NdFeB Magnet，the third generation of the rare earth magnetic material, is on of the best cost performance permanent magnetic materials with high coercive and excellent Br and Bh(max), which is made of Nd,Fe,B,Dy,Co and other minor elements. Because of good mechanical properties, it can be easily shaped into different sizes, therefore, it is widely used in motors, wind energy, Audio products, telecommunication, meters, magnetic resonance product, magnetic levitation product, VCM, MRI, etc.
Manufacturing Process
Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB 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 isocratic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.
Machining & Tolerance
Generally, NdFeB magnets must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on NdFeB materials using carbide tools, but surface finishes thus obtained may be less than optimal. The Standard tolerances for NdFeB magnets are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.
Magnetizing & Packing
NdFeB magnets require extremely high magnetizing fields, and can be magnetized in any direction as long as it is aligned properly. In some instances multiple pole magnetization is possible with special fixtures.All NdFeB magnets are anisotropic, and can only be magnetized in the orientation direction, so particular consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.NdFeB magnets are mechanically weak, and magnetically very strong. They should be packed properly in order to help user to use and handle them.

Type		Remanence Br		Coercive Force Hcb		Intrinsic Coercive force Hci		Max Energy Product (BH) max		Working Temp
No	Material	KG	T	KOe	KA/m	KOe	KA/m	MGOe	KJ/m	℃
1	N-33	11.4-11.8	1.14-1.18	≥10.5	≥836	≥12	≥955	31-33	247-263	80
2	N-35	11.4-11.8	1.18-1.28	≥10.8	≥836	≥12	≥955	33-36	263-287	80
3	N-38	11.8-12.3	1.18-1.28	≥10.8	≥860	≥12	≥955	36-39	287-310	80
4	N-40	12.7-12.9	1.27-1.29	≥11.0	≥876	≥12	≥955	38-41	303-326	80
5	N-42	12.9-13.3	1.29-1.33	≥10.5	≥836	≥12	≥955	40-43	318-342	80
6	N-45	13.3-13.8	1.33-1.38	≥9.5	≥756	≥12	≥955	43-46	342-366	80
7	N48	13.7-14.2	1.37-1.42	10.5-13	836-1035	≥11	≥875	46-49	366-390	80
8	N50	13.9-14.5	1.39-1.45	10.5-13	836-1035	≥11	≥875	47-51	374-406	60
9	N52	14.2-14.7	1.42-1.47	10.5-13	836-1035	≥11	≥875	48-53	406-430	60
10	N-30M	10.8-11.4	1.08-1.14	≥9.8	≥780	≥14	≥1114	28-31	223-247	100
11	N-33M	11.4-11.8	1.14-1.18	≥10.3	≥820	≥14	≥1114	31-33	247-263	100
12	N-35M	11.8-12.3	1.18-1.23	≥10.8	≥860	≥14	≥1114	33-36	263-287	100
13	N-38M	12.3-12.7	1.23-1.27	≥11.0	≥876	≥14	≥1114	38-41	303-326	100
14	N-40M	12.7-12.9	1.27-1.29	≥11.4	≥907	≥14	≥1114	38-41	303-326	100
15	N42M	12.8-13.4	1.28-1.34	10.8-11.4	859-907	≥14	≥1114	40-43	319-343	100
16	N45M	13.3-13.8	1.33-1.38	12.4-13.4	987-1066	≥14	≥1114	43-46	343-366	100
17	N48M	13.7-14.2	1.37-1.42	12.8-13.8	1020-1098	≥14	≥1114	46-49	366-390	100
18	N-30H	10.8-11.4	1.08-1.14	≥10.2	≥812	≥17	≥1353	28-31	223-247	120
19	N-33H	11.4-11.8	1.14-1.18	≥10.6	≥844	≥17	≥1353	31-33	247-263	120
20	N-35H	11.8-12.3	1.18-1.28	≥11.0	≥876	≥17	≥1353	33-36	263-287	120
21	N-38H	12.3-12.7	1.23-1.27	≥11.2	≥890	≥17	≥1353	36-39	287-310	120
22	N-40H	12.7-12.9	1.27-1.29	≥11.5	≥915	≥17	≥1353	38-41	303-326	120
23	N-42H	12.8-13.4	1.28-1.34	≥12	≥955	≥17	≥1353	40-43	318-342	120
24	N-45H	13.3-13.8	1.33-1.38	≥12.4	≥986	≥17	≥1353	43-46	342-366	120
25	N-48H	13.6-14.2	1.36-1.42	≥12.8	≥1018	≥16	≥1273	45-49	358-390	120
26	N-30SH	10.8-11.4	1.081.14	≥10.0	≥796	≥21	≥1672	28-31	223-247	150
27	N-33SH	11.4-11.8	1.14-1.18	≥10.5	≥836	≥21	≥1672	31-34	247-276	150
28	N-35SH	11.8-12.3	1.18-1.23	≥11.0	≥876	≥21	≥1672	33-36	263-278	150
29	N-38SH	12.3-12.7	1.23-1.27	≥11.4	≥907	≥21	≥1672	36-39	278-310	150
30	N-42SH	12.8-13.4	1.28-1.34	≥12	≥955	≥20	≥1592	39-42	310-334	150
31	N-28UH	10.5-10.8	1.05-1.08	≥9.5	≥756	≥21	≥1672	26-29	207-231	180
32	N-30UH	10.8-11.4	1.08-1.14	≥9.5	≥756	≥25	≥1990	28-31	223-247	180
33	N-33UH	11.4-12.1	1.14-1.21	≥10.1	≥804	≥25	≥1990	31-34	247-271	180
34	N-35UH	11.7-12.4	1.17-1.24	≥10.5	≥836	≥25	≥1990	33-36	263-287	180
35	N-38UH	12.2-12.9	1.22-1.29	≥11	≥875	≥25	≥1990	36-39	287-310	180
36	N-40UH	12.5-13.3	1.25-1.33	≥11.3	≥899	≥25	≥1990	38-41	302-326	180
37	N-28EH	10.5-10.8	1.05-1.08	≥9.5	≥756	≥25	≥2388	26-29	207-231	200
38	N-30EH	10.8-11.4	1.08-1.14	≥9.5	≥756	≥30	≥2388	28-31	223-241	200
39	N-33EH	11.4-12.1	1.14-1.21	≥10.7	≥852	≥30	2388	31-35	247-379	200
40	N-35EH	11.7-12.4	1.17-1.24	≥10.9	≥868	≥30	≥2388	33-37	263-295	200
41	N-38EH	12.2-12.9	1.22-1.29	≥11.5	≥915	≥30	≥2388	36-40	287-318	20

Thermal Conductivity	7.7 kcal/m-h-°C7.7 kcal/m-h-°C
Young’s ModulusYoung’s Modulus	1.7 x 104 kg/mm21.7 x 104 kg/mm2
Bending StrengthBending Strength	24 kg/mm2
Compressive Strengthv	80 kg/mm2
Electrical Resistivity	160 μ-ohm-cm/cm2
Density	7.4-7.5 g/cm3
Vickers Hardness	500 - 600