Gas cylinder valve thread DIN 477

The gas cylinder valve threads are a collection of threads of different types and sizes. When handling gas, it is particularly important that no mix-ups occur and incompatible gases are interchanged. For this reason, specific valve outlet connections are assigned to certain types of gas so that only the intended gas can be connected. This prevents amateurs in particular from unintentionally creating flammable or explosive combinations. But even in the professional sector, gas cylinder valve threads are a key safety mechanism that can prevent serious accidents. This is why it is not permitted in Germany to use adapters when connecting gas cylinders, as these cancel out the protective function of incompatible gas cylinder valve threads. All gas cylinder valve threads are summarized in the DIN 477 standard.

Gas cylinder valve threads can be assigned to different thread types. The tapered or cylindrical Whitworth thread W is frequently used, but also the cylindrical pipe thread G or the metric thread M.

In the thread table for gas cylinder valve threads in accordance with DIN 477, each gas type is clearly assigned a thread type and size as well as an orientation (left-hand or right-hand thread). Left-hand threads are frequently used for gas types such as propane, which are often used by non-professionals and must therefore be particularly clearly secured.

On the far left of the table you will find the connection number, which is specified by the DIN 477 standard. This is followed by the gas types for which this connection is used. This can be just a single type of gas or a whole group of gases with similar properties. This is followed by the thread identification, which provides information about the exact gas cylinder valve thread. You can of course also find taps and dies for gas cylinder valve threads in our BAER Online-Shop if you follow the links in the table.