Indexable Boring Tools Recommended Cutting Conditions DB Series (Boring Tools) Work Material Hardness Vc(m/min) Feed(mm/rev) Mild Steel (<180HB) 90~200 0.04~0.14 P Cabon Steel (180~280HB) 60~180 0.04~0.15 Alloy Steel (280~350HB) 50~150 0.04~0.15 M Stainless Steel (<200HB) 60~230 0.07~0.12 Cast lron (<350Mpa) 120~230 0.04~0.13 K Ductile Cast lron (<450Mpa) 120~230 0.04~0.13 Aluminum <12% Si - 120~700 0.04~0.25 N Aluminum >12% Si - 120~700 0.04~0.25 S Heat Resistant Alloy - 20~80 0.04~0.05 H Hardened Material - 20~70 0.04~0.05 B101