Machinability Rating Chart

MACHINABILITY RATING CHART
This chart is for general reference as a starting point only. Higher machinability rating numbers mean the material is softer or easier to machine. Surface feet per minute values correspond to the hardness range for each material. At the harder end of the scale (or lower machinability rating value) use the lower SFM value. Brinell hardness can be converted to another scale using our conversion chart.
MATERIAL		Hardness in Brinell	Machinability Rating	SFM High Speed Steel	SFM Carbide
Alloy Steels, Cast	Material Grade	Range	Range
Low Carbon	1320, 2315, 2320	150-300	.52 - .32	80 - 40	380 - 250
	4110, 4120, 4320,
	8020, 8620

Medium Carbon	1330, 1340, 2325,	175-400	.36 - .16	60 - 20	300 - 100
	2330, 4125, 4130,
	4140, 4330, 4340,
	8030, 80B30, 8040
	8430, 8440, 8630,
	8640, 9525, 9530,
	9535

Alloy Steels, Wrought
Low Carbon	4012, 4024, 4028,	125-425	.56 - .24	80 - 30	380 - 250
	4320, 4427, 4617,
	4621, 4718, 4817,
	5015, 5120, 8115,
	8620, 8625, 8720,
	9310

Medium Carbon	1330, 4032, 4130,	175-52RC	.36 - .08	60 - 10	300 - 40
	4135, 4140, 4145,
	4150, 4340, 5130,
	5140, 5147, 5150,
	6150, 8630, 8637,
	8640, 8642, 9255,
	9260

High Carbon	50100, 51100,
High Carbon	52100, M-50

Free Machining Alloy Steels, Wrought
Medium Carbon, Resulfurized	4140, 4150	150-425	.52 - .32	80 - 40	380 - 250

Medium & High Carbon Leaded	41L30, 41L40,	150-425	.60 - .36	90 - 40	650 - 250
	41L47, 41L50,
	43L47, 51L32,
	52L100, 86L20,
	86L40

Armor Plate, Wrought
	MIL-S-12560	250-300	0.28	45 - 30	300 - 250

Aluminum Alloys, Cast		40-100	4.80	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER
Sand and Permanent Mold	X201.0, 213.0, 242.0,	40-125 (500 kg)	4.80 - 3.20	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER
	8295.0, 319.0, F332.0,
	355.0, 356.0, 357.0,
	514.0, 520.0, A712.0,
	713.0, 850.0

Die Castings	360.0, A360.0, A380.0,	40-125 (500 kg)	.32 - .24	60 - 30	300 - 250
	384.0, 392.0, A413.0,
	443.0

Aluminum Alloys, Wrought		30-150 (500 kg)	4.80 - 3.20	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER
	EC, 1060, 1145,
	1235, 2014, 2018,
	2024, 2217, 2218,
	2618, 3004, 4032,
	5050, 5056, 5086,
	5252, 5454, 5457,
	5657, 6061, 6066,
	6101, 6262, 6951,
	7004, 7039, 7075, 7175

Carbon Steels, Cast		100-300	.64 - .40	100 - 50	460 - 275
Low & Medium Carbon	1010, 1020, 1030,
	1040, 1050

Carbon Steels, Wrought		85-275	.80 - .44	130 - 55	700 - 310
Low Carbon	1005, 1009, 1011,
	1012, 1016, 1018,
	1019, 1022,1025,
	1026, 1518

Medium Carbon	1030, 1035, 1038,	125-425	.60 - .28	90 - 30	650 - 250
	1040, 1043, 1045,
	1049, 1053, 1524,
	1526, 1536

High Carbon	1060, 1065, 1070,	175-375	.44 - .28	70 - 30	420 - 250
	1075, 1080, 1085,
	1090, 1547,1551,
	1561, 1572

Free Machining Carbon Steels, Wrought		100-150	.80 - 1.00	180 - 100	800 - 350
Low Carbon Resulferized	1212, 1108, 1213, 1116,
	1118, 1211, B-1112

Medium Carbon Resulferized	1132, 1140, 1141, 1151	175-425	.72 - .28	110 - 30	600 - 250

