Technical Information Grade Selection Chart Suggested Grades and Speeds for Threading Various Workpiece Materials recommended surface speed — SFM workpiece group workpiece material uncoated PVD coated THM TN6010 TN6025 free-machiningcarbon steel 10L18, 10L45, 1213, 12L13,12L14, 1140, 1141, 11L44,1151, 10L50— 91–98 45–198 10063, 1008, 1010, 1015, plain carbon steel 1018, 1020, 1025, 1026, — 76–198 45–175 1108, 1117 alloy steels/tool steels 150–325 HB(up to 35 HRC) 1042, 1045, 1070, 1080, 1085,1090, 1095, 1541, 1561, 1572,— 76–198 38–167 alloy steels/tool steels330–450 HB5140, 8620, W1, O1, S1, P20,H13, D2, A6, H13, L6 — 61–160 — (36–47 HRC) martensitic/ferriticstainless/precipitationhardening416, 420F, 440F, 405, 409, 429,430, 434, 436, 442, PH— 45–160 30–120 201, 202, 301, 302, 303, 304, austenitic stainless steel 304, 305, 321, 347, 348, 310, 61–106 61–198 46–137 314, 316, 316L, 330 grey cast iron135–270 HB class 20, 30, 35, 45 61–91 61–237 46–122 grey cast iron275–450 HB class 50, 55, 60 45–76 45–175 15–76 alloy/ductile iron A536, J434C, 60-40-18,80-55-06, 100-70-03 45–76 45–650 100–525 free-machiningaluminium alloys 2024-T4, 2014-T6, 6061-T62011-T3, 3003-H18, A2, Alcan,Alcoa 510, Duralumin122—244122—265 — high-silicon A380, A390, A380-1,aluminium alloysA390-1, A380-2 — — — copper/zinc/brass 76–183 76–304 46–236 non-metallics Graphite, Nylon, Plastics,Rubbers, Phenolics, Carbon122–457 122–396 46–305 high-temperature alloys125–269 HB(up to 27 HRC)Nickel 200, Monel, R405,Monel K500, INCONEL 600,INCONEL® 625/901x750/718,Waspaloy, Hastelloy C24–3724–12213–76 high-temperature alloys Rene 95, Waspaloy A286, 260–450 HB Incoloy 800, Haynes 188, 24–30 30–76 6—61 (26–47 HRC) Stellite F, Haynes 25 titanium alloys Ti-6AI-4V, TI-5AI-2.5Sn 34–55 34–99 — NOTE: When workpiece hardness levels are at the top of a range, starting m/min Edge preparation: should be at the lower end. Regularly inspect insert clamps for worn flats. Uncoated — sharp PVD coated — light hone except positive top rake, top rake-sharp widia.com F81