The invention is characterised in that a coarse thread (3, 3') and at least one fine thread (4, 4', 5, 5'), each having the same thread pitch are configured as the external thread and the internal thread on the pipes (1, 2) that are to be connected.
The bottom portion (6c) of the portion having the projection (6) corresponding to the fine thread is so raised as to become flat at a position shallower than the bottom (5b) of the reference parallel thread.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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