21. Taps for Pipe Threads ○Taper pipe thread taps (NPTF) G Class Description of products Fc (Max) Tc (Max) Tc (Min) Measurement Flank limit (deviation) Fc (Min) Flank limit (measurement) Tr (measurement) Tr (Max) Tr (Max) Fr (Max) Fr (measurement) Axis of tap Fr (Max) Taper Unit : μm Crest Root Size Max. Min. Max. Min. Max. Min. Information Technical Technical-70