NdFeB ring magnets are kind of thin round NdFeB magnets with a hole through the center, which also
called NdFeB ring magnet.They feature as a wide application due to its shape and ability to assembly with
many other components which are easy to be found in fields of sience, research, motor, audio etc.

Characteristic

Because of the different outer/inner diameter and thickness, NdFeB Ring magnets can be divided into ring, tube, disc. Three types (Diametral and Axial and Radial) of magnetization direction can be produced according to your design.

Appearance: Smooth and bright surface without burrs.

Advantages: Direct forming can save production cost and production time compared with square grinding/sleeving process.

Grades: N30~N55, N30M~N54M, N30H~N52H, N30SH~N48SH, N25UH~N45UH, N28EH~N40EH, N28AH~N40AH

Size: According to customer's requirement, we can produce regular size and large size (Φ300mm) and micro size (Φ0.5mm).

Magnetization modes: Diametral magnetization and axial magnetization (thickness magnetization) and radial magnetization

Coating: NiCuNi, blue-white Zinc, phosphating/passivation, Epoxy, Teflon, Gold plating, Silver plating, Perrin, Aluminum coating

Application

NdFeB ring magnets is mainly used in all kinds of high-efficiency, energy-saving motors: high-speed motors, high-temperature motors, etc.

Other fields: packaging, bags, safety systems, magnetic separators, magnetic resonance imaging, medical industry, special door locks, filters and filters, sensors, loudspeakers, microphones/ear brushless motors, micro-motors, VCM (voice coil motor), magnetic coupling, magnetic suckers, magnetic tools, etc.

