Selection Chart Intro MS Material Specific CT FC N-CT FC CT-PF LS-N-CT N-CT-SP N-CT-PO CT LA N-CT LA HF HF HF HF HF HF HF HF SP CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE SL PO ST ROLL DIN JIS JIS JIS JIS JIS DIN JIS M 401 409 414 417 419 403 421 MF 410 415 417 422 UNC/UNF 411 UNS, 8, 12, 20, 32UN CARBIDE UNEF G (BSP) 401 413 Rp (BSPP) Rc (BSPT) NPT LONG NPTF NPSC, NPSM, NPSF BSW EG(STI), M, MF, UNC/UNF HAND Pg TAPS TrS miniature Special threads Vc (m/min) EG (STI) P1P2 P3 P4 SPECIALTHREADS,GAUGES P5P6P7P8 M1 M2 THREAD M3 MILLS K1 H 5÷15 H 5÷15 H 5÷15 H 5÷15 K2 H 5÷15 H 5÷15 H 5÷15 H 5÷15 K3 I ≤10 I ≤10 I ≤10 I ≤10 K4 ª8 ≤8 ª8 ≤8 ª8 ≤8 ª8 ≤8 DIES N1 H 10÷20 H 10÷20 H 10÷20 H 10÷20N2H5÷15H5÷15H5÷10H5÷15H10÷20H10÷20H10÷20H10÷20 N3 N4 H 5÷15 H 5÷15 H 5÷10 H 5÷15 H 10÷20 H 10÷20 H 10÷20 H 10÷20 N5 CENTER S1 (<25 HRC) DRILLS S2 (<35 HRC) S3 (35 ÷ 45 HRC) S5 H (45 ÷ 55 HRC) Technical H (55 ÷ 63 HRC) info H 1st choice I suitable 398