Ring magnet

Neodymium (Neo or NdFeB) magnets are permanent magnets, and part of the rare-earth magnet family.
Neo magnets have the highest magnetic properties and are the most powerful commercially available magnets today. Because of their magnetic strength, neodymium ring magnets are the preferred choice for many consumer, commercial and technical applications.
Neo ring magnets are being designed into a new generation of motors, generators, hydraulic cylinders, pumps & sensors. They also remain popular in high-end loudspeakers & high-intensity separators.

Popular Grade: N33,N35,N38.N42,N45,N50,N52 N35SH/N38SH/N42SH N30UH/N35UH/N38UH/N40UG 35H/38H/40H/42H/45H/48H
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PRODUCT DESCRIPTION

Size Chart
Surface protection
Magnetic performance table
Product sketch

Ring Shape	Achievable Sizes Range（mm）			Size(mm)	Machining Accuracy
	OD	ID	T	Size(mm)	Tolerance	∥	⊥	⊙
	2<OD<=180	1<ID<=100	1<T<=60	OD/ID<=10	±0.03	0.05	0.1	0.05
				10<OD/ID<=30	±0.05	0.1	0.1	0.05
				30<OD/ID<=60	±0.05	0.1	0.1	0.1-0.3
				60<OD/ID<=100	±0.1	0.2	0.3	0.1-0.3
				100<OD/ID<=180	±0.15	0.2	0.5	0.5

