Selection Chart Intro GP General Purpose MS Material Specific SP STI PO STI HT STI N-RS STI AL-SP STI AL-PO STI AL-HT STI ZELX NI SP STI HSS-E NI HSS-E HSS-E HSS-E NI HSS-E NI HSS-E HSS-E HSS-P NX SP SL PO ST ROLL ANSI ANSI ANSI JIS JIS JIS JIS ANSI M MF UNC/UNF UNS, 8, 12, 20, 32UN CARBIDE UNEF G (BSP) Rp (BSPP) Rc (BSPT) NPT LONG NPTF NPSC, NPSM, NPSF BSW EG(STI), M, MF, UNC/UNF 531 535 539 529 521 523 525 532 HAND Pg TAPS TrS miniature Special threads Vc (m/min) EG (STI) P1 I 5÷10 I 5÷10 I 5÷10P2I5÷10I5÷10I5÷10 I 5÷15I5÷15 P3 I 5÷10 I 5÷10 I 5÷10 H 5÷15 P4 H 5÷15 SPECIALTHREADS,GAUGES P5P6P7P8 I 5÷10H5÷15H4÷8 M1 H 5÷15 M2 H 5÷15 THREAD M3 H 4÷8 MILLS K1 K2 K3 K4 DIES N1 H 5÷15 H 5÷15 H 5÷15 H 5÷15 H 10÷25 H 5÷15 H 5÷15N2H5÷15H5÷15H5÷15H5÷15H10÷25H5÷15H5÷15 N3 H 5÷15 H 5÷15 H 5÷10 H 5÷15 H 10÷25 H 5÷15 I 5÷10 N4 H 5÷15 H 5÷15 H 5÷10 H 10÷25 H 5÷15 H 5÷10 N5 CENTER S1 (<25 HRC) H 5÷10 DRILLS S2 (<35 HRC) H 5÷10 S3 (35 ÷ 45 HRC) S5 H (45 ÷ 55 HRC) Technical H (55 ÷ 63 HRC) info H 1st choice I suitable 518