The error in the alignment or "twist" of the tooth along its width. Transition from Old JIS (1976)
: Measures how closely the actual tooth profile matches the ideal involute curve. jis b 1702-1 pdf
The JIS B 1702 series is divided into multiple parts to address different measurement methods and materials: Accuracy of Gears | KHK The error in the alignment or "twist" of
If you need the PDF for professional use: jis b 1702-1 pdf