Item	Grade	Remanence;Br				Coercive Force;bHc		Intrisic Coercive Force;iHc		Max Energy Product;（BH）max				Working Temp. ℃
		kGs		T		kOe	KA/m	kOe	KA/m	MGOe		KJ/m3
		Max.	Min.	Max.	Min.	kOe	KA/m	kOe	KA/m	Max.	Min.	Max.	Min.
N	N54	15.0	14.5	1.50	1.45	≥10.5	≥836	≥11	≥876	55	51	438	406	≤80
	N52	14.8	14.2	1.48	1.42	≥10.5	≥836	≥11	≥876	53	49	422	390	≤80
	N50	14.5	14.0	1.45	1.40	≥10.5	≥836	≥11	≥876	51	47	406	374	≤80
	N48	14.3	13.8	1.43	1.38	≥11.0	≥876	≥12	≥955	49	45	390	358	≤80
	N45	13.8	13.2	1.38	1.32	≥11.0	≥876	≥12	≥955	46	43	366	342	≤80
	N42	13.2	12.8	1.32	1.28	≥11.0	≥876	≥12	≥955	43	40	342	318	≤80
	N40	12.8	12.5	1.28	1.25	≥11.0	≥876	≥12	≥955	41	38	326	302	≤80
	N38	12.5	12.2	1.25	1.22	≥11.0	≥876	≥12	≥955	39	36	310	287	≤80
	N35	12.2	11.7	1.22	1.17	≥10.9	≥868	≥12	≥955	36	33	287	263	≤80
	N33	11.7	11.3	1.17	1.13	≥10.5	≥836	≥12	≥955	34	31	271	247	≤80
	N30	11.3	10.8	1.13	1.08	≥10.0	≥796	≥12	≥955	31	28	247	223	≤80
M	N52M	14.8	14.2	1.48	1.42	≥13.1	≥1043	≥14	≥1114	53	49	422	390	≤100
	N50M	14.5	14.0	1.45	1.40	≥13	≥1035	≥14	≥1114	51	47	406	374	≤100
	N48M	14.2	13.7	1.42	1.37	≥12.7	≥1012	≥14	≥1114	49	45	390	358	≤100
	N45M	13.7	13.2	1.37	1.32	≥12.2	≥971	≥14	≥1114	46	43	366	342	≤100
	N42M	13.2	12.8	1.32	1.28	≥11.8	≥938	≥14	≥1114	43	40	342	318	≤100
	N40M	12.8	12.5	1.28	1.25	≥11.4	≥910	≥14	≥1114	41	38	326	302	≤100
	N38M	12.5	12.2	1.25	1.22	≥11	≥876	≥14	≥1114	39	36	310	287	≤100
	N35M	12.2	11.7	1.22	1.17	≥10.8	≥860	≥14	≥1114	36	33	287	263	≤100
Item	Grade	Remanence;Br				Coercive Force;bHc		Intrisic Coercive Force;iHc		Max Energy Product;（BH）max				Working Temp. ℃
		kGs		T		kOe	KA/m	kOe	KA/m	MGOe		KJ/m3
		Max.	Min.	Max.	Min.	kOe	KA/m	kOe	KA/m	Max.	Min.	Max.	Min.
H	N50H	14.5	14.0	1.45	1.40	≥13	≥1035	≥16	≥1274	51	47	406	374	≤120
	N48H	14.3	13.7	1.43	1.37	≥12.8	≥1018	≥17	≥1353	49	45	390	358	≤120
	N45H	13.7	13.2	1.37	1.32	≥12.5	≥995	≥17	≥1353	46	43	366	342	≤120
	N42H	13.2	12.8	1.32	1.28	≥12	≥955	≥17	≥1353	43	40	342	318	≤120
	N40H	12.8	12.5	1.28	1.25	≥11.7	≥930	≥17	≥1353	41	38	326	302	≤120
	N38H	12.5	12.2	1.25	1.22	≥11.4	≥910	≥17	≥1353	39	36	310	287	≤120
	N35H	12.2	11.7	1.22	1.17	≥11.0	≥876	≥17	≥1353	36	33	287	263	≤120
	N33H	11.7	11.3	1.17	1.13	≥10.6	≥844	≥17	≥1353	34	31	271	247	≤120
SH	N50SH	14.4	13.9	1.44	1.39	≥13	≥1035	≥19	≥1512	51	47	406	374	≤150
	N48SH	14.0	13.6	1.40	1.36	≥12.8	≥1018	≥19	≥1512	49	45	390	358	≤150
	N45SH	13.6	13.2	1.36	1.32	≥12.5	≥995	≥20	≥1592	46	43	366	342	≤150
	N42SH	13.2	12.8	1.32	1.28	≥12	≥955	≥20	≥1592	43	40	342	318	≤150
	N40SH	12.8	12.5	1.28	1.25	≥11.5	≥912	≥20	≥1592	41	38	326	302	≤150
	N38SH	12.5	12.2	1.25	1.22	≥11.1	≥886	≥20	≥1592	39	36	310	287	≤150
	N35SH	12.2	11.7	1.22	1.17	≥11.0	≥876	≥20	≥1592	36	33	287	263	≤150
	N33SH	11.7	11.3	1.17	1.13	≥10.5	≥836	≥20	≥1592	34	31	271	247	≤150
UH	N45UH	13.6	13.2	1.36	1.32	≥12.2	≥976	≥24	≥1910	46	43	366	342	≤180
	N42UH	13.2	12.8	1.32	1.28	≥11.8	≥938	≥25	≥1990	43	40	342	318	≤180
	N40UH	12.8	12.5	1.28	1.25	≥11.5	≥912	≥25	≥1990	41	38	326	302	≤180
	Grade	Remanence;Br				Coercive Force;bHc		Intrisic Coercive Force;iHc		Max Energy Product;（BH）max				Working Temp. ℃
		kGs		T		kOe	KA/m	kOe	KA/m	MGOe		KJ/m3
		Max.	Min.	Max.	Min.	kOe	KA/m	kOe	KA/m	Max.	Min.	Max.	Min.
	N38UH	12.5	12.2	1.25	a1.22	≥11.1	≥886	≥25	≥1990	39	36	310	287	≤180
	N35UH	12.2	11.7	1.22	1.17	≥10.6	≥845	≥25	≥1990	36	33	287	263	≤180
	N33UH	11.7	11.3	1.17	1.13	≥10.3	≥816	≥25	≥1990	34	31	271	247	≤180
	N30UH	11.3	10.8	1.13	1.08	≥9.5	≥756	≥25	≥1990	31	28	247	223	≤180
EH	N42EH	13.2	12.8	1.32	1.28	≥12.2	≥971	≥29	≥2308	43	39	342	310	≤200
	N40EH	12.8	12.5	1.28	1.25	≥11.9	≥947	≥30	≥2388	41	37	326	295	≤200
	N38EH	12.5	12.2	1.25	1.22	≥11.6	≥923	≥30	≥2388	39	35	310	279	≤200
	N35EH	12.2	11.7	1.22	1.17	≥11.1	≥883	≥30	≥2388	36	33	287	263	≤200
	N33EH	11.7	11.3	1.17	1.13	≥10.3	≥816	≥30	≥2388	34	31	271	247	≤200
	N30EH	11.3	10.8	1.13	1.08	≥9.5	≥756	≥30	≥2388	31	28	247	223	≤200
	N28EH	10.8	10.4	1.08	1.04	≥9.5	≥756	≥30	≥2388	29	26	231	207	≤200
AH	N35AH	12.2	11.7	1.22	1.17	≥10.6	≥845	≥35	≥2786	36	33	287	263	≤230
	N33AH	11.7	11.3	1.17	1.13	≥10.2	≥816	≥35	≥2786	34	31	271	247	≤230
	N30AH	11.3	10.8	1.13	1.08	≥10.1	≥804	≥35	≥2786	31	28	247	223	≤230
	N28AH	10.8	10.4	1.08	1.04	≥9.5	≥756	≥35	≥2786	29	26	231	207	≤230

Place of Origin:Zhejiang, China
Brand Name:kkmag
Model Number:N35-N54
Type:Permanent
Composite:Neodymium Magnet
Shape:Ring, Ring
Application:Industrial Magnet
Tolerance:±10%
Processing Service:Bending, Welding, Decoiling, Cutting, Punching, Moulding
Grade:Neodymium-Iron-Boron, N48
Product Name:Small Square magnet
Material:Neodymium-Iron-Boron
Coating:Ni, Zn, Ni-Cu-Ni, Epoxy, Gold, Silver, phosphate, passivation
Price Advantage:Competitive and fit price
Packing Details:According to your requirements

Ningbo Cocomag Magnet Industry Co., Ltd.
was set up in 2006.

