CONCOA Precision Gas Controls

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
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
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
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
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
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
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
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
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
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
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
CGA 160
Phosgene
CGA 240
CGA 240
Ammonia
CGA 290
CGA 290
Vinyl Bromide, Vinyl Chloride, Vinyl Methyl Ether
CGA 300
CGA 300
Ethyl Chloride
CGA 320
CGA 320
Carbon Dioxide, Methyl Fluoride
CGA 326
CGA 326
Nitrous Oxide
CGA 330
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
CGA 346
Air
CGA 350
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
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
CGA 540
Oxygen
CGA 555
CGA 555
Liquid withdrawl of Butane and Propane
CGA 580
CGA 580
Argon, Helium, Krypton, Neon, Nitrogen, Tetra Fluoro Methane, Xenon
CGA 590
CGA 590
Sulfur Hexafluoride
CGA 670
CGA 670
Bromine Pentafluoride, Bromine Trifluoride, Chlorine Pentafluoride, Chlorine Trifluoride, Deuterium Fluoride, Hydrogen Fluoride, Iodine Pentafluoride, Nitrogen Trifluoride, Perchloryl Fluoride, Tungsten Hexafluoride
CGA 792
CGA 792
Liquid withdrawl of Helium and Neon