Low Carbon Leaded	12L13, 12L14	100-250	1.12 - 1.08	190 - 120	800 - 350

Ductile Cast Irons
Ferritic	60-40-18, 65-45-12	140-190	1.00	180 - 120	800 - 350

Ferritic-Pearlitic	80-55-06	190-260	.64 - .52	100 - 65	460 - 300

Pearlitic-Martensitic	100-70-03	240-300	0.40	65 - 50	375 - 275

Martensitic	120-90-02	270-400	.28 - .20	60 - 25	300 - 160

Austenitic (NI-RESIST Ductile)	ASTM A439: Types D-2,	120-200	0.24	45 - 30	300 - 250
	D-2C, D-5, D-3A, D-5B
	ASTM A571: Type D-2M

	ASTM A439: Types	140-275	0.16	30 - 20	175 - 100
	D-28, D-3, D-4	140-275	0.16	30 - 20	175 - 100

Gray Cast Irons
Ferritic	ASTM A48: Class 20	120-150	1.20	190 - 120	500 - 300
	SAE G1800	120-150	1.20	190 - 120	500 - 300

Pearlitic-Ferritic	ASTM A48: Class 25	160-200	0.88	130 - 100	400 - 330
	SAE G2500	160-200	0.88	130 - 100	400 - 330

Pearlitic	ASTM A48: Classes 30,	190-220	0.64	100 - 80	460 - 330
	35 & 40
	SAE G3000

Pearlitic & Free Carbides	ASTM A48: Classes	220-260	0.60	90 - 75	650 - 330
	45 & 50
	SAE G3500, G4000

Pearlitic or Acicular & Free Carbides	ASTM A48: Classes 55,	250-320	0.32	60 - 40	300 - 250
	60 & 65+	250-320	0.32	60 - 40	300 - 250

Austenitic (NI-RESIST)	ASTM A436: Types 1,	100-250	.52 - .32	80 - 40	380 - 250
	1b, 5
	ASTM A436: Types 2,
	3, 6

Malleable Cast Irons
Ferritic	32510, 35018	110-160	1.20	190 - 120	500 - 300

Pearlitic	40010, 43010, 45006,	160-240	.88 - .64	130 - 80	400 - 330
	45008, 48005, 50005	160-240	.88 - .64	130 - 80	400 - 330

Martensitic	53004, 70003, 60004,	200-320	.60 - .28	90 - 30	650 - 250
	70002, 70004, 80002,
	90001

Copper Alloys, Cast
	834, 838, 844, 854,	40-150 (500 kg)	1.6	400 - 180	1000 - 500
	857, 864, 867, 928,
	934, 937,939, 944,
	957, 973, 976

	817, 853, 872, 876,	40-175 (500 kg)	1.4	210 - 140	500 - 400
	905, 923, 926, 947,
	952, 958

	801, 807, 815, 822,	40-200 (500 kg)	0.68	110 - 80	600 - 330
	826, 863, 907, 910,
	913, 916, 963

Copper Alloys, Wrought
	314, 330, 353, 360,	10RB - 100RB	1.60 - 2.00	400 - 180	1000 - 500
	367, 368, 377, 485	10RB - 100RB	1.60 - 2.00	400 - 180	1000 - 500

	226, 230, 268, 280,	10RB - 100RB	1.40 - 1.60	400 - 140	1000 - 400
	464, 465, 467, 675,
	770

	102, 113, 115, 116,	10RB - 100RB	.68 - .80	130 - 80	700 - 330
	170, 175, 505, 524,
	706, 745, 754

High Strength Steels, Wrought
	300M, 4330V, 4340,	225-400 43RC - 52RC
	D6ac(?), H11, H13	225-400 43RC - 52RC

		325-375 43RC - 48RC
		325-375 43RC - 48RC

		325-375
		325-375

High Temperature Alloys
Nickle Base, Wrought	Inconel Alloy 625,	200-400	.16 - .12	30 - 15	175 - 90
	702, 706, 718, 721, 722,
	X-750, 751, & 901
	M252
	Nimonic 75 & 80
	Waspoloy (?)

	Astroloy, Inconel Alloy 700	225-400	.12 - .09	20 - 10	130 - 40
	Nimonic 90 & 95, Rene 41
	Udimet 500, 700, 710

	Hastelloy B, C, G, X	140-310	.16 - .12	30 - 15	175 - 90
	Incoloy 804, 825
	Inconel Alloy 600, 604
	Refractaloy 26
	Udimet 630

	TD-Nickle	180-200	.48	80 - 55	380 - 310

Nickle Base, Cast	Hastelloy B & C ASTM A296	200-375	0.12	20 - 15	130 - 90

Cobalt Base, Wrought	Haynes Alloy 25, 188 J-1570	180-320	.16 - .08	30 - 10	175 - 40
	MAR-M905, MAR-M918
	S-816