Established in 2006, Ningbo Cocomag Magnet Industry Co., Ltd. is a professional Neodymium magnet high-tech enterprise, Our company commits to the R&D, production and application of ring neodymium magnets. Our production site, with an area of 30000㎡, is located in Ningbo City, Zhejiang Province, China.Capabilities

30,000㎡

Plant area
200

Company staff
10+

Research personnel
2000tons

High-grade magnet

Certificates of patent

Latest News

What Are the Advantages of Using N30UH and N35UH Round Magnets in High-Temperature Environments?

When designing high-performance systems and devices, particularly in industries such as automotive, aerospace, and industrial machinery, one of the most critical components is the ...
Why Choose N50 or N52 Magnets for High-End Consumer Electronics Applications?

N50 and N52 magnets are two of the highest grades of neodymium magnets, possessing exceptional magnetic properties. Their remanence, which refers to the strength of the magnetic fi...
How Does the Strength of N45 and N50 Magnets Affect Automotive Performance?

The strength of neodymium magnets plays a vital role in numerous automotive applications, especially in electric vehicles (EVs), hybrid vehicles, and various vehicle systems. Magne...
What Are the Differences Between N35, N42, and N52 Grade Square Magnets?

Square magnets made from neodymium are among the strongest and most versatile types of permanent magnets available. They are classified into various grades, such as N35, N42, and N...

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Relevant Knowledge Extension

A ring magnet, also known as a donut magnet or annular magnet, is a type of magnet that has a circular shape with a hole in the middle. This shape allows for the magnet to be easily mounted on a shaft or bolt, making it useful in a variety of applications, such as in motors and generators.

The magnetic field of a ring magnet is typically strongest at the edges of the ring, with a weaker field in the middle where the hole is located. This makes it useful for applications where a strong, focused magnetic field is needed, such as in magnetic couplings, where a ring magnet is used to transfer torque between two rotating components without any physical contact.

Ring magnets can be made from a variety of materials, including ceramic, neodymium, and samarium cobalt. The strength of the magnet depends on its material, size, and shape, as well as the strength of the magnetic field it generates.

Ring magnets can be used in a range of applications, including in speakers, magnetic bearings, and particle accelerators. They are also commonly used in magnetic separators, where they can be used to separate ferromagnetic materials from non-ferromagnetic materials.

Coating Type	Color	Coating Thickness (µm)	SST （h）
Cr3⁺+Zn	White-Blue	4~10	12-24
Cr3⁺+CZn	Light multicolored	4~10	>24
Phosphating	Grey	/	4-8
NiCuNi	Silver	10~30	>24
Black Ni	Metallic black	10~30	>24
Ni+Sn	White Silver	10~30	>48
Ni+Ag	White Silver	10~30	>48
Ni+Au	Gold	10~30	>48
Black Epoxy	Black	10~30	>24
White Epoxy	White	10~30	>48
NiCu+Epoxy	Black	20~40	>48
Ni+Epoxy	Black	20~40	>48

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Ring Neodymium Magnets Manufacturers

PRODUCTS

PDF Download

Exhibition

Ring magnet

PRODUCT DESCRIPTION

Ningbo Cocomag Magnet Industry Co., Ltd.
was set up in 2006.

30,000㎡

200

10+

2000tons

Certificates of patent

Latest News

What Are the Advantages of Using N30UH and N35UH Round Magnets in High-Temperature Environments?

Why Choose N50 or N52 Magnets for High-End Consumer Electronics Applications?

How Does the Strength of N45 and N50 Magnets Affect Automotive Performance?

What Are the Differences Between N35, N42, and N52 Grade Square Magnets?

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Relevant Knowledge Extension

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Ring Neodymium Magnets Manufacturers

PRODUCTS

PDF Download

Exhibition

Ring magnet

PRODUCT DESCRIPTION

Ningbo Cocomag Magnet Industry Co., Ltd.was set up in 2006.

30,000㎡

200

10+

2000tons

Certificates of patent

Latest News

Recommended Products:

Your contact details

Relevant Knowledge Extension

Ningbo Cocomag Magnet Industry Co., Ltd.
was set up in 2006.