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Inlet / outlet connections These tables identify the most typical cylinder outlet connections used with the main Specialty Gases pure gases and mixtures.

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**

* Working pressure above 250 bar in Europe and 182 bar in USA 
** 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



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