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 CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE CARBIDE SP 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 Pg HAND Tr TAPS S miniature Special threads Vc (m/min) P1 EG (STI) P2 P3 P4 P5 SPECIAL P6 THREADS, P7 GAUGES P8 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 N1 H 10÷20 H 10÷20 H 10÷20 H 10÷20 DIES N2 H 5÷15 H 5÷15 H 5÷10 H 5÷15 H 10÷20 H 10÷20 H 10÷20 H 10÷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) S2 (<35 HRC) DRILLS S3 (35 ÷ 45 HRC) S5 H (45 ÷ 55 HRC) Technical H (55 ÷ 63 HRC) info H 1st choice I suitable 398