International Standard
ISO 21771-1:2024
Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry
Reference number
ISO 21771-1:2024
Edition 1
2024-10
© ISO 2025
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Published (Edition 1, 2024)

ISO 21771-1:2024

Language
Format
CHF 221
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Abstract

This document specifies the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. Flank modifications are included. The formulae in this document apply to all pressure angles.

It also covers the concepts and parameters for involute cylindrical gear pairs with parallel or crossed axes, and a constant gear ratio. Gear and mating gear in these gear pairs have the same basic rack tooth profile.

General information

  • Status
     : Published
    Publication date
     : 2024-10
    Stage
    : International Standard published [60.60]
  • Edition
     : 1
    Number of pages
     : 159
  • Technical Committee :
    ISO/TC 60/SC 1
    ICS :
    21.200 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goals

4
Quality Education
9
Industry, Innovation and Infrastructure

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