Technical Description of productsInformation Tr (measurement) Tr (Max) Max: Major Dia. Min: Major Dia. Max: Pitch Dia. Min: Pitch Dia. Max: Minor Dia. 21. Taps for Pipe Threads Unit : μm Crest Root Size Max. Min. Max. Min. Max. Min. Max. Min. ■Thread limit of Dryseal American Pipe Thread Taps ○Straight pipe thread taps (NPSF) G Class Measurement Flank limit (deviation) Flank limit (measurement) Fr (Max) Fr (measurement) Fr (Max) Unit : mm Major diameter Pitch diameter Minor diameter※ Size Max. Min. Tolerance Max . Min. Tolerance Max. Fr (Max) Tr (Max) ※ : Above dimensions change depending on actually measured. Technical-69