EN ISO 228-1:2003

Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 228-1:2003

Publication date:   Sep 12, 2003

General information

90.93 Standard confirmed   May 18, 2009


CEN/TC 459/SC 10 Steel tubes, and iron and steel fittings

European Norm

21.040.30   Special screw threads



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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.

Related legislation

Legislation related to this standard


Pressure equipment


Construction products


Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec

Life cycle


EN ISO 228-1:2003
90.93 Standard confirmed
May 18, 2009


Adopted from ISO 228-1:2000 IDENTICAL