Iron Base, Wrought	A-286, Discoloy	180-320	.28 - .20	60 - 25	300 - 160
	Incoloy 800, 801, 802
	N-155

Manganese, Wrought
		140-220	0.28	60 - 30	300 - 250

Magnesium Alloys, Cast
	AM100A, AZ81A, AZ918,	40-90 (500kg)	4.80	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER
	AZ91C, EZ33A, HZ32A,
	K1A, ZE41A, ZK51A

Magnesium Alloys, Wrought
	AZ21X1, AZ31C, AZ80A,	40-90 (500kg)	4.80	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER
	HM21A, LA141A, ZK60A	40-90 (500kg)	4.80	400 - 200 OR HIGHER	2500 - 1000 OR HIGHER

Maraging Steels, Wrought
	120 Grade	275-325	0.36	60 - 40	300 - 250
	180 Grade	375-425	0.28	60 - 30	300 - 250
	200 Grade, 250 Grade	275-325 50RC-52RC	.32 - .12	60 - 15	300 - 90
	300 Grade, 350 Grade	275-325 50RC-52RC	.32 - .12	60 - 15	300 - 90

Nickel Alloys, Wrought & Cast
	Nickel 200, 201, 205, 211,	80-170	0.56	90 - 65	650 - 300
	220, 230, & 270	80-170	0.56	90 - 65	650 - 300

	Monel 400, 401, 404,	115-240	0.44	70 - 55	420 - 310
	and R-405
	ASTM A296: Grades CZ-100
	M-35

	Duranickel 301	150-360	.16 - .12	30 - 15	175 - 90
	Monel 502 & K-500
	Ni-Span-C 902
	Permanickel 300

Nitriding Steels, Wrought
	Nitralloy 125, 135, 225, 230	200-350	.52 - .40	80 - 50	380 - 275
	EZ & N. Nitrex 1	200-350	.52 - .40	80 - 50	380 - 275

Refractory Alloys, Cast, Wrought, P/M
Molybdenum	MO, TZC, Mo-50Re, TZM	220-290	0.80	130 - 100	700 - 350

Stainless Steels, Cast
Ferritic	ASTM A217: Grades C5, C12	135-185	0.60	90 - 75	650 - 330
	ASTM A296: Grades CB-30,
	CC-50, CE-30

Austenitic	ASTM A296: Grades CF-16F,	140-170	0.64	100 - 80	460 - 330
	CN-7M	140-170	0.64	100 - 80	460 - 330
	ASTM A296: Grades CF-3,	135-185	0.56	90 - 65	650 - 300
	CF-8, CF8C, CF-20	135-185	0.56	90 - 65	650 - 300
	ASTM A451: Grades CPF8,
	CPF8C, CPF8C (Ta-Max)
	ASTM A296: Grades CF-3M,	135-185	0.56	90 - 65	650 - 300
	CF-8M, CG-8M, CG-12,
	CH20, CK20
	ASTM A-451: Grades CPF8M,
	CPF10MC, CPH8, CPH10,
	CPH20, CPK20
	ASTM A297: Grades HD, HE,	160-210	0.28	60 - 30	300 - 250
	HF, HH, HI, HK, HL, HN,
	HT, HU

Martensitic	ASTM A296: Grades CA-15,	135-225	.48 - .40	80 - 50	380 - 275
	CA-40
	ASTM A426: Grades CP7,
	CP9
	ASTM A296: Grades CA-15,	275-425	.24 - .16	45 - 20	300 - 100
	CA-40
	ASTM A426: Grades CP7,
	CP9

Stainless Steels, Wrought
Ferritic	405, 430, 436, 446,	135-185	0.68	110 - 80	600 - 330
	409, 434, 442, 502	135-185	0.68	110 - 80	600 - 330

Austenitic	201, 302, 304, 304L,	135-275	.64 - .44	100 - 55	460 - 310
	321, 347	135-275	.64 - .44	100 - 55	460 - 310
	310, 310S, 314, 316,	135-185	0.36	60 - 40	300 - 250
	316L, 317, 330	135-185	0.36	60 - 40	300 - 250

Martensitic	403, 410, 420	135-275	.56 - .36	90 - 40	650 - 275
	414	135-275	.56 - .36	90 - 40	650 - 275

Free Machinings Stainless Steels, Wrought
Ferritic	430F, 430F Se	135-185	0.96	180 - 100	800 - 330

