Many Japanese mechanical design textbooks (translated or original) heavily reference JIS B 1702-1.
: The desired quality level (e.g., Grade 6 for automotive gearboxes). jis b 1702-1 pdf
Engineers reviewing technical blueprints often encounter a mix of old and new notations. Understanding how the standard evolved is vital when cross-referencing values inside a downloaded PDF document: Former Standard (JIS B 1702:1976) Modern Standard (JIS B 1702-1:1998 / 2016) Numeric alone (e.g., Grade 0, Grade 4) Prefixed with "N" or "IT" (e.g., Grade N5, Grade N7) Number of Grades 9 grades (0 to 8) 13 grades (0 to 12) Accuracy Scale 0 is the highest precision; 8 is the lowest 0 is the highest precision; 12 is the lowest ISO Alignment Independent Japanese metrics Fully harmonized with ISO 1328-1 Understanding how the standard evolved is vital when
standard, ensuring that gears made to these Japanese specifications are compatible with global engineering projects. The Blueprint of Accuracy JIS B 1702-1 categorizes gears into , typically ranging from Grade 0 (highest precision) Grade 12 (lowest precision) jis b 1702-1 pdf
While Part 2 deals more specifically with radial composite deviations ( Fi′′cap F sub i double prime