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)
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
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
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
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
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
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
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
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
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.