Chongqing Great Wall Technology Co., Ltd. is one of the leading manufacturers and suppliers of neodymium disc magnets in China, also supports customized service. Welcome to wholesale high quality neodymium disc magnets for sale here from our factory.

Neodymium Magnets, also known as NdFeB, NIB, or Neo magnets, are the most widely-used type of rare-earth magnets. It is the strongest type of permanent magnet made from an alloy of Neodymium, Iron, and Boron with the Nd2Fe14B tetragonal crystalline structure.

Neodymium magnets are very strong in comparison to their mass, but are also mechanically fragile and the most powerful grades lose their magnetism at temperatures above 80 degrees Celsius (176 degrees Fahrenheit). High-temperature grades will operate at up to 200 and even 230 °C but their strength is only marginally greater than that of samarium-cobalt.

Neodymium disc magnets have become a preferred solution for a wide variety of industrial and civil applications. Neodymium disc magnet is typically measured by the diameter and thickness, then its thickness is always smaller than the diameter. The great majority of Neodymium disc magnet are axially magnetized and widely served various types of application, such as holding purpose and speaker magnet. Diametrically magnetized pattern is also available for circular magnet and most of diametrically magnetized Neodymium disc magnet are used as the sensor magnet. Production efficiency of Neodymium disc magnet has gained a remarkable development with the widely application of multi-wire sawing.

The Manufacturing Process of Sintered NdFeB Magnets

001-Process Flow

Dimensions and Tolerances

002-Dimensions

Outer diameter(mm)	Tolerance(mm)	Cylindricity(mm)
D≤10	±0.03	0.03
10<D≤30	±0.04	0.03
30<D≤50	±0.05	0.05
D>50	±0.06	0.06

Applications

Neodymium disc magnets are also used in thousands of assemblies and products. These high performance magnets can be easily fixed into position using adhesive or pushed into holes and grooves in wood or plastic. Neodymium disc magnets are commonly found in point of sale display units, stationery folders, scale models and industrial applications. Neodymium disc magnets are truly versatile and are used as widely in homemade arts and crafts as they are in high-end technology and engineering applications. Neodymium magnets attract each other with almost twice the force that they use to attract steel objects. They also attract each other through very large distances, even small magnets will attract each other through the thickness of your finger.

