Product category

Custom Forms

Neodymium Ring Magnet

Description:

Applications of NdFeB Ring-Neodymium Ring magnets are used specifically for loudspeaker systems, hard disk drives, audio equipment such as microphones, acoustic pick-ups, headphones and loudspeakers, Dentures, Magnetically coupled pumps, Door catches, Motors and generators, Jewellery, Bearings.

In speakers, NdFeB magnets are used in the form of a circular disc or a ring-shaped magnet. These magnets have a strong magnetic field, which helps to produce high-quality sound with excellent clarity and precision. The circular disc-shaped magnet is widely used in small to medium-sized speakers, whereas the ring-shaped magnet is suitable for larger speakers with higher power requirements. The advantage of using NdFeB magnets in speakers is that they are lightweight and compact, making them ideal for portable and space-constrained devices. However, the disadvantage is that these magnets are brittle and can crack or break if exposed to high impact or stress.

In car audio systems, NdFeB magnets are used in the form of a rectangular or cylindrical magnet. These magnets are used to provide strong magnetic field and stability for the speaker cone, which is essential for producing quality sound in a noisy environment. The rectangular magnet is used in mid-range and bass speakers, whereas the cylindrical magnet is used in tweeters. The advantage of using NdFeB magnets in car audio systems is that they offer excellent power-to-size ratio and produce high-quality sound with minimal distortion. However, the disadvantage is that they are expensive compared to other types of magnets.

We have in-depth cooperation with world-renowned brands Harman, ASK (car high-end audio), BOSE (top audio factory), Amazon's Guoguang, and Lianchuang Lisheng.

+86-15857968349 mahy@dymagnet.com

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Size Chart
Performance Parameters
Surface Coating
Magnetization Direction

Product Name	Size Type	Machinable Dimensions (Can Be Classified According To Size), With Tolerances
Neodymium Ring Magnet	Inner and Outer Diameter/Concentricity	1、3.00mm≤D/d≤10.0mm，Tolerances±0.03mm
		2、10.0mm<D/d≤25.0mm，Tolerances±0.04mm
		3、25.0mm<D/d≤40.0mm，Tolerances±0.05mm
		4、40.0mm<D/d≤70.0mm，Tolerances±0.10mm

Why choose Sintered Neodymium Ring Magnet

Increased magnetic field density: Ring magnets have a circular shape that provides a more concentrated magnetic field, making them ideal for applications that require a strong magnetic field in a specific direction.
Easy to assemble: Ring magnets can be stacked or placed in a specific orientation to create a more complex magnetic assembly, which makes them suitable for use in multi-magnet systems.
Space-saving: Ring magnets take up less space than other shapes, which makes them ideal for applications where compactness is important.
Improved stability: Ring magnets have a symmetrical shape that provides improved stability compared to other shapes, making them suitable for applications that require stability, such as motors or generators.
Aesthetically pleasing: Ring magnets have a simple and elegant shape that can be appealing for certain applications, such as jewelry or decorative items.

