Applies to individual spur and helical gears (not gear pairs).
If you are looking for the official document, you can find the current 2016 version through the Japanese Standards Association (JSA) Webdesk . What is JIS B 1702-1?
To distinguish from the older JIS B 1702:1976 standard, these newer grades are often prefixed with an "N" (e.g., N5 ). Key Accuracy Parameters jis b 1702-1 pdf
The standard measures several specific types of errors to determine a gear's grade: Jis B 1702-1 | PDF - Scribd
The standard is a critical Japanese Industrial Standard that defines the accuracy and tolerance classification for cylindrical involute gears. Established to align Japanese manufacturing with international benchmarks, it is essentially the Japanese equivalent of the ISO 1328-1 standard. Applies to individual spur and helical gears (not
The standard utilizes a system of 13 grades , numbered from 0 to 12 .
The lowest precision, often sufficient for simple agricultural or manual machinery. To distinguish from the older JIS B 1702:1976
The highest precision, typically used for aerospace or high-end metrology.