The standards referred to are occasionally implemented with slight variations in the countries where the standard applies, eg DIN in Europe. Right handed, external thread is the normal tread unless LH (left handed) on INT (Internal) is annotated. If required, the actual cylinder outlet should be confirmed with your local supplier at the time of supply.
Please select your connection type below:
ABNT (Associação Brasileira de Normas Técnicas)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
ABNT 172-1 | 3/8" -18 NGT INT | Toxic | Ammonia |
ABNT 218-1 | W 21.8 x 1/14" INT | Oxidiser | Air, Oxygen, Oxygen Mix >20% |
ABNT 218-2 | W 21.8 x 1/14" LH INT | Flammable | Hydrogen, Methane |
ABNT 225-2 | 0.885" - 14 NGO LH | Flammable | Acetylene, Butane |
ABNT 245-1 | 0.960" - 14 NGO | Inert | Argon, Helium, Nitrogen |
ABNT 245-1 | 0.960" - 14 NGO | Inert | Inert gases + Oxygen Mix <20% |
ABNT 245-2 | 0.960" - 14 NGO LH | Non Flammable | Sulphur Hexafluoride |
ABNT 262-1 | 1.035" - 14 NGO INT | Toxic | Sulphur Dioxide, Chlorine |
ABNT 209-1 | 0.830" - 14 NGO INT | Non Flammable | Carbon Dioxide |
ABNT 209-2 | 0.830" - 14 NGO LH INT (Round Nipple) | Toxic, Flammable | Carbon Monoxide, Phosphine, Silane |
ABNT 209-4 | 0.830" - 14 NGO LH INT (Flat Nipple) | Toxic | Hydrogen Chloride, Hydrogen Sulphide |
ABNT 166-1 | G 3/8" A - ISO 228-1 | Oxidiser | Nitrous Oxide |
AFNOR (Association Française de Normalisation)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
NF B | W 30 x 1.75 | Oxidiser | Industrial Air |
NF C | SI 21.7 x 1.814 | Inert Gases | Argon, Helium, Nitrogen |
NF E | SI 21.7 x 1.814 LH | Flammable | Hydrogen, Hydrogen Mix >4% |
NF F | SI 22.94 x 1.814 INT | Oxidiser | Oxygen |
NF G | SI 26 x 1.5 INT | Oxidiser | Nitrous Oxide |
NF H | W 22.91 x 1.814 LH INT | Flammable | Acetylene |
NF J | W 25.4 x 3.175 | Corrosive | Chlorine |
NF K | W 27 x 2 | Corrosive | Hydrogen Chloride |
NF L | W 27 x 2 | Oxidiser | Inert gases + Oxygen Mix > 21% |
NF M | W 30 x 2 | Oxidiser | Inert gases + Oxygen Mix > 21% & CO2 < 7% |
NF P | W 27 x 2 | Oxidiser or corrosive | Nitric Oxide, Nitrogen Dioxide |
BS 341 (British Standard)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
BS 341 No. 2 | G 5/8" LH | Flammable | Acetylene |
BS 341 No. 3 | G 5/8" INT | Inert | Air, Argon, Neon, Nitrogen |
BS 341 No. 3 | G 5/8" INT | Oxidiser | Oxygen |
BS 341 No. 4 | G 5/8" LH INT | Flammable | Acetylene, Hydrogen |
BS 341 No. 4 | G 5/8" LH INT | Flammable | Carbon Monoxide, Methane, Natural Gas |
BS 341 No. 6 | G 5/8" | Toxic | Chlorine, Hydrogen Chloride |
BS 341 No. 7 | G 5/8" LH | Flammable Refrigerants | Flammable Refrigerants |
BS 341 No. 8 | W 0.860" x 14 TPI | Non Flammable | Carbon Dioxide |
BS 341 No. 10 | G 1/2" | Toxic | Ammonia |
BS 341 No. 12 | G 1/2" | Toxic | Sulphur Dioxide |
BS 341 No. 13 | W 11/16" - 20 TPI | Oxidiser | Nitrous Oxide |
BS 341 No. 14 | G 3/8" | Toxic | Hydrogen Cyanide, Nitric Oxide |
BS 341 No. 15 | G 3/8" LH | Toxic | Carbonyl Sulphide, Hydrogen Sulphide |
CGA (US Compressed Gas Association)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
CGA 110 | 0.3125 - 32 UNEF INT | Small Cylinders | All Gases |
CGA 170 | 9/16" - 18 UNF INT | Non Corrosive, Small Cylinders |
Argon, Helium |
CGA 180 | 5/8" - 18 UNF INT | Small Cylinders | All Gases |
