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  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details
  • Neodymium Ring Magnet details

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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  • 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.

  • Characteristics Of Sintered NdFeB Magnet Under 23 ℃+/-2℃
    Performance Remanence Induction Intensity (Br) Magnetic Coercive Force (Hcb) Intrinsic Coercivity (Hcj) Maximum Energy Product
    (BH)max    		 Maximum Working Temperature
    Tw L/D = 0.7
    Grade Min Min Min Range
    T kGs kA/m kOe kA/m kOe kA/m³ MGOe °c
    N28ZH 1.04 10.4 772 9.7 3184 40 207~239 26~30 250
    N44AH 1.30 13.0 971 12.2 2786 35 326~358 41~45 230
    N42AH 1.29 12.9 963 12.1 2786 35 318~350 40~44 230
    N40AH 1.26 12.6 939 11.8 2786 35 302~334 38~42 230
    N35AH 1.17 11.7 868 10.9 2786 35 263~295 33~37 230
    N30AH 1.08 10.8 804 10.1 2786 35 223~255 28~32 230
    N42TH 1.29 12.9 957 11.8 2627 33 318 ~ 342 43 ~ 46 220
    N40TH 1.26 12.6 930 11.5 2627 33 302 ~ 326 40 ~ 43 220
    N38TH 1.23 12.3 910 11.1 2627 33 287 ~ 310 38 ~ 41 220
    N35TH 1.18 11.8 876 11 2786 35 263 ~ 287 36 ~ 39 220
    N33TH 1.13 11.3 844 10.6 2786 35 247 ~ 270 33 ~ 36 220
    N30TH 1.1 11 796 10 2786 35 223 ~ 247 31 ~ 33 220
    N28TH 1.05 10.5 756 9.5 2786 35 207 ~ 230 25 ~ 29 220
    N45EH 1.33 13.3 995 12.5 2308 29 342 ~ 366 45 ~ 49 200
    N42EH 1.29 12.9 957 11.8 2308 29 318 ~ 342 43 ~ 46 200
    N40EH 1.26 12.6 930 11.5 2388 30 302 ~ 326 40 ~ 43 200
    N38EH 1.23 12.3 910 11.1 2388 30 287 ~ 310 38 ~ 41 200
    N35EH 1.18 11.8 876 11 2388 30 263 ~ 287 36 ~ 39 200
    N33EH 1.13 11.3 844 10.6 2388 30 247 ~ 270 33 ~ 36 200
    N30EH 1.1 11 796 10 2388 30 223 ~ 247 31 ~ 33 200
    N28EH 1.05 10.5 756 9.5 2388 30 207 ~ 230 25 ~ 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 45 ~ 49 180
    N42UH 1.29 12.9 957 11.8 1990 25 318 ~ 342 43 ~ 46 180
    N40UH 1.26 12.6 930 11.5 1990 25 302 ~ 326 40 ~ 43 180
    N38UH 1.23 12.3 910 11.1 1990 25 287 ~ 310 38 ~ 41 180
    N35UH 1.18 11.8 876 11 1990 25 263 ~ 287 36 ~ 39 180
    N33UH 1.13 11.3 844 10.6 1990 25 247 ~ 270 33 ~ 36 180
    N30UH 1.1 11 796 10 1990 25 223 ~ 247 31 ~ 33 180
    N28UH 1.05 10.5 756 9.5 1990 25 207 ~ 230 28 ~ 31 180
    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 45 ~ 49 150
    N42SH 1.29 12.9 957 11.8 1592 20 318 ~ 342 43 ~ 46 150
    N40SH 1.26 12.6 930 11.5 1592 20 302 ~ 326 40 ~ 43 150
    N38SH 1.23 12.3 910 11.1 1592 20 287 ~ 310 38 ~ 41 150
    N35SH 1.18 11.8 876 11 1592 20 263 ~ 287 36 ~ 39 150
    N33SH 1.13 11.3 844 10.6 1592 20 247 ~ 270 33 ~ 36 150
    N30SH 1.1 11 796 10 1592 20 223 ~ 247 31 ~ 33 150
    N28SH 1.05 10.5 756 9.5 1592 20 207 ~ 230 28 ~ 31 150
    N55H 1.45 14.5 1035 13 1274 16 406 ~ 438 53 ~ 56 120
    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 45 ~ 49 120
    N42H 1.29 12.9 957 12 1353 17 318 ~ 342 43 ~ 46 120
    N40H 1.26 12.6 930 117 1353 17 302 ~ 326 40 ~ 43 120
    N38H 1.23 12.3 910 11.4 1353 17 287 ~ 310 38 ~ 41 120
    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 14.5 836 10.5 876 11 406 ~ 438 51 ~ 55 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 7 207~239 26~30 60
  • Type Of Coating Thickness Exterior Corrosion Resistance Remark
    PCT Salt Spray Humidity and Temperature Acid/Alkali Oil
    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

    Raw Material Ratio

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

  • Smelting

    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

    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

    Press Molding

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

  • Vacuum Sinter

    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

    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

    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

    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

    Magnetizing

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

  • Inspection and Packaging

    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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