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Compressed Gas Cylinder Outlet Connections

For Reference Information Only


In these tables you will find the most common compressed gas cylinder outlet connections used with the gases and gas mixtures. The tables refer to the standards implemented in different countries, sometimes the with small variations. The DIN standard is used in most European countries. The tables are listed for various countries. This information is supplied for reference only and connectors are not available for sale.

Connection Threads:
  • Right handed, external thread is the normal thread and does not have an additional annotation.
  • Left handed thread has the LH annotation.
  • Internal thread has the INT annotation.

 

  USA & Canada – CGA
Argentina – IRAM 2539
Australia and New Zealand – AS 2473.2
Brazil – ABNT
France – AFNOR
Germany (and most European countries) - DIN 477
Italy - UNI
Netherlands - NEN 3268
Spain – ITC EP6
UK - BS 341

 

 
USA & Canada - CGA
Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
CGA 110 0.3125 - 32 UNEF INT All Gases Small Cylinders
CGA 170 9/16" - 18 UNF INT Argon, Helium Non Corrosive, Small Cylinders
CGA 180 5/8" - 18 UNF INT All Gases Small Cylinders
CGA 240 3/8" - 18 NPT Ammonia Toxic
CGA 296 0.803" - 14 UNS INT Oxygen Mix > 23% Oxidizing Mixtures
CGA 300 0.825" - 14 NGO Ethyl Chloride Refrigerant
CGA 320 0.825" - 14 NGO Carbon Dioxide Non Flammable
CGA 326 0.825" - 14 NGO Air Oxidizer
CGA 330 0.825" - 14 NGO LH Hydrogen Chloride Toxic
CGA 346 0.825" - 14 NGO Air Oxidizer
CGA 350 0.825" - 14 NGO LH Hydrogen, Methane Flammable
CGA 510 0.825" - 14 NGO LH INT Propane Flammable
CGA 540 0.903" - 14 NGO Oxygen Oxidizer
CGA 580 0.965" - 14 NGO INT Argon, Nitrogen Inerts
CGA 590 0.965" - 14 NGO LM INT Air Oxidizer
CGA 660 1.030" - 14 NGO Hydrogen Sulphide Toxic
CGA 679 1.030" - 14 NGO LH Nitrogen High Pressure
CGA 705 1.125" - 14 UNS Ammonia Toxic

 

Argentina - IRAM 2539

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
IRAM 2539 No. 1 3/4" BSP x 1/14" - INT Acetylene Flammable
IRAM 2539 No. 2 W 21.8 - 1 1/4 Oxygen, Sulphur Hexafluoride Various
IRAM 2539 No. 3 5/8" BSP - INT Argon, Nitrogen Non Flammable
IRAM 2539 No. 4 W 21.8 - 1/4 Ethane, Hydrogen Flammable
IRAM 2539 No. 5 3/8" BSP - INT Nitrous Oxide Oxidizer

 

Australia and New Zealand – AS 2473.2

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
Type 10 G 5/8" RH INT Argon, Helium, Oxygen =< 20,000 kPa Non Flammable
Type 11 G 5/8" RH INT Extended nipple Oxygen >20,000 kPa, =< 25,000 kPa Oxidizer
Type 20 G 5/8" LH INT Acetylene, Hydrogen, Ethylene, Methane Flammable
Type 21 0.885" - 14 NGO LH INT LPG, Propane Flammable
Type 30 0.860" - 14 BSW RH EXT Carbon Dioxide, Nitrous Oxide Non Flammable / Oxidizer
Type 31 G 5/8" Sulphur Hexafluoride, Phosgene, Methyl Bromide Chemical Gases
Type 32 G 1/2" Ammonia, Sulphur Dioxide Toxic
Type 33 G 1/4" Small cyls <4.5l water capacity Non Toxic, Non Flammable Mixtures
Type 34 G 3/4" R134a Refrigerant
Type 40 G 5/8" LH EXT Ethylene Oxide Toxic
Type 41 G 3/8" BSP LH EXT LPG, Propane Flammable
Type 42 G 1/2" LH EXT Methylamine Toxic
Type 43 0.825" - 14 NGO LH EXT Hydrogen Chloride, Hydrogen Sulphide Toxic / Corrosive
Type 44 G 3/8" BSP Calibration gas mixtures Toxic, Non Flammable Mixtures
Type 50 24x2 Whit Nitrogen =<20,000 kPa Inert
Type 51 1.045" - 14 NGO RH INT Nitrogen >20,000 kPa Inert
Type 60 27x2 Whit Air =<20,000 kPa Non Flammable
Type 61 0.825" - 14 NGO Air >20,000 kPa Non Flammable

