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ISO/CD 21771-1

Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry

General information

30.99     Jun 24, 2025

ISO

ISO/TC 60/SC 1

International Standard

Scope

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.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 21771-1:2024

NOW

IN_DEVELOPMENT
ISO/CD 21771-1
30.99 CD approved for registration as DIS
Jun 24, 2025