Alnico Magnets - Armstrong Magnetics, Inc.

Alnico has a low coercive force
The Hc of Alnico drops in the range of 500 - 1,800 Oe, so that it is easily demagnetized if not handled with care. In order to get a good work point of Alnico, the ratio of length to diameter should be 5:1 or larger.

Alnico is hard and brittle
Alnico can be machined by Grinding and EDM only.

Cast Alnico Properties

Grades	Equivalent MMPA	Remanence Br		Coercive Force Hcb		Maximum Energy Product (BH)max		Density	Reversible Temp. Coefficient а(Br)	Reversible Temp. Coefficient а(Hc)	Curie Temp. TC	Temp. Coefficient TW	Remark
Grades	Equivalent MMPA	mT	Gs	KA/m	Oe	KJ/m3	MGOe	g/cm3	%/℃	%/℃	℃	℃	Remark
LN10	Alnico3	600	6000	40	500	10	1.2	6.9	-0.03	-0.02	810	450	Isotropy
LNG13	Alnico2	700	7000	48	600	12.8	1.6	7.2	-0.03	+0.02	810	450
LNGT18	Alnico8	580	5800	100	1250	18	2.2	7.3	-0.025	+0.02	860	550
LNG37	Alnico5	1200	12000	48	600	37	4.65	7.3	-0.02	+0.02	850	525	Anisotropy
LNG40		1250	12500	48	600	40	5	7.3
LNG44		1250	12500	52	650	44	5.5	7.3
LNG52	Alnico5DG	1300	13000	56	700	52	6.5	7.3
LNG60	Alnico5-7	1350	13500	59	740	60	7.5	7.3
LNGT28	Alnico6	1000	10000	57.6	720	28	3.5	7.3	-0.02	+0.03	850	525
LNGT36J	Alnico8HC	700	7000	140	1750	36	4.5	7.3	-0.025	+0.02	860	550
LNGT38	Alnico8	800	8000	110	1380	38	4.75	7.3	-0.025	+0.02	860	550
LNGT40	Alnico8	820	8200	110	1380	40	5	7.3	-0.025	+0.02	860	550
LNGT60	Alnico9	950	9500	110	1380	60	7.5	7.3	-0.025	+0.02	860	550
LNGT72	Alnico9	1050	10500	112	1400	72	9	7.3	-0.025	+0.02	860	550

Sintered Alnico Properties

Grades	Equivalent MMPA	Remanence Br		Coercive Force Hcj		Coercive Force Hcb		Maximum Energy Product (BH)max		Density	Reversible Temp. Coefficient	Curie Temp. TC	Temp. Coefficient TW	Remark
		Remanence Br		Coercive Force Hcj		Coercive Force Hcb		Maximum Energy Product (BH)max		g/cm3	α（Br）	Curie Temp. TC	Temp. Coefficient TW
		mT	Gs	KA/m	Oe	KA/m	Oe	KJ/m3	MGOe	g/cm3	%/℃	℃	℃
SLN8	Alnico3	520	5200	43	540	40	500	8-10	1.0-1.25	6.8	-0.02	760	450	Isotropy
SLNG12	Alnico2	700	7000	43	540	40	500	12-14	1.5-1.75	7.0	-0.014	810	450
SLNGT18	Alnico8	600	6000	107	1350	95	1200	18-22	2.25-2.75	7.2	-0.02	850	550
SLNGT28	Alnico6	1000	10000	57	710	56	700	28-30	3.5-3.8	7.2	-0.02	850	525	Anisotropy
SLNG34	Alnico5	1100	11000	51	640	50	630	34-38	3.5-4.15	7.2	-0.016	890	525
SLNGT31	Alnico8	780	7800	106	1130	104	1300	33-36	3.9-4.5	7.2	-0.02	850	550
SLNGT38		800	8000	126	1580	123	1550	38-42	4.75-5.3	7.2	-0.02	850	550
SLNGT42		880	8800	122	1530	120	1500	42-48	5.3-6.0	7.25	-0.02	850	550
SLNGT38J	Alnico8HC	730	7300	163	2050	151	1900	38-40	4.75-5.0	7.2	-0.02	850	550