permanent magnet

NdFeB Magnets

permanent magnet

NdFeB Magnets

Neodymium magnets

Neodymium magnets (also known as “NdFeB”, “Neo” or “NIB” magnets), are strong permanent magnets made from an alloy of neodymium, iron & boron. Part of the Rare-Earth magnet family, they have the highest magnetic properties of all permanent magnets. Due to their high magnetic strength and relatively low-cost, neodymium magnets are the preferred choice for many consumer, commercial, industrial and technical applications.

Magnetic Properties

Series	Grade	Br		Hcb		Hcj		(BH)_max		TW
Series	Grade	mT	KGs	KA/m	kOe	kA/m	kOe	kJ/m³	MGOe	°C
N	N35	1170-1220	11.7-12.2	≥868	≥10.9	≥955	≥12	263-287	33-36	≤80
	N38	1220-1250	12.2-12.5	≥899	≥11.3	≥955	≥12	287-310	36-39	≤80
	N40	1250-1280	12.5-12.8	≥907	≥11.4	≥955	≥12	302-326	38-41	≤80
	N42	1280-1320	12.8-13.2	≥915	≥11.5	≥955	≥12	318-342	40-43	≤80
	N45	1320-1380	13.2-13.8	≥923	≥11.6	≥955	≥12	342-366	43-46	≤80
	N48	1380-1420	13.8-14.2	≥923	≥11.6	≥955	≥12	366-390	46-49	≤80
	N50	1400-1450	14.0-14.5	≥860	≥10.8	≥955	≥12	382-406	48-51	≤80
	N52	1430-1480	14.3-14.8	≥860	≥10.8	≥955	≥12	398-422	50-53	≤80
	N54	1460-1500	14.6-15.0	≥860	≥10.8	≥955	≥12	414-438	53-57	≤80
	N56	1480-1520	14.8-15.2	≥836	≥10.5	≥875	≥11	422-454	53-57	≤80

M	35M	1170-1220	11.7-12.2	≥868	≥10.9	≥1114	≥14	263-287	33-36	≤100
	38M	1220-1250	12.2-12.5	≥899	≥11.3	≥1114	≥14	287-310	36-39	≤100
	40M	1250-1280	12.5-12.8	≥923	≥11.6	≥1114	≥14	302-326	38-41	≤100
	42M	1280-1320	12.8-13.2	≥955	≥12.0	≥1114	≥14	318-342	40-43	≤100
	45M	1320-1380	13.2-13.8	≥995	≥12.5	≥1114	≥14	342-366	43-46	≤100
	48M	1360-1430	13.6-14.3	≥1027	≥12.9	≥1114	≥14	366-390	46-49	≤100
	50M	1400-1450	14.0-14.5	≥1033	≥13.0	≥1114	≥14	382-406	48-51	≤100
	52M	1420-1480	14.2-14.8	≥1043	≥13.1	≥1114	≥14	398-422	50-53	≤100
	54M	1450-1500	14.5-15.0	≥995	≥12.5	≥1035	≥13	406-438	51-55	≤100

H	35H	1170-1220	11.7-12.2	≥868	≥10.9	≥1353	≥17	263-287	33-36	≤120
	38H	1220-1250	12.2-12.5	≥899	≥11.3	≥1353	≥17	287-310	36-39	≤120
	40H	1250-1280	12.5-12.8	≥923	≥11.6	≥1353	≥17	302-326	38-41	≤120
	42H	1280-1320	12.8-13.2	≥955	≥12.0	≥1353	≥17	318-342	40-43	≤120
	45H	1300-1360	13.0-13.6	≥963	≥12.1	≥1353	≥17	326-358	43-46	≤120
	48H	1370-1430	13.7-14.3	≥995	≥12.5	≥1353	≥17	366-390	46-49	≤120
	50H	1400-1450	14.0-14.5	≥1003	≥12.6	≥1353	≥17	382-406	48-51	≤120
	52H	1420-1480	14.2-14.8	≥1035	≥13.0	≥1353	≥17	390-422	49-53	≤120

SH	33SH	1130-1170	11.3-11.7	≥860	≥10.6	≥1592	≥20	247-271	31-34	≤150
	35SH	1170-1220	11.7-12.2	≥876	≥11.0	≥1592	≥20	263-287	33-36	≤150
	38SH	1220-1250	12.2-12.5	≥907	≥11.4	≥1592	≥20	287-310	36-39	≤150
	40SH	1240-1280	12.5-12.8	≥939	≥11.8	≥1592	≥20	302-326	38-41	≤150
	42SH	1280-1320	12.8-13.2	≥963	≥12.1	≥1592	≥20	318-342	40-43	≤150
	45SH	1320-1380	13.2-13.8	≥979	≥12.3	≥1592	≥20	342-366	43-46	≤150
	48SH	1370-1430	13.7-14.3	≥1019	≥12.8	≥1592	≥20	366-390	46-49	≤150
	50SH	1400-1450	14.0-14.5	≥1019	≥12.8	≥1592	≥20	374-406	47-51	≤150
	52SH	1420-1480	14.2-14.8	≥1035	≥13.0	≥1512	≥19	390-422	49-53	≤150

