Thread type: W Cylindrical - gas cylinder valve thread DIN 477

Gas cylinders are according to the standard EN 962 transportable gas cylinders, valve protection caps and valve guards for industrial and medical use.
Depending on the type of gas there are different screwed connections to avoid confusion. The use of adapters is expressly forbidden in Germany.

Connection 
No.
Approved Gas TypesThread
1Arsine, 1,3-butadiene, butane, 1-butene, chloroethene, chloromethane, deuterium, difluoromethane (R32), dimethyl ether, 2,2-dimethylpropane, ethane, ethene, ethylene, isobutane, isobutylene, methane, hydrogen phosphide (Phoshin) propane, propene, silicon hydride (silane), hydrogenW 21,80 x 1/14"
left
2Butane, isobutane, propane (up to 33 liter volume)W 21,80 x 1/14"
left
3AcetyleneClamping bracket
5Dichlorosilane, carbon monoxide, hydrogen sulfideW 1"
left
6Ammonia, argon, chlorodifluoromethane (R22) helium, carbon dioxide, krypton, neon, octafluorocyclobutane (R C318), octafluoropropane (R 218), sulfur hexafluoride, carbon tetrafluoride (R14) Tifluormethan (R23) XenonW 21,80 x 1/14"
right
7Ssulfur dioxideG 5/8"
8Boron trichloride, boron trifluoride, hydrogen bromide, chlorine, hydrogen chloride, hydrogen fluoride, nitrogen dioxide, nitric oxide, nitrogen trifluorideW 1"
right
9Oxygen calibration gas (oxygen) 21%)G 3/4"
right
10NitrogenW 24,32 x 1/14
right
11Nitrous oxide (normal connection)G 3/8"
right
12Nitrous oxide (up to 3 liters of volume)G 3/4"
right, internal
14Test gas (oxygen <21%)M 19 x 1,5
left
52Non-flammable and non-toxic gases filling pressure 300 barM 30 x 1,5
right, internal
54non-flammable, non-toxic and non-oxidizing gases and gas mixturesW 30 x 2 (15,9 / 20,1)
right
55Non-flammable, toxic and corrosive gases and gas mixturesW 30 x 2 (15,2 / 20,8)
right
56Compressed airW 30 x 2 (16,6 / 19,4)
right
57Flammable, non-toxic gases and gas mixturesW 30 x 2 (15,2 / 20,8)
left
58Flammable, toxic and corrosive or non-corrosive gases and gas mixturesW 30 x 2 (15,9 / 20,1)
left
59Oxygen and oxidizing, non-toxic, non-corrosive gases and gas mixturesW 30 x 2 (17,3 / 18,7)
right
60Oxidizing, toxic and / or corrosive gases and gas mixturesW 30 x 2 (18 / 18)
right
0170Argon, helium, nitrogen, charge pressure> 200 to 300 barW 30 x 2
right
Gas cylinder valve protection capW 80 x 1/11"
right
Cross section of cylindrical gas cylinder valve thread