The magnet with hole refers to one or more countersunk holes and through holes on the surface of the magnet. The magnet with hole is mainly made of rare earth NdFeb material, which can be square, rectangle, triangle, trapezoid and other shapes. Today we will introduces the factors that need to be considered during the selection of magnet screws with holes, and what kind of screws are better to fix magnet with holes.
Magnets with holes are usually used to fix or connect other objects, and appropriate screws are selected for fixing. We need to consider the size and shape of the magnet, the head type and type of the screw and the material and thickness of the object to be connected, the following are some suggestions given by Courage:
Illustration is neodymium square countersunk hole magnets
Screw type: hex socket screws, hex outer screws, flat head screws, metal expansion screws, ordinary screws, etc.
Size of screws: To choose the right size of the screw. One is the depth, ensure that the length of the screw is enough to pass through the hole of the magnet and penetrate the thickness of the object to be connected. The second is the width (or diameter), ensuring that it is not too loose or unable to pass through the hole of the magnet to be fixed.
Magnetism of screw: To avoid the use of magnetic screws. First reson is that they may interfere with the magnetic field of the magnet. The second reson is the magnet has magnetic, this is enough to met the demand of product uses. If the screw has magnetic, we have to consider the matching magnetic pole, otherwise the same sex repulsion.
Material of screws: Generally is used steel, iron and stainless steel. The material selected for screws and nuts should be adapted to the material of the object to be connected. If you want to attach to a metal surface, stainless steel screws are a common choice because they don't rust easily.
Screw head type: Screw head type is also a factor to consider. The most common screw head types are mortise, flat head, round head, cone, etc. Choose the screw head type that matches the object you need to connect and the tool you use.
Please note that before selecting a screw, you need to measure the size and depth of the hole to ensure that the most suitable screw is selected to hold the magnet and attach other objects. For the fixing of magnets with holes, the following screw types are considered to be the best choice：
1. Magnetic screws: Magnetic screws can use the magnetism of the magnet itself to enhance the fixation effect, because they can better fit the surface of the magnet. However, please note that the use of magnetic screws may affect the magnetic field of the magnet to a certain extent, so weigh the pros and cons when choosing.
2. Stainless steel screws: With the fixation of magnets with holes, stainless steel screws perform well in rust resistance. Especially in humid environments, stainless steel screws are a good choice because they are not easy to rust.
3. Copper screws: Copper screws have good electrical and thermal conductivity, so they are very popular in some special applications. For example, in cases where magnets are needed to conduct heat, copper screws may be a better choice.
4. Screws with anti-loosening function: In the case of vibration or large force, the screws may loose by themselves. Therefore, consider using screws with anti-loosening features, such as screws with reinforcement coating, to ensure the stability of the connection.
The above is some advices of the factor we can consider when we choose the screw to fix object with magnets and the recommendation of better type of screws. The fianal choice of screw is depends on your specific requirment and application.
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