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UDC 621.882.11.6
IS0
I N T ER N AT I ON AL OR G A NI Z AT I O N STA N D A R D I Z AT I O N
FOR
1
IS0 REC MMENDATION
,IR 272
HEXAGON BOLTS AND NUTS
WIDTHS ACROSS FLATS, HEIGHTS OF HEADS,
THICKNESSES OF NUTS
i
i
?st EDIT1 ON
ii
/ 1
September 1962
COPYRIGHT 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 272, Hexagon Bolts and Nuts-Widths across Flats,
Heights of Heads, Thicknesses of Nuts, was drawn up by Technical Committee ISO/TC 2,
Bolts, Nuts and Accessories, the Secretariat of which is held by the Deutscher Normen-
ausschuss (DNA).
Work on this question by the Technical Committee began in 1953 and led, in 1959,
to the adoption of a Draft IS0 Recommendation.
In June 1960, this Draft IS0 Recommendation (No. 383) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Bulgaria India Portugal
Chile Israel Romania
Colombia Italy Spain
Denmark Japan Sweden
Finland Netherlands United Kingdom
Germany New Zealand U.S.S.R.
Greece Norway
Hungary
Poland
Five Member Bodies opposed the approval of the Draft: Australia, Belgium,
Czechoslovakia, France, Switzerland.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in September 1962, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 272 - 1962 (E)
IS0 Recommendation R 272 September 1962
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