CGA 240 | 3/8" - 18 NPT | Toxic | Ammonia |
CGA 296 | 0.803" - 14 UNS INT | Oxidising Mixtures | Oxygen Mix > 23% |
CGA 300 | 0.825" - 14 NGO | Refrigerant | Ethyl Chloride |
CGA 320 | 0.825" - 14 NGO | Non Flammable | Carbon Dioxide |
CGA 326 | 0.825" - 14 NGO | Oxidiser | Air |
CGA 330 | 0.825" - 14 NGO LH | Toxic | Hydrogen Chloride |
CGA 346 | 0.825" - 14 NGO | Oxidiser | Air |
CGA 350 | 0.825" - 14 NGO LH | Flammable | Hydrogen, Methane |
CGA 510 | 0.825" - 14 NGO LH INT | Flammable | Propane |
CGA 540 | 0.903" - 14 NGO | Oxidiser | Oxygen |
CGA 580 | 0.965" - 14 NGO INT | Inert | Argon, Nitrogen |
CGA 590 | 0.965" - 14 NGO LM INT | Oxidiser | Air |
CGA 330 | 1.030" - 14 NGO | Toxic | Hydrogen Sulphide |
CGA 679 | 1.030" - 14 NGO LH | High Pressure | Nitrogen |
CGA 705 | 1.125" - 14 UNS LH | Toxic | Ammonia |
DIN 477 (Deutsche Industrie Norm)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
DIN 477 No. 1 | W 21.8 x 1/14" LH | Flammable | Hydrogen, Propane |
DIN 477 No. 2 | W 21.8" x 1/14" LH | Flammable | Propane |
DIN 477 No. 3 | Yoke | Flammable | Acetylene |
DIN 477 No. 3.1 | M 24 x 2" LH | Flammable | Acetylene |
DIN 477 No. 5 | W 1" x 1/8" LH | Toxic | Carbon Monoxide |
DIN 477 No. 6 | W 21.8 x 1/14" | Various | Argon, Helium, Carbon Dioxide |
DIN 477 No. 7 | G 5/8" | Toxic | Sulphur Dioxide |
DIN 477 No. 8 | W 1" x 1/8" | Toxic | Boron Trichloride |
DIN 477 No. 9 | G 3/4" | Oxidiser | Oxygen |
DIN 477 No. 10 | W 24.32 x 1/14" RH | Inerts | Nitrogen |
DIN 477 No. 11 | G 3/8" | Oxidiser | Nitrous Oxide (>3 l size) |
DIN 477 No. 12 | G 3/4" INT | Oxidiser | Nitrous Oxide (<3 l size) |
DIN 477 No. 13 | G 5/8" INT | Non Flammable | Air |
DIN 477 No. 14 | M 19 x 1.5 LH | Various | Mixtures |
IRAM 2539 (Instituto Argentino de Racionalización de Materiales)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
IRAM 2539 No. 1 | 3/4" BSP x 1/14" - INT | Flammable | Acetylene |
IRAM 2539 No. 2 | W 21.8 - 1 1/4 | Various | Oxygen, Sulphur Hexafluoride |
IRAM 2539 No. 3 | 5/8" BSP - INT | Non Flammable | Argon, Nitrogen |
IRAM 2539 No. 4 | W 21.8 - 1/4 | Flammable | Ethane, Hydrogen |
IRAM 2539 No. 5 | 3/8" BSP - INT | Oxidiser | Nitrous Oxide |
ISO 5145 (Provisional standard, previously NEVOC)
Connector type |
Connector description |
Generic gas property |
Example gases & mixtures components |
ISO 5145 No.1 | W 24 x 2 11,2 - 16,8 RH | Inert | Medical Helium & Xenon |
ISO 5145 No.2 | W 24 x 2 11,9 - 16,1 RH | Oxidiser | Oxygen |
ISO 5145 No.4 | W 24 x 2 13,3 - 14,7 RH | Inert | Inert gases & mixes, except He & Xe |
ISO 5145 No.9 | W 24 x 2 13,3 - 14,7 LH | Flammable | Mixes with a flammable gas, except Hydrogen |
ISO 5145 No.10 | W 24 x 2 14 - 14 LH | Flammable | Hydrogen |
ISO 5145 No.11 | W 27 x 2 11,8 - 20,2 RH | Inert | Nitrogen |
ISO 5145 No.17 | W 27 x 2 16 - 16 RH | Inert | Carbon Dioxide |
ISO 5145 No.24 | W 27 x 2 16 - 16 LH | Flammable | LPG |
ISO 5145 No.30 | W 30 x 2 15,9 - 20,1 RH | Inert | Helium, Argon, Nitrogen, inert mixes* |
ISO 5145 No.32 | W 30 x 2 17,3 - 18,7 RH | Oxidiser | Oxygen* |
ISO 5145 No.38 | W 30 x 2 15,2 - 20,8 LH | Flammable | Mixes with a flammable gas* |
ISO 5145 No.41 | W 30 x 2 17,3 - 18,7 LH | Refrigerants | Refrigerant gases** |