Sintered NdFeB Magnet Inspection Standards
GRADE Performance grade	Residual Magnetic Induction Intensity (Br)		Magnetic Coercivity (HCB)		Intrinsic Coercivity (HCJ)		Maximum Magnetic Energy Product (BH)max		Maximum Operating Temperature Tw L/D = 0.7
	Minimum Value		Minimum Value		Minimum Value		Range		Maximum Operating Temperature Tw L/D = 0.7
	T	kGs	kA/m	kOe	kA/m	kOe	kA/m³	MGOe	°c
N28ZH	1.04	10.4	772	9.7	3184	40	207 ~ 230	26 ~ 29	250
N44AH	1.3	13	971	12.2	2786	35	326~358	41~45	230
N42AH	1.29	12.9	963	12.1	2786	35	318 ~ 342	40 ~ 43	230
N40AH	1.26	12.6	939	11.8	2786	35	302 ~ 326	38 ~ 41	230
N35AH	1.17	11.7	868	10.9	2786	35	263 ~ 287	33 ~ 36	230
N30AH	1.08	10.8	804	10.1	2786	35	223 ~ 247	28 ~ 31	230
N42TH	1.29	12.9	957	11.8	2627	33	318 ~ 342	40 ~ 43	220
N40TH	1.26	12.6	930	11.5	2627	33	302 ~ 326	38 ~ 41	220
N38TH	1.23	12.3	910	11.1	2627	33	287 ~ 310	36 ~ 39	220
N35TH	1.18	11.8	876	11	2786	35	263 ~ 287	33 ~ 36	220
N33TH	1.13	11.3	844	10.6	2786	35	247 ~ 270	31 ~ 33	220
N30TH	1.1	11	796	10	2786	35	223 ~ 247	28 ~ 31	220
N28TH	1.05	10.5	756	9.5	2786	35	207 ~ 230	26 ~ 29	220
N45EH	1.33	13.3	995	12.5	2308	29	342 ~ 366	43 ~ 46	200
N42EH	1.29	12.9	957	11.8	2308	29	318 ~ 342	40 ~ 43	200
N40EH	1.26	12.6	930	11.5	2388	30	302 ~ 326	38 ~ 41	200
N38EH	1.23	12.3	910	11.1	2388	30	287 ~ 310	36 ~ 39	200
N35EH	1.18	11.8	876	11	2388	30	263 ~ 287	33 ~ 36	200
N33EH	1.13	11.3	844	10.6	2388	30	247 ~ 270	31 ~ 33	200
N30EH	1.1	11	796	10	2388	30	223 ~ 247	28 ~ 31	200
N28EH	1.05	10.5	756	9.5	2388	30	207 ~ 230	26 ~ 29	200
N52UH	1.42	14.2	1018	12.8	1911	24	390 ~ 422	49 ~ 53	180
N50UH	1.39	13.9	1018	12.8	1911	24	374 ~ 406	47 ~ 51	180
N48UH	1.37	13.7	1018	12.8	1911	24	358 ~ 390	45 ~ 49	180
N45UH	1.33	13.3	995	12.5	1911	24	342 ~ 366	43 ~ 46	180
N42UH	1.29	12.9	957	11.8	1990	25	318 ~ 342	40 ~ 43	180
N40UH	1.26	12.6	930	11.5	1990	25	302 ~ 326	38 ~ 41	180
N38UH	1.23	12.3	910	11.1	1990	25	287 ~ 310	36 ~ 39	180
N35UH	1.18	11.8	876	11	1990	25	263 ~ 287	33 ~ 36	180
N33UH	1.13	11.3	844	10.6	1990	25	247 ~ 270	31 ~ 33	180
N30UH	1.1	11	796	10	1990	25	223 ~ 247	28 ~ 31	180
N28UH	1.05	10.5	756	9.5	1990	25	207 ~ 230	26 ~ 29	180
N52SH	1.42	14.2	1018	12.8	1512	19	390 ~ 422	49 ~ 53	150
N50SH	1.39	13.9	1018	12.8	1512	19	374 ~ 406	47 ~ 51	150
N48SH	1.37	13.7	1018	12.8	1512	19	358 ~ 390	45 ~ 49	150
N45SH	1.33	13.3	995	12.5	1592	20	342 ~ 366	43 ~ 46	150
N42SH	1.29	12.9	957	11.8	1592	20	318 ~ 342	40 ~ 43	150
N40SH	1.26	12.6	930	11.5	1592	20	302 ~ 326	38 ~ 41	150
N38SH	1.23	12.3	910	11.1	1592	20	287 ~ 310	36 ~ 39	150
N35SH	1.18	11.8	876	11	1592	20	263 ~ 287	33 ~ 36	150
N33SH	1.13	11.3	844	10.6	1592	20	247 ~ 270	31 ~ 33	150
N30SH	1.1	11	796	10	1592	20	223 ~ 247	28 ~ 31	150
N28SH	1.05	10.5	756	9.5	1592	20	207 ~ 230	26 ~ 29	150
N55H	1.45	14.5	1035	13	1274	16	406 ~ 438	51 ~ 55	120
N52H	1.42	14.2	1035	13	1274	16	390 ~ 422	49 ~ 53	120
N50H	1.39	13.9	1035	13	1274	16	374 ~ 406	47 ~ 51	120
N48H	1.37	13.7	1018	12.8	1274	16	358 ~ 390	45 ~ 49	120
N45H	1.33	13.3	995	12.5	1353	17	342 ~ 366	43 ~ 46	120
N42H	1.29	12.9	957	12	1353	17	318 ~ 342	40 ~ 43	120
N40H	1.26	12.6	930	117	1353	17	302 ~ 326	38 ~ 41	120
N38H	1.23	12.3	910	11.4	1353	17	287 ~ 310	36 ~ 39	120
N35H	1.18	11.8	876	11	1353	17	263 ~ 287	36 ~ 39	120
N33H	1.13	11.3	844	10.6	1353	17	247 ~ 270	33 ~ 36	120
N30H	1.1	11	796	10	1353	17	223 ~ 247	31 ~ 33	120
N28H	1.05	10.5	756	9.5	1353	17	207 ~ 230	28 ~ 31	120
N55M	1.45	14.5	995	12.5	1035	13	406 ~ 438	51 ~ 55	100
N52M	1.42	14.2	995	12.5	1035	13	390 ~ 422	49 ~ 53	100
N50M	1.39	13.9	1035	13	1114	14	374 ~ 406	47 ~ 51	100
N48M	1.37	13.7	1012	12.7	1114	14	358 ~ 390	45 ~ 49	100
N45M	1.33	13.3	971	12.2	1114	14	342 ~ 366	43 ~ 46	100
N42M	1.29	12.9	938	11.8	1114	14	318 ~ 342	40 ~ 43	100
N40M	1.26	12.6	910	11.4	1114	14	302 ~ 326	38 ~ 41	100
N38M	1.23	12.3	876	11	1114	14	287 ~ 310	36 ~ 39	100
N35M	1.18	11.8	860	10.8	1114	14	263 ~ 287	33 ~ 36	100
N33M	1.13	11.3	796	10	1114	14	247 ~ 270	31 ~ 33	100
N30M	1.1	11	796	10	1114	14	223 ~ 247	28 ~ 31	100
N28M	1.05	10.5	756	9.5	1114	14	207 ~ 230	26 ~ 29	100
N55	1.45	14.5	836	10.5	875	11	406 ~ 438	51 ~ 55	80
N54	1.45	14.4	836	10.5	876	11	406 ~ 430	51 ~ 54	80
N52	1.42	14.2	860	10.8	960	12	390 ~ 422	49 ~ 53	80
N50	1.39	13.9	860	10.8	960	12	374 ~ 406	47 ~ 51	80
N48	1.37	13.7	860	10.8	960	12	358 ~ 390	45 ~ 49	80
N45	1.33	13.3	836	10.5	960	12	342 ~ 366	43 ~ 46	80
N42	1.29	12.9	836	10.5	960	12	318 ~ 342	40 ~ 43	80
N40	1.26	12.6	836	10.5	960	12	302 ~ 326	38 ~ 41	80
N38	1.23	12.3	836	10.5	960	12	287 ~ 310	36 ~ 39	80
N35	1.18	11.8	836	10.5	960	12	263 ~ 287	33 ~ 36	80
N33	1.13	11.3	796	10	960	12	247 ~ 270	31 ~ 34	80
N30	1.08	10.8	804	10.1	876	11	223 ~ 255	28 ~ 32	60
N30C	1.08	10.8	804	10.1	716	9	223 ~ 255	28 ~ 32	60
N28	1.04	10.4	772	9.7	557	7	207 ~ 230	28 ~ 31	60

