National pipe thread
- National pipe thread
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Le National Pipe tapered Thread, abrégé en NPT, est une norme américaine pour les raccords hydrauliques. Il désigne la forme du filetage et la façon dont l'étanchéité est faite. Dans le cas du NPT, elle est assurée par un contact arête sur cône (filetage conique, tapered thread).
Les tailles les plus couramment utilisés sont ⅛, ¼, ⅜, ½, ¾, 1, 1¼, 1½, et 2 pouces. Elles sont définies par les standards ANSI et ASME standard B1.20.1[1]
Ce type de raccord est notamment utilisé pour les brides à visser, en anglais : screwed flange.
Voir aussi
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Un raccord NPT