** Flammable according to ISO 5145, for inert No. 4 can be used when FTSC codes fit with the mixture
ITC EP-6 (Instrucción Técnica Complemetaria - Equipos Presión)
Connector type |
Connector description |
Generic gas property |
Example gases & mixtures components |
TIPO B | M 30 x 1.75 | Non Flammable | Air |
TIPO C | W 21.7 x 1/14" | Inert | Argon, Helium, Nitrogen |
TIPO E | W 21.7 x 1/14" LH | Flammable | Hydrogen, Methane, Propane |
TIPO F | G 5/8" INT | Oxidiser | Oxygen |
TIPO G | M 26 x 1.5 INT | Oxidising mixtures | Oxygen Mix > 23% |
TIPO H | G 5/8" LH INT | Flammable | Acetylene |
TIPO J | W 1" | Toxic and Corrosive | Hydrogen Chloride, Hydrogen Bromide |
TIPO M | M 19 x 1.5 LH | Mixtures | Calibration Gas Mixtures |
TIPO T | W 31.75 x 1/7" 237 | Toxic or Corrosive | Chlorine Drum Tanks |
TIPO U | G 3/8" | Oxidiser | Nitrous Oxide |
NEN 3268 (Nederlandse Norm)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
LU 0 | M 19 x 1.5 LH | Flammable Mixtures | Flammable Mixtures |
LU 1 | W 21.8 - 1/14" LH | Flammable | Hydrogen, Methane |
LU 4 | W 25.4 x 3.175" LH | Toxic | Hydrogen Cyanide |
RI 2 | G 22.91 x 1.814" RH | Oxidiser | Oxygen |
RU 1 | W 21.8 - 1/14" | Refigerants | Ammonia, Carbon Dioxide |
RU 3 | W 24.32 - 1/14" | Inert | Argon, Helium, Nitrogen |
RU 4 | W 25.4 x 3.175" RH | Toxic | Chlorine, Hydrogen Chloride, Sulphur Dioxide |
RU 6 | W 28.81 x 1.814" RH | Oxidiser | Air |
UNI (Ente Nazionale Italiano di Unificazione)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
UNI 4405 | W 20 x 1/14" LH | Flammable | Hydrogen |
UNI 4406 | W 21.7 x 1/14" | Non Flammable / Oxidiser | Carbon Dioxide, Oxygen |
UNI 4407 | W 30 x 1/14" | Toxic | Ammonia |
UNI 4408 | W 1" x 1/8" | Toxic | Chlorine |
UNI 4409 | W 21.7 x 1/14" | Inert | Nitrogen |
UNI 4410 | W 30 x 1/14" | Non Flammable | Air |
UNI 4411 | W 22.9 x 1/14" | Flammable | Acetylene |
UNI 4412 | W 24.5 x 1/14" | Inert | Argon, Helium |
UNI 9097 | G 3/8" EXT | Oxidiser | Nitrous Oxide |
AS 2473.2 (Australian Standard)
Connector type |
Connector description |
Generic gas property |
Example gases or mixtures components |
Type 10 | G 5/8" RH INT | Non Flammable | Argon, Helium, Oxygen =< 20,000 kPa |
Type 11 | G 5/8" RH INT Extended nipple |
Oxidiser | Oxygen >20,000 kPa, =< 25,000 kPa |
Type 20 | G 5/8" LH INT | Flammable | Acetylene, Hydrogen, Ethylene, Methane |
Type 21 | 0.885" - 14 NGO LH INT | Flammable | LPG, Propane |
Type 30 | 0.860" - 14 BSW RH EXT | Non Flammable / Oxidiser | Carbon Dioxide, Nitrous Oxide |
Type 31 | G 5/8" | Chemical Gases | Sulphur Hexafluoride, Phosgene, Methyl Bromide |
Type 32 | G 1/2" | Toxic | Ammonia, Sulphur Dioxide |
Type 33 | G 1/4" | Non Toxic, Non Flammable Mixtures | Small cyls <4.5l water capacity |
Type 34 | G 3/4" | Refrigerants | R134a |
Type 40 | G 5/8" LH EXT | Toxic | Ethylene Oxide |
Type 41 | G 3/8" BSP LH EXT | Flammable | LPG, Propane |
Type 42 | G 1/2" LH EXT | Toxic | Methylamine |
Type 43 | 0.825" - 14 NGO LH EXT | Toxic / Corrosive | Hydrogen Chloride, Hydrogen Sulphide |
Type 44 | G 3/8" BSP | Toxic, Non Flammable Mixtures | Calibration gas mixtures |
Type 50 | 24x2 Whit | Inert | Nitrogen =<20,000 kPa |
Type 51 | 1.045" - 14 NGO RH INT | Inert | Nitrogen >20,000 kPa |
Type 60 | 27x2 Whit | Non Flammable | Air =<20,000 kPa |
Type 61 | 0.825" - 14 NGO | Non Flammable | Air >20,000 kPa |