La présente norme spécifie la désignation, les dimensions et les tolérances des filetages gaz pour raccordement sans étanchéité dans le filet.Ces filetages cylindriques extérieur et intérieur s'appliquent aux assemblages mécaniques des pièces de raccords de robinetterie, d'accessoires, etc Leur vérification fait l'objet des normes NF E 03-161, NF 03-162, NF 03-163 et NF 03-164., Les filetages gaz avec étanchéité dans le filet font l'objet de la NF E 03-004.
This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads, intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc. These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies with such threads must be made pressure-tight, this should be effected by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal. NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see ISO 7-1. NOTE 2 ISO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recommended gauging systems.
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