Cryogenic liquid withdrawal of Helium and Neon
Thread Standard: 1.500-12UNF-2A-RH

Standard cylinder valve outlet connection for pressures up to 140 psig (970 kPa) FOR CRYOGENIC LIQUID WITHDRAWAL OF HELIUM AND NEON.

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