Buy Neodymium Magnets – The Strongest Magnet in the World

Can I get dimension inspection report and BH curve of the magnets ?
We can provide inspection report and demagnetization curve (BH curve) to our customers after production.

Differences Between Permanent Magnets and Electromagnets
The permanent magnet has magnetism itself. As the nature of permanent magnets, the magnetism will not be eliminated by outside effect. Electromagnets are made of coil and core. When the core is energized, the electromagnet has magnetism and it does not have magnetism when out of energy. Another difference is that the magnetism of permanent magnets does not change, but the magnetism of the electromagnet with change according to the coil turns, current and the material of the core.

Which appliances that used in neodymium magnets production?
Appliances that used in neodymium magnets production: melting furnace, cracker, ball mill, jet mill, press molding machine, vacuum packaging machine, isocratic presses, sintering furnace, heat treatment, vacuum furnace, magnetic properties tester gauss meter.
Appliances that used in neodymium magnet processing: dedicated slicker, WEDM, flat mill sided machine, punching machine, chamfering machine, electroplating equipment.

What are the basic coatings for neodymium magnets?
For neodymium magnets, they often need to be coated with Zn, Ni, NiCuNi, epoxy, and other coatings to protect their surfaces from corrosion and oxidization. But for AlNiCo, SmCo or ferrite magnets, they commonly do no need to be coated due to their own remarkable resistance against corrosion and oxidization.

Which are the strongest magnets nowadays?
The strongest magnets available today are neodymium magnets.

What are rare earth magnets?
Rare earth magnets are magnets that are made out of the rare earth group of elements. The most common rare earth magnets are the neodymium & SmCo magnets.

What are permanent magnets made of?
Modern permanent magnets are made of special alloys that have been found through research to create increasingly better magnets. The most common families of magnet materials today are ones made out of AlNiCo, ferrite magnets, neodymium iron boron magnets, and SmCo.

What is the grade of a magnet?
Please visiting our magnetic properties & direction for more details.

Will magnets lose their power over time?
Modern magnet materials do lose a very small fraction of their magnetism over time. For Samarium Cobalt materials, for example, this has been shown to be less that 1% over a period of ten years.

What are the characteristics of magnets?
1.)Residual Induction (i.e. Br, and measured in Gauss). This is an indication of how strong the magnet is capable of being.
2.)Coercive Force (i.e. Hc, and measured in Oersteds). This is an indication of how difficult it is to demagnetize the magnet.
3.)Maximum Energy Product (i.e. BHmax, and measured in Gauss-Oersteds). This is an indication of what volume of magnet material is required to project a given level of magnetic flux.

How to measure the strength of the magnets?
Gauss meters are used to measure the magnetic field density at the surface of the magnet. This is referred to as the surface field and is measured in Gauss (or Tesla).  Pull Force Testers are used to test the holding force of a magnet that is in contact with a flat steel plate. Pull forces are measured in pounds (or kilograms).

How to identify the poles of the magnets?
Three methods are listed as below can be used to distinguish the North and South poles of magnets.
1) Use a compass, the end of the needle that normally points North will be attracted to the South pole of the neodymium magnet.
2) Use another magnet that is already marked. The North pole of the marked magnet will be attracted to the South pole of the unmarked magnet.
3) Use a Gauss Meter.

Are there any industry standards for Magnets?
Yes. Two industry associations produce standards. The Magnetic Materials Producers Association (MMPA) publishes standards for the production of magnetic materials, and the Magnet Distributors and Fabrications Association (MDFA) produces standards on various ways of testing magnets and magnetic devices.

What are the maximum operating temperatures for different rare earth magnets materials?

Can I machine magnets?
Magnets should be machined using diamond tools or soft grinding wheels, and in the un-magnetization condition. In general, it is best not to try to machine hard magnet materials unless you are familiar with these specialized machining techniques.

What is the machining process of sintered neodymium magnets?
Basically the main machining process includes burdening, smelting, pulverization, molding, sintering, testing, machining, electroplating, magnetizing, final examining and packing.

What factors determine the cost of machine magnets?
· Quantity - the larger the quantity, the lower price
· Material
· Shape & Tolerances

What might affect a magnet's strength?
The factors below can affect a magnet's strength:

How can I block the magnetic field?
Only materials that are attracted to a magnet can 'block' a magnetic field. Depending on how thick the blocking piece is, it will partially or completely block the magnetic field.

