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Ref. NO.: ISO/R 221 - 1961 (E)
IS0
1 N T E RN AT I O N A L ORGAN I Z AT I ON FOR STA N DARD IZ AT1 O N
IS0 RECOMMENDATION
R 221
STEEL TUBES
THICKNESSES
1st EDITION
December 1961
COPY RIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 221, Steel Tubes. Thicknesses, was drawn up by Technical
Committee ISO/TC 5, Pipes and Fittings, the Secretariat of which is held by the Association Suisse
de Normalisation (SNV).
Work on this question by the Technical Committee began in 1954 and led, in 1958, to the
adoption of a Draft IS0 Recommendation.
This first Draft IS0 Recommendation (NO 329) was submitted to all the IS0 Member
Bodies for enquiry; during the consultation on this Draft, the proposal was made to introduce
additional thicknesses. The Technical Committee therefore presented a second Draft IS0 Recom-
mendation, which was circulated to all the IS0 Member Bodies in August 1960, and which was
approved, subject to certain modifications, by the following Member Bodies :
Austral
...