TOOL STEELS D,S,M,O,H,P Series Hi Pressure Rc SFM 17-22 250 22-27 200 27-32 150 32-37 100   ALLOY STEELS 4000, 5000, 8000 Series   Rc SFM 17-22 300 22-27 250 27-32 200 32-37 150 37-42 100   Low to Med. CARBON STEEL C1010-1550 Rc SFM 12-17 400 17-22 350 22-27 300 27-32 250 32-37 200 37-42 150   STAINLESS STEEL* 300 Series 300 Series & PH Rc SFM 12-17 230 17-22 200 22-27 170 27-32 140 32-37 110 37-42 80 Free Machining + 30%   STAINLESS STEEL *  400 Series 400 Series Rc SFM 12-17 280 17-22 240 22-27 200 27-32 160 32-37 120 37-42 80 Free Machining + 30%   CAST IRON Grey Rc SFM 12-17 400 17-22 350 22-27 300 27-32 250 With Free Carbides -50% Ni-Resist -60%   CAST IRON Ductile, Nodular Rc SFM 12-17 300 17-22 250 22-27 200 27-32 150 32-37 100 Ductile, Ni-Resist -50%   TITANIUM* 6A1 4V, Some Others Rc SFM 12-17 260 17-22 220 22-27 180 27-32 140 32-37 100 37-42 60   HIGH TEMP. ALLOYS* Nickel Based   Rc SFM 12-22 120 22-32 90 32-42 60 Cobalt Base -40% Iron Base +20%   COPPER ALLOYS* Berryllium, Ni-Based   Rc SFM 12-22 200 22-32 130 32-37 60   SOFT ALLOYS Non Ferrous Aluminum, Copper, Free Brass, Magnesium 500 - 600 SFM All Conditions   Consult Sterling Gun Drills to verify application requirements. High SFM will cause vibration and/or harmonics with long gun drills. Reduce RPM or ensure adequate supports are in place or use an intermediate length gun drill. Minimum oil/coolant pressure is 35% of the PSI values on page 2. If at minimum, reduce SFM by 35%. Applications suitable for our Spraymist System, reduce SFM by 35% at same feed rate listed. Water soluble coolant must be oil based, high “EP” at 10-12% concentration, NO SYNTHETICS!