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NdFeB Magnets With Countersunk Hole Suppliers

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  • Neodymium Countersunk Magnet
  • Neodymium Countersunk Magnet details

Neodymium Countersunk Magnet

Description:

Neodymium countersunk magnets are a functional type of permanent magnets. These magnets have a countersunk hole, so it's easy to fix onto surface by using a matching screw. Because of their magnetic strength, neodymium countersunk magnets are the preferred choice for many consumer, commercial and technical applications.

Zhongke is specialized in manufacturing and providing neodymium cylinder magnets applied in various industrial applications with advanced technology, rich experience, and professional engineering technicians.

+86-15857968349 mahy@dymagnet.com
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  • Product Name Size Type Machinable Dimensions (Can Be Classified According To Size), With Tolerances
    Neodymium Countersunk Magnet L/W
    1、0.2mm<L/W≤5.00mm，Tolerances±0.02mm
    3、20.0mm<L/W≤85.0mm，Tolerances±0.04mm
    3、20.0mm<L/W≤85.0mm，Tolerances±0.04mm
    H
    1、0.2mm<H≤3.00mm，Tolerances±0.02mm
    2、3.00mm<H≤10.0mm，Tolerances±0.03mm
    3、H>10.0mm，Tolerances±0.05mm
    Flatness 1、L×W≤25.0mm²，Flatness±0.02mm
    2、25.0mm²<L×W≤400.0mm²，Flatness±0.03mm
    3、400.0mm²<L×W<5600.0mm²，Flatness±0.05mm
    Parallelism 1、0.20mm<L/W≤5.00mm，Parallelism±0.02mm
    2、5.00mm<L/W≤30.0mm，Parallelism±0.03mm
    3、30.0mm<L/W≤75.0mm，Parallelism±0.05mm
    4、L/W>75.0mm，Parallelism±0.10mm
    C Angle
    C≥0.1mm
    R Angle
    R≥0.1mm

  • 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

    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
    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 Countersunk 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 NdFeB Ring and block Magnets with Countersunk hole. 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.

< >

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 Rare Earth Countersunk 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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