Tips on handling and storing magnets

If a magnet which has lost its magnetism can be re-magnetized?
The magnet can be re-magnetized back to its original strength, provided that the material has not been damaged by extreme heat.

How to separate the magnets?
Small magnets can be part by hand, sliding bit by bit off other magnets. If they are of big size, you can separate them by using edge of desk or corner. Place magnets on the desk with a magnet hanging over ,then use your whole body to press the magnet down, but you should be careful at the same time, do not get off your balance. Now there are two easy ways, magnets are colored in grey.
1. Using two nailed sticks, put the magnets between the sticks, please refer to the sketch as below;


2. Using one object to press one magnet, then use another heavy object to push down the other magnet, please refer to the sketch as follows:


How to assemble magnets to a device?
If a magnet needs to be fastened to a device, you can use either mechanical means, or adhesives to secure the magnet in place. Adhesives are often used to secure magnets in place. If magnets are being adhered to uneven surfaces, you will need an adhesive with plenty of 'body' so that it will conform to the uneven surface. Hot glues have been found to work well for adhering magnets to ceramics, wood, cloth, and other materials. For magnets being adhered to metal, 'super-glues' can be used very effectively.
Select and order magnets

Which transportation is the best for my magnets?
We choose different trade terms and shipping method as per different gross weight of the magnets and customer's requirements. For light weight (0-50kgs), we often select express as the shipping method. For heavy weight (50-100kgs), air shipment is preferred. For weight (above 100kgs), sea shipment is suitable. But if you have specified requirements, we will operate it according to your needs.

Why magnets can not be taken on passenger plane?
In the airport security channel, an operator of X-ray found that a few piece of metal objects have firmly suck the keys and coins beside them when he open a suitcase of a passanger. These metal pieces are magnets, which were prepared to secretly taken on the plane by the passenger.
Why magnets can not be taken on passenger plane? According to the civil aviation security checks regulations: strongly magnetized objects that may interfere the normal work of the various instruments on the aircraft are prohibited to be carried by passengers or consigned. Therefore, this passenger failed take the these magnets on board.

Can I pay you by Credit Card or Paypal?
Yes, for small amount, you can pay us by Credit Card or Paypal. You can also pay by Western Union. But bank transfer(T/T) is the best way.

What's your delivery port in China ?
Generally, our delivery port of air cargo is Hong Kong or Beijing or others, the delivery port of sea shipment is Shanghai port. If you have special request on the delivery port, please let us know. It can be negotiated.

How to pack strong neodymium magnets to export by air?
For air cargo, powerful neodymium magnets need to be demagnetized by specialized agencies (Bureau of Technical Supervision).The so-called demagnetization does not mean the disappearance of magnetic properties, but means the re-combination of items in a unit package, making the external displayed magnetic properties meet the requirements of state aviation safe transport. As for the powerful neodymium magnets, they can be magnetic isolated through packing, we usually pack them with iron sheets and foam.
They are generally fixed by iron sheets, then the bubble packs and then carton packages. For a number of weak magnetic magnets, these packing can pass the airline security check.
At present, there are many materials have the same effect, but we have to find them in market. Our technical staffs are able to reassemble the powerful magnets to reduce their magnetic properties. Only by this can powerful magnets pass the airlines security and arrive to the foreign customers at the fastest speed.

How to select a grade of magnets?
Selecting a grade is the next step, once you have decided which permanent magnet material is best for your application. One way to select the suitable grade for your application is "trial and error". You can purchase the several magnets with different grades (some suppliers have these magnets available on their shelves) and try each grade until you find one right for your application.

How do I buy neodymium magnets?
If you want to buy neodymium magnets, welcome to visiting magnet China for more details.

How do you pack the magnets to ensure shipments safely?
We use carton and steel partition to pack the goods and ensure that every box is firm, secure and non-magnetic in accordance with national and international transportation regulations. If you have other specific packing requirements, please let us know in advance.

Display of the lines of Magnetic flux
Lines of force are three dimensional, surrounding a bar magnet on all sides. Homo-polar repels and hetero-polar attracted.


When opposite poles are approaching, the lines of force join up and the magnets pull together.


But the same poles will repel when they close to each other.

Sketch of Magnetization direction
Different shaped magnets have different kinds of magnetization direction. Please refer to the enclosed sketch below: