Customers need to know the following things before purchasing ndfeb magnets:          
This kind of magnet sold by yiwu hao magnetic material factory belongs to neodymium iron boron rare earth permanent magnet, all belong to strong magnet, is the magnet with the highest commercial performance found at present. The best and strongest magnetic materials are well - deserved strong magnetic. It is called \"magneto\" because of its excellent magnetic properties. Please buy it with confidence and use it with care.          
 Ii. The specifications of our company include circle, square, circle, irregular shape, trapezoid, tile shape, spherical shape, irregular shape and so on. All of our magnet sizes are measured in millimeters.         
     【 1 】 generally expressed in D diameter circular size (due to belong to the special symbol for the convenience of the majority to use D instead of Φ), such as D10X1MM represents is 10 mm in diameter, 1 mm is the thickness of the magnet. X is the mathematical symbol times.         
     [2] the size of a square is X by X and the height is usually denoted by F. For example, F50x25x13MM, that is, the length of the square magnet is 50 mm, width is 25 mm, thickness is 13 mm, the general default in the last number of the magnetization direction of the square magnet, such as F50x25x13 square, magnetization direction is the direction of 13MM, that is, the direction of the height magnetization. NS is in the two largest faces, which are the 50x25 faces.         
     [3] the size of the ring is denoted by the outer diameter DX inner diameter DX height. The D32XD18X6 ring magnet, for example, shows an outer diameter of 32mm, an inner diameter of 18mm and a height of 6mm. Height is also called thickness. At present the ring is also divided into straight hole and countersunk hole, the hole is vertical hole, and countersunk hole is divided into large hole and small hole depth and small hole depth is commonly known as screw hole. 
Three, our company can produce a variety of grades of ndfeb magnets, as follows:
       N35 N38 N40 N42 N45 N48 N50 N52                       Maximum operating temperature 80 degrees    
           35 m. 38 m. 40 m 42 m. 45 m. 48 m 50 m.                           Maximum operating temperature 100 degrees    
           33 h 35 h 38 h 40 h 42 h 45 h 48 h.                         Maximum operating temperature 120 degrees    
           30SH 33SH 35SH 38SH 40SH 42SH                               Maximum operating temperature 150 degrees    
           30UH 33UH 35UH 38UH 40UH                                 Maximum operating temperature 180 degrees    
           30 eh eh eh eh 38 35 33                                     Maximum operating temperature 200 degrees                                 Ah ah ah 35 33 30                                       Maximum operating temperature 230 degrees     
33, 35, 38, 40, 42 and so on represent the maximum magnetic energy product. The maximum magnetic energy of N33 ndfeb material is about 33MGOe. The maximum magnetic energy of N35 ndfeb is about 35MGOe. The maximum magnetic energy of N40 ndfeb material is about 40MGOe. The conversion between MGOe and kA/m3 is 1MGOe = 8kA/m3, that is, the maximum magnetic energy of N40 is about 320kA/m3.       
The higher the brand, the stronger the magnetism, the higher the price. Under normal circumstances, such as packaging, machinery, stationery and other requirements are not high products are the main choice of n33 brand. Most of the middle and low - grade speaker magnets are n35.         
Sintered neodymium iron boron magnet, with unimaginable super magnetic force, sintered neodymium iron boron magnet theoretically maximum suction is its own weight hundreds of times, is the most powerful permanent magnet at present. Of course, the larger the size of the magnet, the stronger the magnetic force.         If you need to customize, please contact our customer service, indicating the size, brand, quantity, electroplating, tolerance requirements, magnetization direction, etc. We will customize the production according to your requirements.