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What should I pay attention to when ordering neodymium magnets?

1. Performance:
Powerful magnet refers to powerful magnet, professional name: rare earth strong magnet, neodymium iron boron, this kind of magnet generally has relatively high performance and is commonly used in toys, packaging boxes, lamps, handicrafts, speakers, medical machinery, health products, electronic products, For hardware tools and other products, N33, N35, and N38 are generally suitable. These three are the most common properties of NdFeB magnets. Under normal circumstances, if the requirements are not very high, these three types of magnets are almost the same. .
1Powerful magnet
 
  High performance above N40: This performance is generally used in mobile phones, precision instruments, aerospace, and cutting-edge scientific research. It can be divided into nine types: N40, N42, N45, N48, N50, and N52. The temperature resistance of the above nine properties is less than or equal to 80íŠ. Once the temperature exceeds this temperature, it will be demagnetized. Therefore, if the customer considers high temperature resistance and high performance, then the following properties are recommended:
  1. The data ends with M, for example: N50M, the temperature resistance is generally ≤100íŠ
  2, the data ends with H, for example: N48H, the temperature resistance is generally ≤120íŠ
  3. The data ends with SH, for example: N45SH temperature resistance is generally ≤150íŠ
  4. The data ends with UH, for example: N35UH The temperature resistance is generally ≤180íŠ
  5. The data ends with EH, for example: N35EH, the temperature resistance is generally ≤200íŠ
  The above five properties are all high-temperature resistant types. Once the temperature exceeds the predetermined temperature, the magnet will demagnetize.
  Second, coating
  Many customers don’t understand the meaning of coating. NdFeB magnets generally require coating, so that it can prevent rust, and secondly, it is also beautiful. There are generally two types of coatings: zinc plating and nickel plating. Galvanized is generally white, the surface looks like the color of stainless steel, the price is the cheapest; nickel plating is generally silver-white, looks like silver, the price is more expensive than galvanized, but the color of nickel The color is better than zinc, and the plating layer is also longer than zinc, and it is not easy to peel off. There is another case for the coating. Generally European and American customers are very fancy about environmental protection, so they require the magnet to be environmentally friendly. In this case, the price is relatively more expensive. The surface of the environmentally friendly zinc (blue zinc) plating looks blue, but the surface of the magnet It's still white. There is no difference in nickel plating.
  Three, tolerance requirements
For general manufacturers, the magnetic tolerance is calculated and processed according to the standard tolerance. The standard tolerance is ±0.05 wire (1 mm = 100 wire). If the customer has no tolerance requirements, it will be processed according to this standard.
  Four, magnetic direction
  General disc points: axial magnetization and radial magnetization
  Axial magnetism: it is ordinary magnetism, generally divided into N and S poles, the magnetic force is on the front and back of the disc, if it is cylindrical, it is at both ends
  Radial magnetism: Generally there are more cylinders. After magnetism, the magnetic force will be on the entire cylinder instead of both ends, which is just the opposite of axial magnetism.
  Here is the focus on the direction of the block’s magnetism:
  Blocks are also very versatile. After many customers reported the size and performance of the block, when I asked them which direction is the magnetizing direction, they all said they didn’t know, and they didn’t know. It should be known that the price of magnetizing is different if the magnetizing direction is different, and if the magnetizing direction is wrong, the magnets made will be useless. This is mainly for strong magnetic blocks: F30*10*5 mm. Generally, the direction of magnetization of the block is in the thickness, which is the last number. For example, if it is the thickness of magnetization, it should be 5. In this case , The attraction surface of the magnet is the two large surfaces of 30*10. Generally, magnets are divided into SN poles, which means that the SN poles of this square magnet are on the two large surfaces of 30*10.

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