NdFeB magnets_Ningbo Vormag Electronics Co.,Ltd

NdFeB magnets

Sintered Neodymium magnets (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure.

NdFeB magnets were developed in the 1980s, becoming the third generation of permanent magnets, which are the strongest type of permanent magnet available commercially and the most common type of rare earth magnet.
NdFeB magnets can be classified as sintered or bonded, depending on the manufacturing process used.

The main shapes of sintered NdFeB magnet products include square, cylinders, rings, tiles, and various special-shaped products. In actual production, large rough blanks are produced first, and the final specific sizes are obtained through post-processing according to the requirements of customers.

Grade & types of neodymium magnets

Grade	Remanence,Br		Coercivity,Hcb		Intrinsic Coercivity, Hcj		Maximum Energy Product, (BH)max		Working Temp.,
	mT	kGs	kA/m	kOe	kA/m	kOe	kJ/m3	MGOe	Celsius ℃
N55	1470-1520	14.7-15.3	≥860	≥10.8	≥876	≥11	414-438	52-56	70
N52	1430-1480	14.3-14.8	≥860	≥10.8	≥876	≥11	398-422	50-53	70
N50	1400-1450	14.0-14.5	≥860	≥10.8	≥960	≥12	382-406	48-51	70
N48	1380-1420	13.8-14.2	≥836	≥10.5	≥900	≥11	366-390	46-49	80
N45	1380-1420	13.2-13.8	≥876	≥11.0	≥960	≥12	342-366	43-46	80
N42	1280-1320	12.8-13.2	≥923	≥11.6	≥960	≥12	318-342	40-43	80
N40	1250-1280	12.5-12.8	≥923	≥11.6	≥960	≥12	302-326	38-41	80
N38	1220-1250	12.2-12.5	≥899	≥11.3	≥960	≥12	287-310	36-39	80
N35	1170-1210	11.7-12.2	≥868	≥10.9	≥960	≥12	263-287	33-36	80
N33	1130-1180	11.3-11.8	≥836	≥10.5	≥960	≥12	247-270	31-34	80
N30	1080-1130	10.8-11.3	≥796	≥10	≥960	≥12	223-247	28-31	80
N52M	1430-1480	14.3-14.8	≥1035	≥13.0	≥1114	≥14	398-414	50-52	100
N50M	1400-1450	14.0-14.5	≥1035	≥13.0	≥1114	≥14	382-406	48-51	100
N48M	1360-1430	13.7-14.3	≥1027	≥12.9	≥1114	≥14	366-390	46-49	100
N45M	1320-0380	13.2-13.8	≥995	≥12.5	≥1114	≥14	342-366	43-46	100
N42M	1280-1320	12.8-13.2	≥955	≥12.0	≥1114	≥14	318-342	40-43	100
N40M	1250-1280	12.5-12.8	≥923	≥11.6	≥1114	≥14	302-326	38-41	100
N38M	1220-1250	12.2-12.5	≥899	≥11.3	≥1114	≥14	287-310	36-39	100
N35M	1170-1220	11.7-12.2	≥868	≥10.9	≥1114	≥14	263-287	33-36	100
N33M	1130-1180	11.3-11.8	≥836	≥10.5	≥1114	≥14	247-270	31-34	100
N30M	1080-1130	10.8-11.3	≥796	≥10	≥1114	≥14	223-247	28-31	100
N50H	1400-1450	14.0-14.5	≥1035	≥13.0	≥1274	≥16	382-406	48-51	120
N48H	1370-1430	13.7-14.3	≥1035	≥13.0	≥1274	≥16	366-390	46-49	120
N46H	1330-1380	13.3-13.8	≥1018	≥12.8	≥1274	≥16	350-374	44-47	120
N45H	1330-1380	13.3-13.8	≥1010	≥12.7	≥1353	≥17	342-366	43-46	120
N44H	1310-1360	13.1-13.8	≥1003	≥12.6	≥1353	≥17	326-358	42-45	120
N42H	1280-1320	12.8-13.2	≥995	≥12.5	≥1353	≥17	318-342	40-43	120
N40H	1250-1280	12.5-12.8	≥940	≥11.8	≥1353	≥17	302-326	38-41	120
N38H	1220-1250	12.2-12.5	≥899	≥11.3	≥1353	≥17	287-310	36-39	120
N35H	1170-1220	11.7-12.2	≥876	≥11.0	≥1353	≥17	263-287	33-36	120
N33H	1130-1180	11.3-11.8	≥844	≥10.6	≥1353	≥17	247-271	31-34	120
N30H	1080-1130	10.8-11.3	≥812	≥10.2	≥1353	≥17	223-247	28-31	120

