21. Taps for Pipe Threads Unit : m Description of products Crest Root Size Tc Fc Tr Fr 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) Tr (measurement) Tr (Max) Max: Major Dia. Min: Major Dia. Max: Pitch Dia. Min: Pitch Dia. Fr (Max) Max: Minor Dia. Fr (measurement) Fr (Max) Unit : mm Size Major diameter Pitch diameter Minor diameter Max. Min. Tolerance Max . Min. Tolerance Max. Fr (Max) Tr (Max) : Above dimensions change depending on actually measured. Information Technical Technical-62 833