Home Page

19.5 Metric Gear Standards

With recent increasing presence of metric geanng in the USA it is important that designers and gear users have knowledge of and ready reference to various metric gear standards used throughout the world.

19.5.1 USA Metric Gear Standards — Metric gears designed and produced in the USA should conform to the ISO standard. This is the latest metric standard based upon SI units which have been
decreed as the most precise metric measurement for standardized international use.
The latest (1989) ISO gear standards are listed in Table 1.36. They can be procured from ANSI. 1430 Broadway, New York, N.Y. 10018

19.5.2 ForeIgn Metric Gear Standards — Several of the major industrialized countries that have been dedicated for a long time to metric measurement countries have developed their own standards for metric gearing. In general they have similar standards, and since the establishment of ISO and SI units have adopted these standards as theirs.
With increasing international trade and worldwide manufacture of common products, availability and familiarity with appropriate foreign standards have become important. To serve that need Table 1.37 offered as a listing of key gear standards in use in several major countries and geographic areas.