TurningMillingDrillingTechnicalInformationIndex Threading System code – inserts A R T 22. 01 W – 3.50 GM (P) (B) 1 2 3 4 5 6 7 8 9 Type Insert shape Insert size [mm] Code Description Code I.C R Right 11 6,35 T Z Special L Left 16 9,252 22 12,70 1 2 3 B Teeth per cutting edge Application Pitch Code Description Code Description Code Pitch range (part profile) 01 1 W External thread A 0,5 – 1,5 mm 48 – 16 (TPI) 02 2 N Internal thread AG 0,5 – 3,0 mm 48 – 8 (TPI) G 1,75 – 3,0 mm 14 – 8 (TPI) N 3,5 – 5,0 mm 7 – 5 (TPI) Pitch range [mm] (full profile) 0,50 0,75 1,00 1,25 1,50 C 1,75 2,00 2,50 3,00 3,504,004,505,005,506,00 Pitch range (TPI) (full profile) 4 5 6 8 10 11 11,5 12 14 16 18 19 20 24 27 28 4 5 6 Thread profile D Code Description Chip breaker GM ISO metric coarse thread 60° 60 Partial profile 60° 8 55 Partial profile 55° W Whitworth UN Unified conventional thread Insert thickness [mm] BSPT Whitworth taper pipe thread Code Description NPT American taper pipe thread B Thin type NPTF Dryseal American taper pipe thread 9 R Knuckle thread 30° MJ Thread for aerospace E UNJ Unified screw thread TR Metrical ISO trapezoidal thread AC American national thread STAC STUB-ACME thread AP API 60° thread RD API round thread BUT American buttress thread 7 A 412