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 gasses 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.
CONNECTION |
USE / DESCRIPTION |
CGA 020 |
|
Oxygen (A Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa). Cylinder valve outlet thread:
.375-24UNF-2A-RH-EXT
Typically used for CGA V-1 Connection Number 020, 021
Valve Outlet Dimensions
Minor Diameter = .3228 REF
Pitch Diameter = .3468 - .3430
Major Diameter = .3739 - .3667
Connection Nut Dimensions
Major Diameter = .375 Minimum
Pitch Diameter = .3479 - .3528
Minor Diameter = .330 - .340
|
CGA 021 |
|
Fuel Gases (A Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.375-24UNF-2A-LH-EXT
Typically used for CGA V-1 Connection Number 020, 021
Valve Outlet Dimensions
Minor Diameter = .3228 REF
Pitch Diameter = .3468 - .3430
Major Diameter = .3739 - .3667
Connection Nut Dimensions
Major Diameter = .375 Minimum
Pitch Diameter = .3479 - .3528
Minor Diameter = .330 - .340
|
CGA 022 |
|
Oxygen (B Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.5625-18UNF-2A-RH-EXT
Typically used for CGA V-1 Connection Number 022, 023
Valve Outlet Dimensions
Minor Diameter = .4929 REF
Pitch Diameter = .5250 - .5205
Major Diameter = .5611 - .5524
Connection Nut Dimensions
Major Diameter = .5625 Minimum
Pitch Diameter = .5264 - .5323
Minor Diameter = .502 - .515
|
CGA 023 |
|
Fuel Gases (B Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.5625-18UNF-2A-LH-EXT
Typically used for CGA V-1 Connection Number 022, 023
Valve Outlet Dimensions
Minor Diameter = .4929 REF
Pitch Diameter = .5250 - .5205
Major Diameter = .5611 - .5524
Connection Nut Dimensions
Major Diameter = .5625 Minimum
Pitch Diameter = .5264 - .5323
Minor Diameter = .502 - .515
|
CGA 024 |
|
Oxygen (C Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.875-14UNF-2A-RH-EXT
Typically used for CGA V-1 Connection Number 024, 025, 034, 035
Valve Outlet Dimensions
Minor Diameter = .7858 REF
Pitch Diameter = .8270 - .8216
Major Diameter = .8734 - .8631
Connection Nut Dimensions
Major Diameter = .875 Minimum
Pitch Diameter = .8286 - .8356
Minor Diameter = .798 - .814
|
CGA 025 |
|
Fuel Gases (C Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.875-14UNF-2A-LH-EXT
Typically used for CGA V-1 Connection Number 024, 025, 034, 035
Valve Outlet Dimensions
Minor Diameter = .7858 REF
Pitch Diameter = .8270 - .8216
Major Diameter = .8734 - .8631
Connection Nut Dimensions
Major Diameter = .875 Minimum
Pitch Diameter = .8286 - .8356
Minor Diameter = .798 - .814
|
CGA 032 |
|
Inert Gases (B Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.625-18UNF-2B-RH-INT
Typically used for CGA V-1 Connection Number 032, 033
Valve Outlet Dimensions
Minor Diameter = .565 - 578
Pitch Diameter = .5889 - .5949
Major Diameter = .625 Minimum
Connection Nut Dimensions
Major Diameter = .6236 - .6149
Pitch Diameter = .5875 - .5828
Minor Diameter = .5554 REF
|
CGA 033 |
|
Industrial Air, Water (B Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.625-18UNF-2B-LH-INT
Typically used for CGA V-1 Connection Number 032, 033
Valve Outlet Dimensions
Minor Diameter = .565 - 578
Pitch Diameter = .5889 - .5949
Major Diameter = .625 Minimum
Connection Nut Dimensions
Major Diameter = .6236 - .6149
Pitch Diameter = .5875 - .5828
Minor Diameter = .5554 REF
|
CGA 034 |
|
Inert Gases (C Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.875-14UNF-2B-RH-INT
Typically used for CGA V-1 Connection Number 024, 025, 034, 035
Valve Outlet Dimensions
Minor Diameter = .7858 REF
Pitch Diameter = .8270 - .8216
Major Diameter = .8734 - .8631
Connection Nut Dimensions
Major Diameter = .875 Minimum
Pitch Diameter = .8286 - .8356
Minor Diameter = .798 - .814
|
CGA 035 |
|
Industrial Air, Water (C Fitting)
Standard cylinder valve outlet connection for pressures up to 200 psig (1,380 kPa):
.875-14UNF-2B-LH-INT
Typically used for CGA V-1 Connection Number 024, 025, 034, 035
Valve Outlet Dimensions
Minor Diameter = .7858 REF
Pitch Diameter = .8270 - .8216
Major Diameter = .8734 - .8631
Connection Nut Dimensions
Major Diameter = .875 Minimum
Pitch Diameter = .8286 - .8356
Minor Diameter = .798 - .814
|
CGA 160 |
|
Phosgene |
CGA 240 |
|
Ammonia |
CGA 290 |
|
Vinyl Bromide, Vinyl Chloride, Vinyl Methyl Ether |
CGA 300 |
|
Ethyl Chloride |
CGA 320 |
|
Carbon Dioxide, Methyl Fluoride |
CGA 326 |
|
Nitrous Oxide |
CGA 330 |
|
Antimony Pentafluoride, Boron Trifluoride, Carbonyl Sulfide, Deuterium Chloride, Deuterium Sulfide, 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 |
CGA 346 |
|
Air |
CGA 350 |
|
Arsine, Carbon Monoxide, Deuterium, Deuterium Selenide, Diborane, 1,1 Difluoroethylene, Ethane, Ethylene, Germane, Hydrogen, Hydrogen Selenide, Methane, Methyl Fluoride, Methylene Fluoride, Natural Gas, Pentaborane, Phosphine, Silane, Stibine, Tetrafluoroethylene, Vinyl Fluoride |
CGA 510 |
|
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 |
CGA 540 |
|
Oxygen |
CGA 555 |
|
Liquid withdrawl of Butane and Propane |
CGA 580 |
|
Argon, Helium, Krypton, Neon, Nitrogen, Tetra Fluoro Methane, Xenon |
CGA 590 |
|
Sulfur Hexafluoride |
CGA 670 |
|
Bromine Pentafluoride, Bromine Trifluoride, Chlorine Pentafluoride, Chlorine Trifluoride, Deuterium Fluoride, Hydrogen Fluoride, Iodine Pentafluoride, Nitrogen Trifluoride, Perchloryl Fluoride, Tungsten Hexafluoride |
CGA 792 |
|
Liquid withdrawl of Helium and Neon |
|
