International Standard
ISO 21771:2007
Gears — Cylindrical involute gears and gear pairs — Concepts and geometry
Reference number
ISO 21771:2007
Edition 1
International Standard
Read sample
ISO 21771:2007
Published (Edition 1, 2007)
This standard was last reviewed and confirmed in 2022. Therefore this version remains current.

ISO 21771:2007

ISO 21771:2007
CHF 216
Convert Swiss francs (CHF) to your currency


ISO 21771:2007 specifies the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. Flank modifications are included. It also covers the concepts and parameters for cylindrical gear pairs with parallel axes and a constant gear ratio, which consist of cylindrical gears according to it. Gear and mating gear in these gear pairs have the same basic rack tooth profile.

General information

  •  : Published
     : 2007-09
    : International Standard to be revised [90.92]
  •  : 1
     : 83
  • ISO/TC 60/SC 1
  • RSS updates

Life cycle

Got a question?

Check out our Help and Support