Typical Magnetic Performance for Sintered NdFeB magnet

Grade	Remanence		Coercive Force		Intrinsic Coercive		Max Energy		Max. Working Temp.
	Br		Hcb		Hcj		(BH)max
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m³	MGOe
N35	1.18-1.25	11.8-12.5	≥876	≥11.0	≥955	≥12	263-302	33-38	80 ℃
N38	1.23-1.30	12.3-13.0	≥876	≥11.0	≥955	≥12	286-326	36-41	80 ℃
N40	1.26-1.32	12.6-13.2	≥876	≥11.0	≥955	≥12	302-334	38-42	80 ℃
N42	1.30-1.35	13.0-13.5	≥860	≥10.8	≥955	≥12	318-350	40-44	80 ℃
N45	1.32-1.38	13.2-13.8	≥860	≥10.8	≥955	≥12	334-366	42-46	80 ℃
N48	1.37-1.43	13.7-14.3	≥836	≥10.5	≥875	≥11	358-390	45-49	80 ℃
N50	1.39-1.46	13.9-14.6	≥836	≥10.5	≥875	≥11	374-406	47-51	80 ℃
N52	1.42-1.48	14.2-14.8	≥836	≥10.5	≥875	≥11	390-422	49-53	80 ℃
N54	1.45-1.51	14.5-15.1	≥836	≥10.5	≥875	≥11	406-438	51-55	80 ℃
N35M	1.18-1.25	11.8-12.5	≥876	≥10.5	≥1114	≥14	263-302	33-38	100 ℃
N38M	1.23-1.30	12.3-13.0	≥916	≥11.5	≥1114	≥14	287-326	36-41	100 ℃
N40M	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1114	≥14	302-342	38-43	100 ℃
N42M	1.30-1.35	13.0-13.5	≥955	≥12.0	≥1114	≥14	318-358	40-45	100 ℃
N45M	1.32-1.38	13.2-13.8	≥971	≥12.2	≥1114	≥14	334-374	42-47	100 ℃
N48M	1.37-1.43	13.7-14.3	≥995	≥12.5	≥1114	≥14	358-398	45-50	100 ℃
N50M	1.39-1.46	13.9-14.6	≥995	≥12.5	≥1035	≥13	374-414	47-52	100 ℃
N52M	1.42-1.48	14.2-14.8	≥995	≥12.5	≥1035	≥13	390-422	49-53	100 ℃
N54M	1.45-15.0	14.5-15.0	≥995	≥12.5	≥1035	≥13	406-438	51-55	100 ℃
N33H	1.14-1.17	11.4-11.7	≥836	≥10.5	≥1353	≥17	247-263	31-33	120 ℃
N35H	1.18-1.25	11.8-12.5	≥876	≥11.0	≥1353	≥17	263-302	33-38	120 ℃
N38H	1.23-1.30	12.3-13.0	≥916	≥11.5	≥1353	≥17	287-326	36-41	120 ℃
N40H	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1353	≥17	302-342	38-43	120 ℃
N44H	1.30-1.37	13.0-13.7	≥963	≥12.1	≥1273	≥16	326-366	41-46	120 ℃
N46H	1.34-1.40	13.4-14.0	≥995	≥12.5	≥1273	≥16	342-382	43-48	120 ℃
N48H	1.36-1.42	13.6-14.2	≥1011	≥12.7	≥1273	≥16	358-398	45-50	120 ℃
N50H	1.38-1.44	13.8-14.4	≥1026	≥12.9	≥1273	≥16	374-406	47-51	120 ℃
N52H	1.40-1.46	14.0-14.6	≥1035	≥13.0	≥1273	≥16	382-422	48-53	120 ℃
N33SH	1.14-1.17	11.4-11.7	≥836	≥10.5	≥1592	≥20	247-263	31-33	150 ℃
N35SH	1.18-1.25	11.8-12.5	≥883	≥11.1	≥1592	≥20	263-302	33-38	150 ℃
N38SH	1.23-1.30	12.3-13.0	≥923	≥11.6	≥1592	≥20	287-326	36-41	150 ℃
N40SH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1592	≥20	302-342	38-43	150 ℃
N42SH	1.28-1.34	12.8-13.4	≥955	≥12.0	≥1512	≥19	310-350	39-44	150 ℃
N45SH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1512	≥19	334-374	42-47	150 ℃
N48SH	1.36-1.42	13.6-14.2	≥1011	≥12.7	≥1512	≥19	358-390	45-49	150 ℃
N50SH	1.38-1.44	13.8-14.4	≥1035	≥13.0	≥1512	≥19	372-406	47-51	150 ℃
N28UH	1.07-1.09	10.7-10.9	≥780	≥9.80	≥1990	≥25	211-225	26-28	180 ℃
N30UH	1.09-1.17	10.9-11.7	≥820	≥10.3	≥1990	≥25	223-263	28-33	180 ℃
N33UH	1.14-1.22	11.4-12.2	≥859	≥10.8	≥1990	≥25	247-287	31-36	180 ℃
N35UH	1.18-1.25	11.8-12.5	≥891	≥11.2	≥1990	≥25	263-302	33-38	180 ℃
N38UH	1.22-1.28	12.2-12.8	≥923	≥11.6	≥1990	≥25	287-326	36-41	180 ℃
N40UH	1.26-1.32	12.6-13.2	≥955	≥12.0	≥1990	≥25	302-334	38-42	180 ℃
N42UH	1.29-1.35	12.9-13.5	≥955	≥12.0	≥1990	≥25	318-350	40-44	180 ℃
N45UH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1990	≥25	334-374	42-47	180 ℃
N48UH	1.36-1.41	13.6-14.1	≥1011	≥12.7	≥1911	≥24	358-398	45-50	180 ℃
N28EH	1.07-1.09	10.7-10.9	≥780	≥9.80	≥2388	≥30	211-227	26-28	200 ℃
N30EH	1.09-11.7	10.9-11.7	≥820	≥10.3	≥2388	≥30	223-263	28-33	200 ℃
N33EH	1.14-1.20	11.4-12.0	≥859	≥10.8	≥2388	≥30	247-287	31-36	200 ℃
N35EH	1.17-1.23	11.7-12.3	≥883	≥11.1	≥2388	≥30	263-295	33-37	200 ℃
N38EH	1.22-1.28	12.2-12.8	≥923	≥11.6	≥2388	≥30	287-318	36-40	200 ℃
N40EH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥2388	≥30	302-334	38-42	200 ℃
N44EH	1.30-1.35	13.0-13.5	≥979	≥12.3	≥2308	≥29	326-366	41-46	200 ℃
N28AH	1.05-1.13	10.5-11.3	≥780	≥10.0	≥2786	≥35	207-247	26-31	220 ℃
N30AH	1.09-1.17	10.9-11.7	≥820	≥10.3	≥2786	≥35	223-263	28-33	220 ℃
N35AH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥2786	≥35	263-295	33-37	220 ℃

Surface Treatment

Zinc coating:

Good corrosion resistance

Good salt spray resistance

Nickel coating:

Excellent corrosion resistance

Superior resistance against humidity and heat

Passivation:

Surface clean

Certain protection for uncoated magnets

Epoxy coating:

Excellent corrosion resistance

Superior salt spray resistance

Good resistance against humidity and heat

Name	White Zinc	Color Zinc	Nickel	Electroless Nickel	NiCuNi	NiSn	Epoxy	Phosphating	NiAu
Coating Thickness (μm)	8-15	10-15	20-30	20-30	15-30	20-30	10-30	1-3	10-20
Color	Blue & white	Multicolor	Silver	Silver	Silver	Silver	Black	Black	Gold
PCT	3	3	1	1	2	2	2	3	2
Humidity Test	3	3	1	1	1	1	1	2	2
Salt Spray Test	3	2	3	1	2	2	1	3	2
Collision Test	2	2	1	1	1	1	1	3	1

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Sintered NdFeB Ring Magnet