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 2026
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Published (Edition 1, 2024)

ISO 21771-1:2024

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CHF 227
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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 to be revised [90.92]
  • Edition
     : 1
    Number of pages
     : 159
  • Technical Committee :
    ISO/TC 60/SC 1
    ICS :
    21.200 
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Next version under development

Draft
International Standard
ISO/DIS 21771-1
Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry
Reference number
ISO/DIS 21771-1
Edition 1
© ISO 2026
Draft International Standard

ISO/DIS 21771-1

Cylindrical involute gears and gear pairs

Part 1: Concepts and geometry

ISO/DIS 21771-1

Language
Format
CHF 135
* Shipping costs not included
Convert Swiss francs (CHF) to your currency

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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