EN ISO 228-1:2003

Foreword
1 Scope
2 Normative reference
3 Symbols
4 Dimensions
5 Designation
6 Combination with jointing thread
Annex A (informative) References to European standards
Bibliography

This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation forfastening 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 assemblieswith such threads must be made pressure-tight, this should be effected by compressing two tightening surfacesoutside 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 recommendedgauging systems.