Countersunk pot magnet Ø 20 mm

strength approx. 9 kg
promptly deliverable


Top seller: More than 3 300 000 sold!
This magnet in a steel pot has a countersunk borehole and can be fastened with a countersunk screw. This is one of our top sellers, thanks to its versatility: It is used in the shopfitting industry as well as in plastics engineering, the automotive industry and mechanical engineering and construction.

The following screws fit into the CSN-20, for example:
  • Slotted countersunk wood screw: DIN 97 (3,5 mm)
  • Cross recessed countersunk flat head screws (machine screw): ISO 7046-2 M3 (3 mm)
  • Countersunk torx screws/hexalobular socket (machine screw): ISO 14581 M3 (3 mm)
  • Hexagon socket countersunk flat head screws (machine screw): ISO 10642 M3 (3 mm)
Read about more features and tips

Technical data

Article ID CSN-20
EAN 7640155431606
Material NdFeB
Pot diameter D 20 mm
Total height H 6 mm
Borehole d1 4,5 mm
Countersinking d2 9,46 mm
Countersinking t 2,48 mm
Tolerance +/- 0,1 mm
Coating Nickel-plated (Ni-Cu-Ni)
Steel Q235 (China)
Magnetisation N38
Strength approx. 9 kg (approx. 88,3 N)
Max. working temperature 80°C
Weight 11 g
PDF data sheet

Additional features and tips

Click to enlarge
The graph shows the maximum adhesive force in kg (y axis) at various distances in mm (x axis) between pot magnet and counterpart (steel plate).
Example: At a 1 mm distance between pot magnet and steel plate the maximum adhesive force is still 2 kg.

Click to enlarge
Here you can see the difference between a CSN and a CSN-ES magnet. Although both types have similar dimensions on the outside, the CSN-ES has a thicker steel pot (in grey) and a slightly smaller magnet. This leads to an overall stronger adhesive force, despite the smaller magnet, because the metallic adhesive surfaces are larger.
Since the new CSN-ES magnet is too strong for some of our customers, we also offer the somewhat weaker CSN-alternative.
The answer to why you can arrange pot magnets only side by side can be found under our FAQ.
Here you can see 5 sizes of CSN magnets stacked on top of each other - from top to bottom:
  • CSN-16

  • CSN-20

  • CSN-25

  • CSN-32

  • CSN-40