 

Brazil – ABNT

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
ABNT 172-1 3/8" -18 NGT INT Ammonia Toxic
ABNT 218-1 W 21.8 x 1/14" INT Air, Oxygen, Oxygen Mix >20% Oxidizer
ABNT 218-2 W 21.8 x 1/14" LH INT Hydrogen, Methane Flammable
ABNT 225-2 0.885" - 14 NGO LH Acetylene, Butane Flammable
ABNT 245-1 0.960" - 14 NGO Argon, Helium, Nitrogen Inerts
ABNT 245-1 0.960" - 14 NGO Inert gases + Oxygen Mix <20% Inerts
ABNT 245-2 0.960" - 14 NGO LH Sulphur Hexafluoride Non Flammable
ABNT 262-1 1.035" - 14 NGO INT Sulphur Dioxide, Chlorine Toxic
ABNT 209-1 0.830" - 14 NGO INT Carbon Dioxide Non Flammable
ABNT 209-2 0.830" - 14 NGO LH INT
(Round Nipple)
Carbon Monoxide, Phosphine, Silane Toxic, Flammable
ABNT 209-4 0.830" - 14 NGO LH INT
(Flat Nipple)
Hydrogen Chloride, Hydrogen Sulphide Toxic
ABNT 166-1 G 3/8" A - ISO 228-1 Nitrous Oxide Oxidizer

 

France – AFNOR

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
NF B W 30 x 1.75 Industrial Air Oxidizer
NF C SI 21.7 x 1.814 Argon, Helium, Nitrogen Inert Gases
NF E SI 21.7 x 1.814 LH Hydrogen, Hydrogen Mix >4% Flammable
NF F SI 22.94 x 1.814 INT Oxygen Oxidizer
NF G SI 26 x 1.5 INT Nitrous Oxide Oxidizer
NF H W 22.91 x 1.814 LH INT Acetylene Flammable
NF J W 25.4 x 3.175 Chlorine Corrosive
NF K W 27 x 2 Hydrogen Chloride Corrosive
NF L W 27 x 2 Inert gases + Oxygen Mix > 21% Oxidizer
NF M W 30 x 2 Inert gases + Oxygen Mix > 21% & CO2 < 7% Oxidizer
NF P W 27 x 2 Nitric Oxide, Nitrogen Dioxide Oxidizer or Corrosive

 

Germany (and most European countries) - DIN 477

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
DIN 477 No. 1 W 21.8 x 1/14" LH Hydrogen, Propane Flammable
DIN 477 No. 2 W 21.8" x 1/14" LH Propane Flammable
DIN 477 No. 3 Yoke Acetylene Flammable
DIN 477 No. 3.1 M 24 x 2" LH Acetylene Flammable
DIN 477 No. 5 W 1" x 1/8" LH Carbon Monoxide Toxic
DIN 477 No. 6 W 21.8 x 1/14" Argon, Helium, Carbon Dioxide Various
DIN 477 No. 7 G 5/8" Sulphur Dioxide Toxic
DIN 477 No. 8 W 1" x 1/8" Boron Trichloride Toxic
DIN 477 No. 9 G 3/4" Oxygen Oxidizer
DIN 477 No. 10 W 24.32 x 1/14" RH Nitrogen Inerts
DIN 477 No. 11 G 3/8" Nitrous Oxide (>3 l size) Oxidizer
DIN 477 No. 12 G 3/4" INT Nitrous Oxide (<3 l size) Oxidizer
DIN 477 No. 13 G 5/8" INT Air Non Flammable
DIN 477 No. 14 M 19 x 1.5 LH Mixtures Various