Austenitic	230EZ, 303, 303Se, 303MA,	135-275	.76 - .48	130 - 55	700 - 310
	303Pb, 303Cu, 303 Plus X	135-275	.76 - .48	130 - 55	700 - 310

Martensitic	416, 416Se, 416 Plus X, 420F,	135-425	.88 - .24	130 - 30	400 - 250
	420F Se, 440F, 440F Se	135-425	.88 - .24	130 - 30	400 - 250

Precipitation Hardening Stainless Steels, Cast
	ACI Grade C8-7CU	325-450	.12 - .08	20 - 10	130 - 40
	ACI Grade C0-4MO	325-450	.12 - .08	20 - 10	130 - 40

Precipitation Hardening Stainless Steels, Wrought
	15-5 PH, 17-4 PH, 17-7 PH	150-375	.32 - .16	60 - 20	300 - 100
	17-14 CuMo AM-350
	AM-355, PH 13-8 Mo
	PH14-8 Mo, PH 15-7 Mo

Titanium Alloys, Wrought
Commercially Pure	99.5, 99.2, 99.0, TI-0.2Pd,	110-275	.96 - .64	180 - 80	800 - 330
	99.0, 98.9	110-275	.96 - .64	180 - 80	800 - 330

Alpha and Alpha-Beta Alloys	Ti-8Mn,	300-340	0.46	80 - 55	380 - 310
	Ti-2A1-11Sn-5Zr-1Mo,
	Ti-5A1-2-5Sn,
	Ti-5A1-6Sn-2Zr-1Mo,
	Ti-6A1-2Sn-4Zr-2Mo-25Si
	Ti-6A1-2Sn-4Zr-6Mo

	Ti-6A1-4V	310-350	0.36	60 - 40	300 - 250
	Ti-6A1-4V-CL1 (???)	310-350	0.36	60 - 40	300 - 250

	Ti-6A1-6V-2Sn	320-370	0.32	60 - 30	300 - 250
	Ti-7A1-4Mo	320-370	0.32	60 - 30	300 - 250

	Ti-1A1-8V-5Fe	320-380	0.28	60 - 30	300 - 250

	Ti-6A1-4V	320-380	0.24	45 - 30	300 - 250
	Ti-6A1-2Sn-4Zr-2Mo
	Ti-6A1-2Sn-4Zr-6Mo

	Ti-4A1-3Mo-1V	375-420	0.2	15 - 10 OR LESS	60 - 40 OR LESS
	Ti-7A1-4Mo	375-420	0.2	15 - 10 OR LESS	60 - 40 OR LESS

	Ti-1A1-8V-5Fe	375-440	0.12	20 - 15	130 - 90

Beta Alloys	Ti-3A1-8V-6Cr-4Mo-4Zr	275-440	.20 - .09	35 - 10	235 - 40
	Ti-4.5Sn-6Zr-11.5Mo
	Ti-13V-11Cr-3A1

Tool Steels, Wrought
High Speed	M1, M2, M6, M10, T1, T2,	220-275	.32 - .20	60 - 25	300 - 160
	T6, M3 Type 2, T15	220-275	.32 - .20	60 - 25	300 - 160

	M3, M7, M33, M34, M36,	225-275	0.28	60 - 30	300 - 250
	M41, M42, M43, M44,
	M46, M47, T4, T5

Hot Work	H10, H11, H12,	150-375 (48Rc-50Rc)	.32 - .08	60 - 10	300 - 40
	H13, H14	150-375 (48Rc-50Rc)	.32 - .08	60 - 10	300 - 40

	H21, H24, H41, H42	150-250	.32 - .24	60 - 30	300 - 250

Cold Work	A7, D4	200-250	0.2	15 - 10 OR LESS	60 - 40 OR LESS

	A2, A4, A8, A10, 01, 02,	200-250	0.32	60 - 30	300 - 250
	06, 07	200-250	0.32	60 - 30	300 - 250

Shock Resisting	S1, S2, S5, S7	175-225	0.44	70 - 55	420 - 310

Zinc Alloys, Cast
	AMS 4803A, ILZRO 12,	80-100	2.00	400 - 180	2500 - 500
	ILZRO 13, SAE 903, SAE 925,
	ZDC No. 7

Zirconium Alloys, Wrought
	Zr-2%Hf (Grade 11)	140-280	1.20	190 - 120	500 - 300
	Zr-0.0C1%Hf (Grade 21)
	Zircaloy 2 (Grade 32)
	Zircaloy 4 (Grade 34)