Arc magnet for step motor is made of neodymium-iron-boron, rare earth, permanent magnet, it has strong magnetic power and coercive force, and the cost performance is excellent, the mechanical property is superior.
1)Attributes of Neodymium.
2)Very high resistance to demagnetization
3)High energy for size
4)Good in ambient temperature
5)Moderately priced
6)Material is corrosive and should be coated for long term maximum energy output
7)Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically.
8)Coatings of magnets: Z, Ni, epoxy
9)High grade can be used, such as N38SH, N38, N42, N40, N45H
Applications of Neodymium magnets
Magnetic separators, linear actuators, microphone assemblies, servo motors, DC motors (automotive starters), computer rigid disc drives, printers and speakers.

Grade	Remanence induction		Coercive force		Intrinsic Coercive force		maximum Energy product		Temperature	Density
	Br		Hcb		Hcj		(BH)max		Tw	ρ
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m 3	MGOe	ºC	g/cm 3
N33	1.14-1.17	11.4-11.7	≥836	≥10.5	≥955	≥12	247-263	31-33	≤80	≥7.4
N35	1.17-1.22	11.7-12.2	≥859	≥10.8	≥955	≥12	263-287	33-36	≤80	≥7.4
N38	1.22-1.26	12.2-12.6	≥859	≥10.8	≥955	≥12	287-303	36-38	≤80	≥7.5
N40	1.26-1.29	12.6-12.9	≥836	≥10.5	≥955	≥12	303-318	38-40	≤80	≥7.5
N42	1.29-1.32	12.9-13.2	≥836	≥10.5	≥955	≥12	318-342	40-43	≤80	≥7.5
N45	1.32-1.37	13.2-13.7	≥836	≥10.5	≥955	≥12	342-359	43-45	≤80	≥7.5
N48	1.36-1.42	13.6-14.2	≥836	≥10.5	≥955	≥12	358-382	45-49	≤80	≥7.5
N50	1.40-1.45	14.0-14.5	≥836	≥10.5	≥955	≥12	374-406	47-51	≤80	≥7.5
N52	1.42-1.48	14.2-14.8	≥836	≥10.5	≥876	≥11	389-422	49-53	≤80	≥7.5
N30M	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1114	≥14	223-247	28-31	≤100	≥7.5
N33M	1.14-1.17	11.4-11.7	≥852	≥10.7	≥1114	≥14	247-263	31-33	≤100	≥7.5
N35M	1.17-1.22	11.7-12.2	≥876	≥11.0	≥1114	≥14	263-287	33-36	≤100	≥7.5
N38M	1.22-1.26	12.2-12.6	≥916	≥11.5	≥1114	≥14	287-303	36-38	≤100	≥7.5
N40M	1.26-1.29	12.6-12.9	≥939	≥11.8	≥1114	≥14	303-318	38-40	≤100	≥7.5
N42M	1.29-1.32	12.9-13.2	≥955	≥12.0	≥1114	≥14	318-334	40-42	≤100	≥7.5
N45M	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1114	≥14	334-366	42-46	≤100	≥7.5
N48M	1.36-1.42	13.6-14.2	≥1018	≥12.8	≥1114	≥14	358-390	45-49	≤100	≥7.5
N50M	1.39-1.45	13.9-14.5	≥1050	≥13.2	≥1114	≥14	374-406	47-51	≤100	≥7.5
N30H	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1353	≥17	223-247	28-31	≤120	≥7.5
N33H	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1353	≥17	247-263	31-33	≤120	≥7.5
N35H	1.17-1.22	11.7-12.2	≥875	≥11.0	≥1353	≥17	263-287	33-36	≤120	≥7.5
N38H	1.22-1.26	12.2-12.6	≥916	≥11.6	≥1353	≥17	287-303	36-38	≤120	≥7.5
N40H	1.26-1.29	12.6-12.9	≥939	≥11.8	≥1353	≥17	303-318	38-40	≤120	≥7.5
N42H	1.29-1.32	12.9-13.2	≥955	≥12.0	≥1353	≥17	318-334	40-42	≤120	≥7.5
N45H	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1353	≥17	334-366	42-46	≤120	≥7.5
N48H	1.36-1.42	13.6-14.2	≥1026	≥12.9	≥1273	≥16	358-390	45-49	≤120	≥7.5
N30SH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1592	≥20	223-247	28-31	≤150	≥7.5
N33SH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1592	≥20	247-263	31-33	≤150	≥7.5
N35SH	1.17-1.22	11.7-12.2	≥876	≥11.0	≥1592	≥20	263-287	33-36	≤150	≥7.5
N38SH	1.22-1.26	12.2-12.6	≥899	≥11.3	≥1592	≥20	287-303	36-38	≤150	≥7.5
N40SH	1.26-1.29	12.6-12.9	≥931	≥11.7	≥1592	≥20	303-318	38-40	≤150	≥7.5
N42SH	1.29-1.32	12.9-13.2	≥963	≥12.1	≥1592	≥20	318-334	40-42	≤150	≥7.5
N44SH	1.30-1.36	13.0-13.6	≥995	≥12.3	≥1592	≥20	326-359	41-45	≤150	≥7.5
N30UH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1990	≥25	223-247	28-31	≤180	≥7.5
N33UH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1990	≥25	247-263	31-33	≤180	≥7.5
N35UH	1.17-1.22	11.7-12.2	≥875	≥11.0	≥1990	≥25	263-287	33-36	≤180	≥7.5
N38UH	1.22-1.26	12.2-12.6	≥915	≥11.5	≥1990	≥25	287-302	36-38	≤180	≥7.5
N40UH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1990	≥25	302-334	38-42	≤180	≥7.5
N30EH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥2388	≥30	223-247	28-31	≤200	≥7.5
N33EH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥2388	≥30	247-263	31-33	≤200	≥7.5
N35EH	1.17-1.25	11.7-12.5	≥875	≥11.0	≥2388	≥30	263-295	33-37	≤200	≥7.5
N38EH	1.22-1.29	12.2-12.9	≥907	≥11.4	≥2388	≥30	287-318	36-40	≤200	≥7.5
N30AH	1.08-1.20	10.8-12.0	≥860	≥10.8	≥2626	≥33	2