China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Today, we will introduce a special type of magnet - cup-shaped magnets with countersunk holes. This type of magnet has its unique advantages, strong tensile strength, and is not easily broken. Let's continue reading.
Introduction to the name of cup magnets with countersunk holes
A “cup magnet” is a magnet with a metal casing (usually steel or stainless steel) that resembles the shape of a pot lid, hence the name. Cup magnets with countersunk holes have a tapered groove (countersunk hole) in the center or side of the magnet, making it easy to screw onto various equipment surfaces.
Pictures of 32mm OD cup magnets with countersunk holes.
Cup magnets with countersunk holes composition structure
Magnetic core: Usually powerful magnets are used, such as neodymium iron boron (NdFeB), samarium cobalt (SmCo). A few customers use ferrite.
Metal casing: made of mild steel or stainless steel, which plays the role of protecting the magnets and enhances the concentration of magnetic force through the effect of magnetic conduction.
Countersunk hole design: Generally have 90℃ or 120℃ countersunk holes, suitable for flat head screws (countersunk screws) installation.
Magnetism strength of cup magnets with countersunk holes
Mainly depends on the core material and size, common neodymium iron boron material pull force range from 2.5kg to 200kg.
Common types of cup magnets with countersunk holes;
Single-sided adsorption type (standard countersunk hole cup magnet): strong magnetic properties on the bottom side, suitable for metal surface fixing, salvage in water, etc.
Rubber-covered type: covered with a rubber layer to increase friction and prevent scratching the surface, commonly used in automobiles, electronic equipment and other fields.
Common types of cup magnets with countersunk holes;
There are mainly round, square and rectangular by shape. Standard cup magnets with countersunk holes are single sided, with only one side being highly magnetic, and are suitable for metal surface fixing, water salvage, and so on. Some customers may require a rubberized coating for specific applications.
Precautions for purchasing cup magnets with countersunk holes
1. Select the appropriate size and suction force according to the application requirements, to avoid too large or too small to affect the use of the effect.
2. Cup shell material mild steel galvanized corrosion resistance in general, stainless steel rust resistance is stronger.
3. If used in high temperature or humid environment, it is recommended to choose samarium cobalt material (temperature resistance 350℃) to improve durability.
Hope the above introduction is helpful to you, need to buy countersunk pot (cup) magnets remember to mail us!
Related product columns: Neodymium pot magnets