NingBo BeiLun Meank Magnetics Co., Ltd
NingBo BeiLun Meank Magnetics Co., Ltd
Contact
Strong Magnets

Strong Magnets

Magnetic material are made into certain shapes based on different application requirement.

These types of magnets include: disc magnets, square magnets/magnet blocks, ring magnets,  cylinder magnets, countersunk magnets, cone magnets and arc magnets. All the shapes above are basic shapes for magnets of which  the material is neodymium, ferrite or SmCo.

We also have wide size range for each types of neodymium magnets for sale.

Different Types of Strong Magnets for Sale

Different Types of Strong Magnets for Sale
  • Neodymium Disc Magnets
    Neodymium Disc Magnets
    disc neodymium magnets/disc NdFeB magnets/ neodymium magnet discs/ NdFeB disc magnets
  • Neodymium Blocks/Rectangle Magnets
    Neodymium Blocks/Rectangle Magnets
    Neodymium block/rectangle magnets also called as square/rectangular NdFeB magnets and NdFeB magnet blocks
  • Neodymium Ring Magnets
    Neodymium Ring Magnets
    Ring magnets means the magnets that in ring shape,someone call them magnet rings. Ring magnet is one of the common type for permanent magnets.The neodymium ring magnets (neodymium magnetic rings) are ...
  • Neodymium Cylinder/Rod Magnets
    Neodymium Cylinder/Rod Magnets
    Cylinder magnets express the same mean of rod magnets and magnetic rods.The neodymium cylinder magnets can be also called as neodymium rod magnets,they are cylinder magnets that made from rare-earth n...
  • Neodymium Cube Magnets
    Neodymium Cube Magnets
    Cube magnets(also known as cubic magnets) are special block magnets, which have the same sizes for length,width and height. They also also called as magnet cube blocks. The neodymium cube magnets are cube magnets that made from neodymium magn...
  • Neodymium Ball/Sphere Magnets
    Neodymium Ball/Sphere Magnets
    Sphere magnets are permanent magnet balls or magnetic balls. No matter ball magnet or sphere magnet,they just tell us the same shape for a permanent magnet.The neodymium ball magnets/neodymium sphere ...
  • Neodymium Countersunk Magnets
    Neodymium Countersunk Magnets
    Beside s of common shape—disc magnets, block magnets, cylinder magnets, ring magnets, neodymium countersunk magnets are also very important for daily life. Most of countersunk magnets /countersink ma...
  • Neodymium Tube Magnets
    Neodymium Tube Magnets
    Tube magnets are permanent magnets in tube shape. The tubes made of magnetic material are called magnet tubes of magnetic tubes. It becomes to be a tube magnet when make a hole through the axial of a ...
  • Neodymium Cone Magnets
    Neodymium Cone Magnets
    As neodymium magnets used more and more widely, common shape (such as disc magnets, block magnets, ring magnets, cylinder magnets ) can not meet all magnet application any more. For special situation,...
  • Neodymium Arc/Segment Magnets
    Neodymium Arc/Segment Magnets
    Neodymium arc magnets are special shape of rare earth permanent magnets. This type of super power magnets are always made via wire cutting and grinding etc. Regular arc magnets or segment magnets have...
  • Plastic Coated Magnets
    Plastic Coated Magnets
    To realize the better effect of waterproof and resist abrasion, meank magnetics also developed out plastic coated magnets or plastic wrapped magnets. That is make neodymium magnets with plastic coated...
  • Adhesive Magnets
    Adhesive Magnets
    Adhesive magnets are used more and more in daily life. Someone ask what is adhesive magnet? Adhesive has not magnetism itself. Adhesive magnet(magnet with adhesive) is just magnet magnet with a 3M adh...
.
Products

Different Types of Strong Permanent Magnets


NdFeB magnets are divided into sintered and bonded types. Sintered neodymium-iron-boron (NdFeB) has the highest magnetic energy product, and known as the strongest permanent magnet.

Strong magnets can be SmCo material which known as rare earth magnets, when the working temperature is above 180℃, its maximum magnetic energy product (BHmax), coercivity, temperature stability and chemical stability are better than those of NdFeB magnets.The maximum energy product (BHmax) of SmCo magnets ranges from 16 MGOe to 32 MGOe, and its theoretical limit is 34 MGOe

The magnetic energy product of ferrite (ceramic) magnet is much lower than that of NdFeB and SmCo, but big ferrite magnets that have powerful magnetism are also called strong magnets.

Besides the above permanent magnetic material for sale, some permanent magnetic assemblies(such as pot magnets, fishing magnets,hook magnets) are also called strong magnets.

Here we just introduce some common shapes of neodymium strong magnets, and mainly for sintered neodymium magnets. Because of the high machinability, it can be machined into different shapes and very wide size range is available for each shape. Besides of disc, cylinder, ring and block, neodymium magnets can be machined into some special shapes, for example, countersunk neodymium magnets, sphere neodymium magnets, neodymium cone magnets, neodymium arc & segment magnets, and neodymium convex magnets.

How to Estimate Permanent Strong Magnets Qualified or Not?