Type Of Coating		Thickness	Exterior	Corrosion Resistance					Remark
Type Of Coating		Thickness	Exterior	PCT	Salt Spray	Humidity and Temperature	Acid/Alkali	Oil	Remark
Zn(White Zn)	√	≥5μm	Blue white	——	★★	★★★	——	★
Zn(Color-plated Zn)	√	≥5μm	Iridescent	——	★★★	★★★★	——	★
Ni+Cu+Ni	√	≥15μm	Silver White	★★★	★★★★	★★★★★	★★★	★★★
Ni+Cu+Ni+Sn		≥15μm	Silver White	★★★★	★★★★	★★★★★	——	——	Excellent Eelding Performance
Chemic Ni	√	≥5μm	Silver White	★★★★	★★★★★	★★★★★	★★★	★★★
Epoxy	√	≥12μm	Black or Gray	★★★	★★★★★	★★★★★	★★★★★	★★★★	Poor Wear Resistance
Passivated	√	≤2μm	Black or Gray	——	——	★★★	——	★★★
Al		≥3μm	Silver Gray	★★★★	★★★	★★★★	——	★★★	High Binding Force
Al+Epoxy		≥15μm	Black or Gray	★★★★★	★★★★★	★★★★★	★★★★★	★★★★★	Poor Wear Resistance
Zn+Al		≥10μm	Silver White or Silver Gray	★★★★★	★★★★★	★★★★★	——	★★★★★
Everluber		≥5μm	Golden	★★★★	★★★★	★★★★★	★★★★★	★★★★
Teflon		≥5μm	Black	★★	★★★	★★★★★	★★★★★	★★★	Good Wear Resistance