Grade	Remanence,Br		Coercivity,Hcb		Intrinsic Coercivity, Hcj		Maximum Energy Product, (BH)max		Working Temp.,
	mT	kGs	kA/m	kOe	kA/m	kOe	kJ/m3	MGOe	Celsius ℃
N48SH	1370-1430	13.7-14.3	≥1003	≥12.6	≥1600	≥20	366-390	46-49	150
N45SH	1320-1380	13.2-13.8	≥1003	≥12.6	≥1600	≥20	342-366	43-46	150
N44SH	1310-1350	13.1-13.5	≥1003	≥12.6	≥1600	≥20	334-358	42-45	150
N42SH	1280-1320	12.8-13.2	≥995	≥12.5	≥1600	≥20	318-342	40-43	150
N40SH	1250-1280	12.5-12.8	≥947	≥11.9	≥1600	≥20	302-326	38-41	150
N38SH	1220-1250	12.2-12.5	≥931	≥11.7	≥1600	≥20	287-310	36-39	150
N35SH	1170-1220	11.7-12.2	≥907	≥11.4	≥1600	≥20	263-287	33-36	150
N33SH	1130-1170	11.3-11.7	≥844	≥10.6	≥1600	≥20	247-271	31-34	150
N30SH	1080-1130	10.8-11.3	≥804	≥10.1	≥1600	≥20	223-247	28-31	150
N42UH	1280-1320	12.8-13.2	≥907	≥11.4	≥2000	≥25	318-342	40-43	180
N40UH	1240-1280	12.4-12.8	≥907	≥11.4	≥2000	≥25	302-326	38-41	180
N38UH	1220-1250	12.2-12.5	≥907	≥11.4	≥2000	≥25	287-310	36-39	180
N35UH	1180-1220	11.8-12.2	≥875	≥11.0	≥2000	≥25	263-287	33-36	180
N33UH	1130-1170	11.3-11.7	≥844	≥10.6	≥2000	≥25	247-271	31-34	180
N30UH	1020-1080	10.8-11.3	≥835	≥10.5	≥2000	≥25	223-247	28-31	180
N28UH	1050-1080	10.5-10.8	≥764	≥9.6	≥2000	≥25	207-239	26-30	180
N42EH	1280-1310	12.8-13.1	≥907	≥11.4	≥2388	≥30	320-340	38-41	200
N40EH	1240-1280	12.5-12.8	≥907	≥11.4	≥2388	≥30	302-326	38-41	200
N38EH	1220-1250	12.2-12.8	≥907	≥11.4	≥2388	≥30	287-310	36-39	200
N35EH	1170-1220	11.7-12.2	≥876	≥11.0	≥2388	≥30	263-287	33-36	200
N33EH	1130-1170	11.3-11.7	≥812	≥10.2	≥2388	≥30	247-271	31-34	200
N30EH	1080-1130	10.8-11.3	≥812	≥10.2	≥2388	≥30	223-247	28-31	200
N28EH	1040-1090	10.4-10.9	≥780	≥9.8	≥2400	≥30	207-231	26-29	200
N38AH	1220-1250	12.2-12.5	≥907	≥11.4	≥2706	≥34	287-310	36-39	240
N35AH	1170-1220	11.7-12.2	≥812	≥10.2	≥2785	≥35	263-287	33-36	240
N33AH	1130-1170	11.3-11.7	≥812	≥10.2	≥2785	≥35	247-271	31-34	240
N30AH	1080-1130	10.8-11.3	≥812	≥10.2	≥2785	≥35	223-247	28-31	240

* The temperature ratings are guideline values.
* The data of magnetic parameters and physical properties are given at room temperature (20℃).
* The actual maximum temperature and performance of magnets is also subject to magnet shape, the ratio of length and diameter, coating and applications.

Physical Characteristics (Typical)

Characteristic	Symbol	Unit	Value
Density	D	g/cm	7.45-7.65
Vickers Hardness	Hv	D.P.N	620
Compression Strength	C.S	N/mm2	780
Coefcient of Thermal Expansion	C//	10-6/°C	3.4
Coefcient of Thermal Expansion	CŁ	10-6/°C	-4.8
Electrical Resistivity	ƿ	µ Ω.cm	1.8x10 x^(-4)
Temperature coefcient of resistivity	α	10x^(-4)/°C	2
Electrical Conductivity	σ	kCal/(m.h.°C)	0.667
Thermal Conductivity	k	kCal/(kg.°C)	8.9551
Specifc Heat Capacity	c	kg/mm2	0.12
Tensile Strength	σUTS, or SU	Mpa	80
Young's Modulus	λ / E	10-12m2/N	0.16x1011
Flexural Strength	β	10-12m2/N	9.8
Compressibility	σ	10-12m2/N	9.8
Rigidity	E.I	N/m2	0.64
Poisson's Ratio	ν		0.24
Curie Temperature	Tc	°C	310-380

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Grade & types of neodymium magnets

Physical Characteristics (Typical)

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