DS/ISO 1328-1:2013

Cylindrical gears - ISO system of flank tolerance classification - Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth

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This part of ISO 1328 establishes a tolerance classification system relevant to measurements on tooth flanks
of individual cylindrical involute gears. It specifies definitions for gear flank tolerance terms, the structure of
the flank tolerance class system, and allowable values.
It is strongly recommended that any user of this part of ISO 1328 be very familiar with the methods and
procedures outlined in ISO/TR 10064-1. Use of techniques other than those of ISO/TR 10064-1 combined
with the limits described in this part of ISO 1328 may not be suitable.
This standard provides the gear manufacturer and the gear buyer with a mutually advantageous reference for
uniform tolerances. Ten flank tolerance classes are defined in this standard, numbered 2 through 11, in order
of decreasing precision. Equations for tolerances and their ranges of validity are provided in 5.3 for the
defined accuracy of gearing. In general, these tolerances are applicable to the following ranges:
5 . z . 1000 or 15 000 / mn whichever is less
5 mm . d . 15 000 mm
0.5 mm . mn . 70 mm
4 mm . b . 1200 mm
ƒÀ . 45‹
d is reference diameter;
mn is normal module;
b is facewidth (axial);
z is number of teeth;
ƒÀ is helix angle.
See clause 4 for required and optional measuring methods.
This standard does not apply to enclosed gear unit assemblies, including speed reducers or increasers, gear
motors, shaft mounted reducers, high speed units, or other enclosed gear units which are manufactured for a
given power, speed, ratio or application.
Gear design is beyond the scope of this standard. The use of the flank tolerance classes for the
determination of gear performance requires extensive experience with specific applications. Therefore, the
users of this standard are cautioned against the direct application of tolerance values to a projected
performance of unassembled (loose) gears when they are assembled. Refer to the latest ISO Publications
Index for applicable standards.
Surface texture is not considered in this standard. For additional information on surface texture, see ISO/TR

Number of pages: 64

Published: 2013-09-13

Date of approval: 2013-09-03

International relationships : ISO 1328-1:2013 IDT

ICS: 21.200 - Gears

Item number: M269239



  • ISO/TC 60/WG 2

Danish committee