UH	28UH	1020-1080	10.2-10.8	≥764	≥9.6	≥1990	≥25	207-231	26-29	≤180
	30UH	1080-1130	10.8-11.3	≥812	≥10.2	≥1990	≥25	223-247	28-31	≤180
	33UH	1130-1170	11.3-11.7	≥852	≥10.7	≥1990	≥25	247-271	31-34	≤180
	35UH	1180-1220	11.8-12.2	≥860	≥10.8	≥1990	≥25	263-287	33-36	≤180
	38UH	1220-1250	12.2-12.5	≥899	≥11.0	≥1990	≥25	287-310	36-39	≤180
	40UH	1250-1280	12.5-12.8	≥939	≥11.3	≥1990	≥25	302-326	38-41	≤180
	42UH	1280-1320	12.8-13.2	≥963	≥12.1	≥1990	≥25	318-342	40-43	≤180
	45UH	1320-1380	13.2-13.8	≥979	≥12.3	≥1990	≥25	342-366	43-46	≤180
	48UH	1380-1420	13.8-14.2	≥1019	≥12.8	≥1910	≥24	366-390	46-49	≤180

EH	28EH	1040-1090	10.4-10.9	≥780	≥9.8	≥2388	≥30	207-231	26-29	≤200
	30EH	1080-1130	10.8-11.3	≥812	≥10.2	≥2388	≥30	223-247	28-31	≤200
	33EH	1130-1170	11.3-11.7	≥836	≥10.5	≥2388	≥30	247-271	31-34	≤200
	35EH	1170-1220	11.7-12.2	≥876	≥11.0	≥2388	≥30	263-287	33-36	≤200
	38EH	1220-1250	12.2-12.5	≥899	≥11.3	≥2388	≥30	287-310	36-39	≤200
	40EH	1250-1280	12.5-12.8	≥923	≥11.6	≥2388	≥30	302-326	38-41	≤200
	42EH	1280-1320	12.8-13.2	≥931	≥11.7	≥2388	≥30	318-342	40-43	≤200
	45EH	1330-1380	13.3-13.8	≥995	≥12.5	≥2308	≥29	342-366	43-46	≤200

AH	28AH	1040-1090	10.4-10.9	≥787	≥9.9	≥2624	≥33	207-231	26-29	≤230
	30AH	1080-1130	10.8-11.3	≥819	≥10.3	≥2624	≥33	223-247	28-31	≤230
	33AH	1130-1170	11.3-11.7	≥843	≥10.6	≥2624	≥33	247-271	31-34	≤230
	35AH	1170-1220	11.7-12.2	≥876	≥11.0	≥2624	≥33	263-287	33-36	≤230
	38AH	1220-1250	12.2-12.5	≥899	≥11.3	≥2624	≥33	287-310	36-39	≤230
	40AH	1250-1280	12.5-12.8	≥923	≥11.6	≥2624	≥33	302-326	38-41	≤230
	42AH	1290-1330	12.9-13.3	≥955	≥12.0	≥2624	≥33	318-342	40-43	≤230

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Surface Treatment

Coating	Thickness (μm)	Color	SST (hrs)	PCT/HAST (hrs)	Operation Temperature (°C)	Corrosive Resistance	Application
Zn	4-15	Bright blue	24	–	≤160	Good	Suitable for working conditions with low corrosive and humidity requirements.
Ni-Cu-Ni	5-20	Bright silver	48	48	≤200	Excellent	Most regular used multi-layer coating.
Electroless Ni	5-20	Dark silver	72	48	≤200	Excellent performance with uniform appearance.	Suitable for working conditions with high corrosive and humidity requirements.
Ni-Cu-Ni-Au	5-20	Golden	72	96	≤200	Good	Suitable for parts that placed into the high reliable electronic equipments or decoration.
Ni-Cu-Ni-Ag	5-20	Silver	72	96	≤160	Good	Suitable for parts that may be welded or placed into the electric equipment.
Ni-Cu-Ni-Sn	5-20	Silver	72	96	≤200	Excellent	Suitable for parts that may be welded or placed into electric equipment.
Passivation	1-3	Dark grey	–	–	≤200	Poor	Temporary protection.
Aluminum	2-15	Bright silver	240	168	≤400	Excellent	Suitable for working conditions with very high corrosive and humidity requirements.
Epoxy resin	10-30	Black/Grey	96	24	≤160	Excellent. Superior binding force.	Suitable for parts used to insulate the electric equipments or placed in the high corrosive industrial atmosphere.
Parylene	5-20	Colorless	168	–	≤200	Excellent	Free of pore. Suitable for biomedical applications.
Everlube	10-15	Golden yellow	96	72	≤200	Excellent	Suitable for working conditions with very high corrosive and humidity requirements.

Note:

1. The SST results differ from coating. In general, Salt Spray Test results, which is coated by grinding (small size magnets), is better than the one, which is coated by hanging up (big size magnets).

2. Salt Spray Test (SST) condition: 5% NaCl, 35℃, continuously spray a certain time, test whether there is corrosion on coating surface.

3. Pressure Cooking Test (PCT) condition: 2 atm, 95% RH (relative humidity), 121℃ to test the coating adhesion. (Zinc, Passivated, and Epoxy are not suitable for PCT).

4. Other test methods for coating: Drop Test, Cross Cut test, Heating and Spilling Test, Constant Temperature and Humidity Test and etc.

Temperature Characteristics

Low-grade neodymium magnets may lose their magnetic strength if heated above 80°C. High-grade neodymium magnets have been developed to operate at temperatures up to 220°C with minimal irreversible loss. The demand for a low temperature coefficient in neodymium magnet applications has led to the development of various grades to meet specific operational requirements.

Application

Sintered NdFeB magnets are utilized across a broad range of industries, including but not limited to electronics (such as mobile phones and hard drives), automotive engineering (in electric motors and sensors), medical technology (in MRI machines), and the energy transportation sector. As technology continues to advance, sintered NdFeB magnets are experiencing significant growth in emerging fields like electric vehicles, wind power generation, and energy-efficient home appliances. This material has redefined the limits of what is achievable in the realm of magnetic materials, establishing it as a cornerstone in modern engineering.

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