strong rare earth Neodymium Block Magnets

Neodymium (NdFeB) magnets, the third generation of rare earth permanent Neodymium magnet, are composed of Neodymium, Iron, Boron and a few transition metals. They have high remanence, high coercive force, high energy product, and high performance /cost. Currently Neodymium (NdFeB) magnets are the strongest magnets available in the world.

Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB (Neodymium) powder, then fine NdFeB powder will be compacted in a die and sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing and isostatic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.

Generally, (Neodymium) NdFeB magnets must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on Neodymium (NdFeB) materials using carbide tools, but surface finishes thus obtained may be less than optimal. The Standard tolerances for NdFeB (Neodymium) magnets are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.

The corrosion resistance of NdFeB (Neodymium) magnets is considered poor. Surface coating or plating is therefore highly recommended for NdFeB (Neodymium) magnets. All kinds of surface coating are available, like Nickel, Zn, Ni-Cu-Ni, Gold, Silver, Sn, Chrome and etc.

Widely used in automobiles, mobile phones, digital cameras, jewelry, clothing, all kinds of hardware accessories, electrical, laser heads, toys, gifts, speakers, packing, leather goods, medical equipment and adverying, Switchboard, voice coil motors (VCM's) in hard disk drives, high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors, loudspeakers etc.

Grade	Residual Induction	Coercive Force	Intrinsic CoerciveForce	Maximum Energy Product	Maximum WorkingTemperature
	Br	Hcb	Hcj	(BH)max	Tw
	mT	kA/m	kA/m	kJ/m3
	[kGs]	[kOe]	[kOe]	[MGOe]
N35	1170-1220	≥868	≥955	263-287	80°
	[11.7-12.2]	[≥10.9]	[≥12]	[33-36]
N38	1220-1250	≥899	≥955	287-310	80°
	[12.2-12.5]	[≥11.3]	[≥12]	[36-39]
N40	1250-1280	≥907	≥955	302-326	80°
	[12.5-12.8]	[≥11.4]	[≥12]	[38-41]
N42	1280-1320	≥915	≥955	318-342	80°
	[12.8-13.2]	[≥11.5]	[≥12]	[40-43]
N45	1320-1380	≥923	≥955	342-366	80°
	[13.2-13.8]	[≥11.6]	[≥12]	[43-46]
N48	1380-1420	≥923	≥955	366-390	80°
	[13.8-14.2]	[≥11.6]	[≥12]	[46-49]
N50	1400-1450	≥796	≥876	382-406	80°
	[14.0-14.5]	[≥10.0]	[≥11]	[48-51]
N52	1430-1480	≥796	≥876	398-422	80°
	[14.3-14.8]	[≥10.0]	[≥11]	[50-53]
30M	1080-1130	≥805	≥1114	223-247	100°
	[10.8-11.3]	[≥10.1]	[≥14]	[28-31]
33M	1130-1170	≥836	≥1114	247-263	100°
	[11.3-11.7]	[≥10.5]	[≥14]	[31-33]
35M	1170-1220	≥868	≥1114	263-287	100°
	[11.7-12.2]	[≥10.9]	[≥14]	[33-36]
38M	1220-1250	≥899	≥1114	287-310	100°
	[12.2-12.5]	[≥11.3]	[≥14]	[36-39]
40M	1250-1280	≥923	≥1114	302-326	100°
	[12.5-12.8]	[≥11.6]	[≥14]	[38-41]
42M	1280-1320	≥955	≥1114	318-342	100°
	[12.8-13.2]	[≥12.0]	[≥14]	[40-43]
45M	1320-1380	≥995	≥1114	342-366	100°
	[13.2-13.8]	[≥12.5]	[≥14]	[43-46]
48M	1370-1430	≥1027	≥1114	366-390	100°
	[13.7-14.3]	[≥12.9]	[≥14]	[46-49]
50M	1400-1450	≥1033	≥1114	382-406	100°
	[14.0-14.5]	[≥13.0]	[≥14]	[48-51]
35H	1170-1220	≥868	≥1353	263-287	120°
	[11.7-12.2]	[≥10.9]	[≥17]	[33-36]
38H	1220-1250	≥899	≥1353	287-310	120°
	[12.2-12.5]	[≥11.3]	[≥17]	[36-39]
40H	1250-1280	≥923	≥1353	302-326	120°
	[12.5-12.8]	[≥11.6]	[≥17]	[38-41]
42H	1280-1320	≥955	≥1353	318-342	120°
	[12.8-13.2]	[≥12.0]	[≥17]	[40-43]
45H	1320-1360	≥963	≥1353	342-366	120°
	[13.2-13.6]	[≥12.1]	[≥17]	[43-46]
48H	1370-1430	≥995	≥1353	366-390	120°
	[13.7-14.3]	[≥12.5]	[≥17]	[46-49]
35SH	1170-1220	≥876	≥1592	263-287	150°
	[11.7-12.2]	[≥11.0]	[≥20]	[33-36]
38SH	1220-1250	≥907	≥1592	287-310	150°
	[12.2-12.5]	[≥11.4]	[≥20]	[36-39]
40SH	1250-1280	≥939	≥1592	302-326	150°
	[12.5-12.8]	[≥11.8]	[≥20]	[38-41]
42SH	1280-1320	≥987	≥1592	318-342	150°
	[12.8-13.2]	[≥12.4]	[≥20]	[40-43]
45SH	1320-1380	≥1003	≥1592	342-366	150°
	[13.2-13.8]	[≥12.6]	[≥20]	[43-46]
28UH	1040-1080	≥764	≥1990	207-231	180°
	[10.4-10.8]	[≥9.6]	[≥25]	[26-29]
30UH	1080-1130	≥812	≥1990	223-247	180°
	[10.8-11.3]	[≥10.2]	[≥25]	[28-31]
33UH	1130-1170	≥852	≥1990	247-271	180°
	[11.3-11.7]	[≥10.7]	[≥25]	[31-34]
35UH	1170-1220	≥860	≥1990	263-287	180°
	[11.7-12.2]	[≥10.8]	[≥25]	[33-36]
38UH	1220-1250	≥876	≥1990	287-310	180°
	[12.2-12.5]	[≥11.0]	[≥25]	[36-39]
40UH	1250-1280	≥899	≥1990	302-326	180°
	[12.5-12.8]	[≥11.3]	[≥25]	[38-41]
28EH	1040-1080	≥780	≥2388	207-231	200°
	[10.4-10.8]	[≥9.8]	[≥30]	[26-29]
30EH	1080-1130	≥812	≥2388	223-247	200°
	[10.8-11.3]	[≥10.2]	[≥30]	[28-31]
33EH	1130-1170	≥876	≥2388	247-271	200°
	[11.3-11.7]	[≥10.5]	[≥30]	[31-34]
35EH	1170-1220	≥876	≥2388	263-287	200°
	[11.7-12.2]	[≥11.0]	[≥30]	[33-36]
38EH	1220-1250	≥899	≥2388	287-310	200°
	[12.2-12.5]	[≥11.3]	[≥30]	[36-39]
28AH	1040-1080	≥787	≥2624	207-231	220°
	[10.4-10.8]	[≥9.9]	[≥33]	[26-29]
30AH	1080-1130	≥819	≥2624	223-247	220°
	[10.8-11.3]	[≥10.3]	[≥33]	[28-31]
33AH	1130-1170	≥843	≥2624	247-271	220°
	[11.3-11.7]	[≥10.6]	[≥33]	[31-34]