A p plicab l e t o o l f o r e a ch extern al th read typ e Applicable tool for each external thread General purpose General purpose Pipe type Partial-profile Full profile Parallel pipe Taper pipe Thread type 60° 55° ISO metric Unified Whitworth thread thread UNC, UNF BSW, BSF G - - M R, PT, BSPT UNEF W BSP, PF 1/8P 1/8P Thread form 60° 55° 55° 60° 60° 55° 1°47 Tool type 1/4P 1/4P ST type 0.5 ~ 3 mm 0.5 ~ 3 mm 48 ~ 8TPI 48 ~ 8TPI 0.35 ~ 3 mm 32 ~ 8TPI 28 ~ 8TPI 28 ~ 11TPI 5-20 5-7 5-10 5-8 5-11 5-13 5-14 STCR/L-18 0.4 ~ 3 mm - 0.5 ~ 1.5 mm - - - 64 ~ 8TPI 5-15 5-4 5-4 JS-STCL18 0.4 ~ 3 mm 64 ~ 8TPI - - - - - 5-17 5-4 JSXXR/L 0.2 ~ 1.5 mm 127 ~ 16TPI - - - - - 5-17 5-5 JS-SXXL09 0.2 ~ 1.5 mm 127 ~ 16TPI - - - - - 5-18 5-5 JSTTR/L 0.5 ~ 1 mm 0.5 ~ 1 mm 48 ~ 25TPI 48 ~ 25TPI - - - - 5-19 5-5 5-10 JS-T TL3 0.5 ~ 1 mm 0.5 ~ 1 mm 48 ~ 25TPI 48 ~ 25TPI - - - - 5-19 5-5 5-10 JSXBR/L 0.5 ~ 1 mm 48 ~ 25TPI - - - - - 5-20 5-6 ST type 0.5 ~ 3 mm 0.5 ~ 5 mm 48 ~ 8TPI 48 ~ 8TPI 0.5 ~ 3 mm 32 ~ 8TPI 28 ~ 8TPI 19 ~ 11TPI 5-23 5-7 5-10 5-8 5-11 5-13 5-14 0.5 ~ 1.5 mm 48 ~ 16TPI - - - - - 5-24 5-24 5-2