China Neodymium And Ferrite Magnets Manufacturer & Supplier 
When buy magnets, “pull force” is one of the parameters that customers are most concerned about. For example, customers may ask: If a pull force of 10 kg (approximately 98 N) is required, how large should the magnet be?
The size of a magnet depends on its material, grade, contact area, etc. Among common materials, neodymium iron boron has the highest magnetic performance, especially the N54 grade. In contrast, ferrite requires several times the size of neodymium iron boron to achieve the same pulling force.
Below are the dimensions of 10kg pull force magnets sorted by Xiaofu, including three materials: ferrite, samarium cobalt, and neodymium iron boron.
Let's start with ferrite material. It is quite challenging for ordinary ferrite to achieve a tensile force of 10 kg. Even with a diameter of 50 mm and a thickness of 10 mm, the tensile force is only around 2 kg. To reach 10 kg, larger dimensions are required, such as 80 mm or larger. The recommended dimensions are a ring-shaped 85x32x22 mm, with pull force of approximately 12 kg. Ring-shaped ferrite with dimensions of 90x50x16mm can achieve a tensile force of around 10kg. Larger dimensions would be even more suitable.
10kg pull force neodymium block magnets
Neodymium magnets are much easier to achieve a pulling force of 10 kg compared to ferrite magnets, and they are also much smaller in size. For example, a neodymium magnet with a diameter of 22 mm and a thickness of 10 mm can achieve a pulling force of 10 kg. Other sizes such as 25x10mm, 30x15mm, and 40x10mm will all exceed 10kg of pulling force. For square shapes like 23x23x10mm, 10kg of pulling force can be achieved, but achieving this with a lower thickness may be challenging.
Let's take a look at samarium cobalt. To achieve a tensile force of 10 kg, the diameter of a round shape must be greater than 25 mm, and the thickness must be greater than 10 mm. Ring shape measuring 36 x 28 x 8 mm can also achieve a tensile force of 10 kg.
In summary, regardless of the material, the thickness and dimensions must not be too thin, otherwise it will not achieve a tensile force of 10kg. If a small volume is desired, choose neodymium material; if low cost is preferred, choose ferrite. You can choose to wrap the ferrite with a shell, such as ferrite pot magnets.
Worth knowing;
Difference between vertical and horizontal pull force of a magnet