 

Italy - UNI

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
UNI 4405 W 20 x 1/14" LH Hydrogen Flammable
UNI 4406 W 21.7 x 1/14" Carbon Dioxide, Oxygen Non Flammable / Oxidizer
UNI 4407 W 30 x 1/14" Ammonia Toxic
UNI 4408 W 1" x 1/8" Chlorine Toxic
UNI 4409 W 21.7 x 1/14" Nitrogen Inert
UNI 4410 W 30 x 1/14" Air Non Flammable
UNI 4411 W 22.9 x 1/14" Acetylene Flammable
UNI 4412 W 24.5 x 1/14" Argon, Helium Inerts
UNI 9097 G 3/8" EXT Nitrous Oxide Oxidizer

 

Netherlands - NEN 3268

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
LU 0 M 19 x 1.5 LH Flammable Mixtures Flammable Mixtures
LU 1 W 21.8 - 1/14" LH Hydrogen, Methane Flammable
LU 4 W 25.4 x 3.175" LH Hydrogen Cyanide Toxic
RI 2 G 22.91 x 1.814" RH Oxygen Oxidizer
RU 1 W 21.8 - 1/14" Ammonia, Carbon Dioxide Refigerants
RU 3 W 24.32 - 1/14" Argon, Helium, Nitrogen Inerts
RU 4 W 25.4 x 3.175" RH Chlorine, Hydrogen Chloride, Sulphur Dioxide Toxic
RU 6 W 28.81 x 1.814" RH Air Oxidizer

 

Spain – ITC EP6

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
TIPO B M 30 x 1.75 Air Non Flammable
TIPO C W 21.7 x 1/14" Argon, Helium, Nitrogen Inerts
TIPO E W 21.7 x 1/14" LH Hydrogen, Methane, Propane Flammable
TIPO F G 5/8" INT Oxygen Oxidizer
TIPO G M 26 x 1.5 INT Oxygen Mix > 23% Oxidizing Mixtures
TIPO H G 5/8" LH INT Acetylene Flammable
TIPO J W 1" Hydrogen Chloride, Hydrogen Bromide Toxic and Corrosive
TIPO M M 19 x 1.5 LH Calibration Gas Mixtures Mixtures
TIPO T W 31.75 x 1/7" 237 Chlorine Drum Tanks Toxic or Corrosive
TIPO U G 3/8" Nitrous Oxide Oxidizer

 

UK - BS 341

Connector
Type
Connector
Thread
Gas or
Gas Mixture
Remarks
BS 341 No. 2 G 5/8" LH Acetylene Flammable
BS 341 No. 3 G 5/8" INT Air, Argon, Neon, Nitrogen Inerts
BS 341 No. 3 G 5/8" INT Oxygen Oxidizer
BS 341 No. 4 G 5/8" LH INT Acetylene, Hydrogen Flammable
BS 341 No. 4 G 5/8" LH INT Carbon Monoxide, Methane, Natural Gas Flammable
BS 341 No. 6 G 5/8" Chlorine, Hydrogen Chloride Toxic
BS 341 No. 7 G 5/8" LH Flammable Refrigerants Flammable Refrigerants
BS 341 No. 8 W 0.860" x 14 TPI Carbon Dioxide Non Flammable
BS 341 No. 10 G 1/2" Ammonia Toxic
BS 341 No. 12 G 1/2" Sulphur Dioxide Toxic
BS 341 No. 13 W 11/16" - 20 TPI Nitrous Oxide Oxidizer
BS 341 No. 14 G 3/8" Hydrogen Cyanide, Nitric Oxide Toxic
BS 341 No. 15 G 3/8" LH Carbonyl Sulphide, Hydrogen Sulphide Toxic