Estimate strong magnets qualified or not, mainly decided by these aspects:

Magnetic performance & property:magnetic performance of permanent strong magnet depends on the formulation,which mainly include remanence, coercivity and magnetic energy product.Magnetic properties are the most important aspect for a magnets and need professional instrument testing.

Tolerance of the magnets:the tolerance accuracy decided by the machine ability of a factory. The machining equipment keeps updated as market needs. Efficient devices and automation trend of industrial processing, not only meet the need of increasing magnets accuracy but also save the manpower and cost.

Appearance of the magnets: appearance evaluation firstly depends on whether there are defects in electroplating; secondly, see if there is a lack of angle in the magnets.

Application of Strong Neodymium Magnets


Neodymium strong magnets are more and more used for fabrics, such as neodymium sew-in magnets which can be sewed in curtains,and also sewed in clothes used as waterproof magnetic buttons.
Some small strong magnets are used for decorating fridge, or used on fridge or whiteboard as memo magnets.
Strong neodymium magnets for heavy duty hanging, the big neodymium hook magnets have hundreds of kilograms holding force,and used as magnetic ceiling hooks and wall hooks.
Strong magnets of neodymium are used for magnet fishing and searching, neodymium search magnets have strong magnetic force and used to get out the metal objects that fell to the bottom of river and wall.

1. Strong neodymium magnets are widely used for producing motors. By using neodymium magnetic tiles, the performance of motors are more stable.
2. Strong neodymium magnets are used for making speaker. Due to the outstanding magnetic performance, strong neodymium magnets make the size of the speaker smallest.
3. Neodymium strong magnets are widely used for magnetic separating. By using magnetic separator of neodymium strong magnets, the metal impurities are filtered more thoroughly from food or grain.


Physical Properties of Neodymium Magnet


Parameter

International Unit

Standard Data

Curie Temperature(Tc)

310-380

Maximum Operating Temperature(Tw)

80-230

Hardness

Hv

620

Electrical Resistivity (ᵨ)

Ω.cm

1.8x10⁻⁴  ~2.0x10⁻⁴

Density(D)

g/m³

7.45~-7.65

Recoil Permeability(µ rec)


1.05

Magnetization Field Strength(Hs)

kA/m

≧2400

kOe

≧30

Bending Strength

Mpa

295-345

Temp. Coefficient of Br

%℃

-0.11~-0.12

Temp.Coefficient of Hcj

%℃

-0.5~-0.7


Surface Treatments for Neodymium Magnets


Surface

Coating

Thickness (Microns)

Color

Resistance

Passivation


1

Silver Grey

Temporary Protection

Nickel

Ni+Ni

10-20

Bright Silver

Excellent Against Humidity

Ni+Cu+Ni

Zinc

Zn

8-20

Bright Blue

Good Against Salt Spray

C-Zn

Shinny Color

Excellent Against Salt Spray

Tin

Ni+Cu+Sn

15-20

Silver

Superior Against Humidity

Silver

Ni+Cu+Ag

10-20

Silver

Superior Against Humidity

Gold

Ni+Cu+Au

10-20

Gold

Superior Against Humidity

Copper

Ni+Cu

10-20

Gold

Temporary Protection

Epoxy

Epoxy

15-25

Black,Red,Grey

Excellent Against Humidity&Salt Spray

Ni+Cu+Epoxy

Zn+Epoxy

Parylene

Parylene

5-20

Grey

Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved

Chemical

Ni

10-20

Silver Grey

Excellent Against Humidity


Best Temperatures to use for Neodymium Magnets


Every grade of neodymium magnet has a specific maximum working temperature as the below list,the best temperature should not exceed the maximum of the neodymium magnets.

Neodymium MaterialGrade

MaximumWorking Temp.

Curie Temp.

N

176°F (80°C)

590°F (310°C)

NM

212°F (100°C)

644°F (340°C)

NH

248°F (120°C)

644°F (340°C)

NSH

302°F (150°C)

644°F (340°C)

NUH

356°F (180°C)

662°F (350°C)

NEH

392°F (200°C)

662°F (350°C)

NAH

428°F (220°C)

662°F (350°C)

Strong Magnets

Common Machining Methods of Neodymium Magnets 


Grinding machining: For sintered NdFeB magnets, grinding machine needed for the surface of rough delivered magnets. Common used grinding machine methods for block NdFeB magnets are plane grinding, two end face grinding, inner circle grinding, out circle grinding.  Cylinder NdFeB magnets adopt coreless grinding and two end plane grinding. Irregular magnets (arc magnets and segment magnets) adopt multi-station grinding.

Drilling machining: processing cylinder magnets and block magnets into round tube magnets and block magnet tubes.

Cutting machining: processing round magnet rod and magnet blocks into round magnet discs and square magnet discs.

Profile machining: processing rod magnets and rectangle magnets into arc magnets, segment magnets, cone magnets, countersunk magnets, convex magnets, ball magnets and other complex shape magnets.
.
Contact
Excellent Customer Service
Take advantage of our network and see
what Meank can do for you.
Industry News of Neodymium Magnets
Industry News