Transcription of TAPERED PIPE THREADS R, Rc & NPT PITCH DIAMETER
1 2007/ 1 tapered pipe threads r , Rc & NPT PITCH DIAMETER Ref. DS/ISO 7-1 pipe THREADS WHERE PRESSURE-TIGHT JOINTS ARE NOT MADE ON THE THREADS (WHITWORTH) & ANSI/ASME pipe THREADS , General Purpose E0 is the internal measuring point and E1 is the external measuring point R and Rc NPT Internal thread inserts FMS Type 25 External thread inserts FMS Type 24 R & Rc (WHITWORTH pipe thread ) BSPT Nominal pipe diam, P mm PITCH diam. E0 PITCH diam. E1 Measurement point L1 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4 5 6 19 19 14 14 11 11 11 11 11 11 11 11 11 FMS thread inserts type 24A and 25A can measure pitches from 19 to 8 NPT (AMERICAN pipe thread ) Nominal pipe diam.
2 P mm PITCH diam. E0 PITCH diam. E1 Measurement point L1 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 18 18 14 14 11 11 11 11 8 8 8 8 8 8 R & Rc (WHITWORTH pipe thread ) (BSPT) Nominal pipe DIAMETER P PITCH DIAMETER at 6 mm depth External Internal 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4 5 6 19 19 14 14 11 11 11 11 11 11 11 11 11 PITCH DIAMETER tolerances PITCH DIAMETER tolerances on external THREADS on internal THREADS 19 19 14 14 1) 1) 11 2) 2) 11 1)
3 Up to and including R 2 and RC 2 2) above R 2 and RC 2 NPT (AMERICAN pipe thread ) Nominal pipe DIAMETER P PITCH DIAMETER at 6 mm depth External Internal 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 18 18 14 14 11 11 11 11 8 8 8 8 8 8 PITCH DIAMETER tolerances PITCH DIAMETER tolerances on external THREADS on internal THREADS 18 18 14 14 11 11 8 8