Magnetization of Neodymium Disc Magnet

003-Magnetization of Neodymium Disc Magnet

Magnetic Properties

Item	Grade	Br		Hcb		HcJ		(BH)max		Working Temperature
Item	Grade	kGs	T	kA/m	kOe	kA/m	kOe	MGOe	kJ/m³	L/D≥0.7(℃)
N	N35	11.7-12.2	1.17-1.22	≥10.9	≥868	≥12	≥955	33-36	263-287	≤80
	N38	12.2-12.5	1.22-1.25	≥11.3	≥899	≥12	≥960	36-39	287-310
	N40	12.5-12.8	1.25-1.28	≥11.4	≥907	≥12	≥960	38-41	302-326
	N42	12.8-13.2	1.28-1.32	≥11.5	≥915	≥12	≥960	40-43	318-342
	N45	13.2-13.8	1.32-1.38	≥11.6	≥923	≥12	≥960	43-46	342-366
	N48	13.8-14.2	1.38-1.42	≥11.6	≥923	≥12	≥960	46-49	366-390
	N50	14.0-14.5	1.40-1.45	≥12.0	≥955	≥12	≥960	48-51	382-406
	N52	14.3-14.6	1.43-1.46	≥11.0	≥876	≥12	≥960	50-53	398-422
	N55	14.5-15.0	1.45-1.50	≥11.0	≥876	≥12	≥960	53-55	422-438
M	35M	11.7-12.2	1.17-1.22	≥10.9	≥868	≥14	≥1114	33-36	263-287	≤100
	38M	12.2-12.5	1.22-1.25	≥11.3	≥899	≥14	≥1114	36-39	287-310
	40M	12.5-12.8	1.25-1.28	≥11.6	≥923	≥14	≥1114	38-41	302-326
	42M	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	40-43	318-342
	45M	13.2-13.8	1.32-1.38	≥12.5	≥995	≥14	≥1114	43-46	342-366
	48M	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥14	≥1114	46-49	366-390
	50M	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥14	≥1114	48-51	382-406
	52M	14.3-14.6	1.43-1.46	≥13.1	≥1043	≥14	≥1114	50-53	398-422
	54M	14.5-15.0	1.45-1.50	≥13.2	≥1051	≥14	≥1114	52-55	414-438
H	35H	11.7-12.2	1.17-1.22	≥10.9	≥868	≥17	≥1353	33-36	263-287	≤120
	38H	12.2-12.5	1.22-1.25	≥11.3	≥899	≥17	≥1353	36-39	287-310
	40H	12.5-12.8	1.25-1.28	≥11.6	≥923	≥17	≥1353	38-41	302-326
	42H	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	40-43	318-342
	45H	13.2-13.8	1.32-1.38	≥12.3	≥973	≥17	≥1353	43-46	342-366
	48H	13.7-14.2	1.37-1.42	≥12.5	≥995	≥17	≥1353	46-49	366-390
	50H	14.0-14.5	1.40-1.45	≥12.6	≥1003	≥17	≥1353	48-51	382-406
	52H	14.3-14.8	1.43-1.48	≥13.1	≥1043	≥17	≥1353	50-53	398-422
SH	35SH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥20	≥1592	33-36	263-287	≤150
	38SH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥20	≥1592	36-39	287-310
	40SH	12.5-12.8	1.25-1.28	≥11.8	≥939	≥20	≥1592	38-41	302-326
	42SH	12.8-13.2	1.28-1.32	≥12.1	≥963	≥20	≥1592	40-43	318-342
	45SH	13.2-13.8	1.32-1.38	≥12.3	≥979	≥20	≥1592	43-46	342-366
	48SH	13.7-14.3	1.37-1.43	≥12.7	≥1011	≥20	≥1592	46-49	366-390
	50SH	14.0-14.5	1.40-1.45	≥12.6	≥1003	≥20	≥1592	48-51	382-406
UH	28UH	10.4-10.8	1.04-1.08	≥9.6	≥764	≥25	≥1990	26-29	207-231	≤180
	30UH	10.8-11.3	10.8-1.13	≥10.2	≥812	≥25	≥1990	28-31	223-247
	33UH	11.3-11.7	1.13-1.17	≥10.7	≥852	≥25	≥1990	31-34	247-271
	35UH	11.7-12.2	1.17-1.22	≥10.8	≥860	≥25	≥1990	33-36	263-287
	38UH	12.2-12.5	1.22-1.25	≥11.3	≥899	≥25	≥1990	36-39	287-310
	40UH	12.5-12.8	1.25-1.28	≥11.8	≥939	≥25	≥1990	38-41	302-326
	42UH	12.8-13.2	1.28-1.32	≥12.1	≥963	≥25	≥1990	40-43	318-342
	45UH	13.2-13.8	1.32-1.38	≥12.3	≥979	≥25	≥1990	43-46	342-366
	48UH	13.7-14.3	1.37-1.43	≥12.7	≥1011	≥25	≥1990	46-49	366-390
EH	28EH	10.4-10.8	1.04-1.08	≥9.8	≥780	≥30	≥2388	26-29	207-231	≤200
	30EH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥30	≥2388	28-31	223-247
	33EH	11.3-11.7	1.13-1.17	≥10.5	≥836	≥30	≥2388	31-34	247-271

Surface Treatment

Surface	Coating	Thickness(μm)	Color	SST(Hrs)	Characteristic
Zinc	Zn	4-10	Blue White	24-48	Regular Protection
Zinc	Colored Zn	4-10	Colorful	48-72	Excellent against Humidity
Nickel	Ni-Ni	8-15	Silver	48-96	Regular Protection
Nickel	NiCuNi	10-20	Silver	24-72	Excellent against Humidity
Epoxy	Ni-Cu-Epoxy	10-20	Black/Grey	72-108	Excellent against Humidity
	Ni-Cu-Ni-Epoxy	10-30		72-108	Excellent against Humidity
	Epoxy	10-30		>500	Excellent against Humidity
Teflon	Teflon	10-20	Black	48-72	Excellent against Humidity, Superior againt solvents, gases, fungi and bacterial.
Passivation	Phosphated/Passivated	≤2	Dark Grey	≤2.5	Temperary Protection
Gold	Ni-Cu-Ni-Au	10-20	Golden	>12	Regular Protection
Everlube	Everlube	10-25	Yellow	>48	Non-conducting, excellent adhesion
Everlube	Ni-Cu-Everlube	10-25	Yellow	>96	Excellent adhesion
PVD Aluminum	PVD Aluminum	5-30	Silver	>72	Excellent adhesion strength>15mPa
Parylene	Parylene	5-15	Grey	>48	Excellent against Humidity, Superior againt solvents, gases, fungi and bacterial.

Note: Salt Spray Condition:
Concentration of Sodium Chloride	5%
Test Temperature:	35°C
Temperature of Pressure Barrel:	47°C
Relative Humidity of Laboratory:	85%
Spraying Volume:	1.5±0.5ml/(h.80cm³)

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