- Hard Grade Materials

The following are base line End Mill Speed and Feed recommendations. Adjust your end mill speeds and feeds according to your individual circumstances. Call our technical support department for further assistance with speeds and feeds at 1-866-583-TOOL.

Feed (IPM) = RPM x CPT x # of flutes

RPM = SFM x 3.82/tool diameter

Material	SFM	1/8"	3/16"	1/4"	3/8"	1/2"	5/8"	3/4"	1"
Non-Ferrous
Aluminum Alloys	500-1000	.001	.0015	.002	.003	.004	.005	.006	.008
Copper	800-1000	.001	.0015	.002	.0025	.003	.004	.0045	.005
Copper Alloys	800-1000	.001	.0015	.002	.0025	.003	.004	.004	.005
Plastics	200-500	.001	.002	.003	.004	.006	.008	.01	.012

Material	SFM	1/8"	3/16"	1/4"	3/8"	1/2"	5/8"	3/4"	1"
Stainless Steels
Precipitation 17/4, 17/7, AF-71, Custom 450/635, 15/7	90-125	.0003	.0005	.001	.001	.002	.003	.004	.005
Austenitic 304, 310, 314, 316, 321 330, 347, 348	90-150	.0002	.0003	.0005	.001	.002	.0025	.0035	.004
Martensitic 420, 430F, 440C, 446	90-170	.0002	.0003	.0005	.001	.0015	.0025	.0025	.004
High Temp Alloys
Cobalt Base	50-80	.0003	.0004	.0006	.0008	.0012	.0015	.002	.0025
Nickel Base	50-80	.0004	.0005	.0008	.001	.002	.0025	.003	.004
Iron Base	70-110	.0004	.0005	.001	.0015	.002	.0025	.003	.004

Material	SFM	1/8"	3/16"	1/4"	3/8"	1/2"	5/8"	3/4"	1"
Steels
High Strength Steel 4140, 4340M, Armor Plate	80-140	.0004	.0006	.001	.0015	.0015	.0025	.003	.004
High Alloy Steel - Mold & Die	80-140	.0004	.0006	.001	.0015	.0015	.0025	.003	.004
Medium Alloy 200, 250, 300	80-140	.0005	.0005	.001	.002	.0025	.0035	.004	.005
Low Alloy - Maraging	100-120	.0005	.0007	.0012	.002	.003	.004	.005	.006
Cast Iron
Ductile Iron	80-140	.0005	.008	.0015	.002	.0022	.003	.004	.006
Cast Iron	80-140	.0005	.001	.002	.003	.004	.005	.006