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IS0
I NTERN AT10 N AL ORGAN IZATl O N FOR STANDARD I2 AT10 N
IS0 RECOMMENDATION
R 54
MODULES AND DIAMETRAL PITCHES
OF CYLINDRICAL GEARS FOR GENERAL ENGINEERING
AND FOR HEAVY ENGINEERING
2nd EDITION
April 1966
This second edition supersedes the first edition
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 ISQ.
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 Reconiiiiendatiou K 54, Ilrinihiles ciid Diriinetrd Pitches qf Cyliii&ical Gem.s for
G'eîwral E/'r.lgi~rring, was drawn up by the Technical Committee lS@/TC 6@. Gear,.)-, the Secrc-
tariat of which is heid 51, the Institut Belge de Normalisation (IBN).
iî first draft proposstl was dran.n up al the first meeting of ISO/K 6Q, held ;ri Paris, i:i
October 1950. This draft proposal was discussed by the Technical Committee in tlie two following
meetings. held in 1-ondon, in April 1952, ;ii>d in Brussels, in Deceinber 1954. Duriiig this lattcr-
meeting, an amcnded text was Linanimcruslj adopted as a Draft IS0 Recommendation.
On 16 December 1055, this Draft IS0 Kecoillmendation was circulated to all the IS0
Vleniber Bodies. Tlic cornments \ubmitted during the enquiry were examincd bv tlie Technical
Committee at its fourth meeting, held in Geneka, in September 1956, a.nd it \\as decided to make
certain editorial amendinciits to the Drd~
These amendmcnts havins been taken into ;jc~:oiint. tlie Draft IS0 Recommendation was
approved by the following 23 (out of a total of 37) Member Bodies:
"Austria Germany Roniania
Belgium "Greccc Spain
Bulgaria Hungary Sweden
Chilc lndia Switzerland
Czechoslovakia *Israel Turkey
"Denmark sltaly United Kingdom
Finland h'cthei~lai~ds U.S.S.R.
France Norway
The revised Draft IS0 Recommendation \bas then submitted by correspondence to the
IS0 Council, which decided, in Deceinber 1957, to accept it as it!? IS0 RECOMMENDATION.
* Thesc Memher Bodies stated t1i:it they had no BRIEF HISTORY
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