Disc Axial	Disc Diametrical	Cylinder Axial	Cylinder Diametrical

Ring Axial	Ring Diametrical	Ring Cylinder Axial	Ring Cylinder Diametrical

Block-Rectangle Thickness	Block-Rectangle Length

Arc Width	Arc Height	Arc Diametrical	Arc Diametrical

Related products

Sintered NdFeB Permanent Magnetic Materials

Zhejiang Zhongke Magnetic Industry Co., Ltd is leading Neodymium Ring Magnet manufacturers and suppliers in China, The company's current production process of sintered NdFeB permanent magnet materials can be divided into two parts: the blank process (also known as the "front process" in the industry) and the finished product process (also known as the "post process" in the industry): the blank process is the praseodymium Neodymium metal, pure iron, ferroboron and other raw materials are used to make NdFeB blanks; the finished product process is to process NdFeB blanks by mechanical processing and surface treatment to obtain NdFeB magnets. We also OEM/ODM custom sintered NdFeB ring magnet. The specific production process flow chart is as follows:

Raw Material Ratio

Mix solid raw materials such as praseodymium and neodymium metals, pure iron, and ferroboron in proportion.
Smelting

The mixed raw materials are smelted through the smelting furnace, and then the quick-setting thin strip alloy sheet is formed by stripping.
Crushing Powder

The rapid-setting thin strip alloy flakes are crushed into coarse alloy powder through the secondary crushing furnace, and then fine alloy powder is made into alloy powder through jet milling.
Press Molding

Under the protection of nitrogen, the powder is made into a compact by pressing.
Vacuum Sinter

The compact is heated to a high temperature in a sintering furnace in a vacuum environment and then subjected to aging heat treatment to form a NdFeB blank.
Mechanical Processing

Use professional equipment to process the blank according to the specific requirements of the order for shape and size, including grinding, wire cutting, slicing, punching, etc.
Diffusion Of Grain Boundaries

Cover the surface of the magnet with heavy rare earth metal or compound, and diffuse the heavy rare earth element into the interior of the sintered NdFeB magnet by heating
Surface Treatment

In order to meet the performance requirements of wear resistance and corrosion resistance, mechanical grinding and electrochemical treatment are carried out on the surface of the magnet.
Magnetizing

According to the needs of the order, magnetize the magnet in the magnetic field using a magnetizer.
Inspection and Packaging

According to the requirements of the order, the magnetic properties, appearance, size, corrosion resistance and other properties of the magnets are inspected, and the packaging and storage can only be carried out after passing the inspection.

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Production Advantages

Zhongke is committed to becoming a world-renowned supplier of permanent magnet material application solutions in the field of new generation consumer electronics and energy-saving home appliances. Welcome to visit our NdFeB ring magnet factory in China.

Milling Process

The company applies technologies such as casting columnar crystal growth control technology, grain refinement and micro-optimization technology, etc., and is committed to improving the consistency of powder and giving full play to the performance potential of rare earth. By improving the smelting microstructure, applying fine-grain technology, and optimizing the mixing process, etc., significantly improving the performance of NdFeB magnets.
Forming And Sintering Process

The company has applied and improved low-oxygen magnet preparation technology and cold isostatic pressing technology, so that NdFeB magnets are in a low-oxygen state during the pressing process, and the preparation of molding blanks is continuously optimized, which effectively reduces the loss of rare earth. The application of low-temperature sintering heat treatment technology has further improved the sintering process. Adjusting the temperature to a suitable state can give full play to the performance of the formula. The representative products are high-performance N55 magnets prepared by low-oxygen technology and N38UH magnets produced by near-net molding technology.
Processing Technology

In order to pursue the accurate precision of customer customization, the company applies high-performance ultra-thin small special-shaped permanent magnet preparation technology to carry out high-efficiency and low-loss precision machining of NdFeB blanks, breaking through the technical bottleneck of high-performance thin and small magnet processing difficulty, and Strictly control product appearance defects through intelligent image appearance automatic inspection technology to improve inspection efficiency and accuracy.

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NdFeB Ring Magnets Suppliers

Product category

Custom Forms

Neodymium Ring Magnet

Description:

Related products

Sintered NdFeB Permanent Magnetic Materials

Raw Material Ratio

Smelting

Crushing Powder

Press Molding

Vacuum Sinter

Mechanical Processing

Diffusion Of Grain Boundaries

Surface Treatment

Magnetizing

Inspection and Packaging

Production Advantages

Milling Process

Forming And Sintering Process

Processing Technology

Certificate

News and Event

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