Inlet / outlet connectionsThese 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