Holding force

Magnet quality

Diameter (D)

Pot magnets with countersunk hole

Pot magnets with screw hole - also called countersunk magnets - are compact magnet systems with a steel shell and a countersunk hole for easy mounting. The bolt with a flat countersunk head falls flush with or in the top of the magnet. This optimizes the attracting surface of the pot magnet.

Thanks to the shell of these magnet systems, the magnetic field strength increases and the pot magnets are more resistant to corrosion or chemicals. Pot magnets have a single attracting surface. This precludes dispersion of the magnetic field.

Pot magnets with countersunk hole are available in various sizes and types such as neodymium, ferrite and AlNiCo.

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Neodymium The strongest magnet type

3 variants
Product variant

Neodymium (NdFeB) 16 mm

€ 2,66

PM-HS-N-SG-D16x4.5x3.5/6.6-HQ
Article number GM17425
Stock 4725
Holding force 75 N
Height 4.5 mm
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Product variant

Neodymium (NdFeB) 20 mm

€ 3,81

PM-HS-N-SG-D20x6xd4.5/9.3
Article number GM17426
Stock 305
Holding force 105 N
Height 6 mm
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Product variant

Neodymium (NdFeB) 25 mm

€ 4,92

PM-HS-N-SG-D25x7xd4.5/9
Article number GM17427
Stock 259
Holding force 160 N
Height 7 mm
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What does a neodymium pot magnet consist of?

These super-strong pot magnets are made of the alloy neodymium-iron-boron - (NdFeB) - which Goudsmit markets under the brand name Neoflux®. The shell - or pot - provides magnetic shielding. Goudsmit supplies neodymium pot magnets with a brass or steel shell. The holding surface is covered with a protective coating to prevent corrosion.

Neodymium pot magnet flat with countersunk hole | Goudsmit Magnetics

When does loss of magnetic strength occur?

Neodymium pot magnets have a maximum operating temperature of up to 80 °C. When heated to this temperature, the magnet loses 15 to 20% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature.

External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.

 

Neodymium pot magnet flat with countersunk hole | Goudsmit Magnetics

Tension on the magnet

For pot magnets with a cylinder hole, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.

Neodymium pot magnet flat with countersunk hole | Goudsmit Magnetics

Neodymium (continued) The strongest magnet type

3 variants
Product variant

Neodymium (NdFeB) 32 mm

€ 7,47

PM-HS-N-SG-D32x7xd5.5/11
Article number GM17428
Stock 679
Holding force 310 N
Height 7 mm
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Product variant

Neodymium (NdFeB) 40 mm

€ 10,66

PM-HS-N-SG-D40x8xd5,5/10.3
Article number GM17429
Stock 0
Holding force 500 N
Height 8 mm
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Product variant

Neodymium (NdFeB) 13 mm

€ 2,26

PM-HS-N-SG-D13x4.5xd3.5/6.6
Article number GM17424
Stock 0
Holding force 40 N
Height 4.5 mm
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Ferrite Cost effective

3 variants
Product variant

Ferrite 16 mm

€ 1,79

PM-HS-F-SG-D16x4.5xd3.5/6.5
Article number GM16600
Stock 1451
Holding force 14 N
Height 4.5 mm
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Product variant

Ferrite 20 mm

€ 1,84

PM-HS-F-SG-D20x6xd4.1/9.4
Article number GM16601
Stock 529
Holding force 27 N
Height 6 mm
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Product variant

Ferrite 32 mm

€ 2,24

PM-HS-F-SG-D32x7xd5.5/11.5
Article number GM16602
Stock 443
Holding force 72 N
Height 7 mm
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Good magnetic properties, affordably priced

Ferrite pot magnets, also referred to as ceramic pot magnets, are fitted with a steel pot that provides shielding of the magnetic field. Ferrite pot magnets require only a minimal installation height. This provides constructive advantages.

Ferrite pot magnet flat with countersunk hole | Goudsmit Magnetics

When does loss of magnetic strength occur?

Ferrite pot magnets have an operating temperature of up to 200 °C. When heated to this temperature, the magnet loses 30 to 40% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature. The magnetic force of these pot magnets is lower than that of neodymium pot magnets.

External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.

Ferrite pot magnet flat with countersunk hole | Goudsmit Magnetics

Corrosion-resistant

Ferrite pot magnets do not corrode and are very suitable for outdoor use. With this type of pot magnet, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.

Ferrite pot magnet flat with countersunk hole | Goudsmit Magnetics

Ferrite (continued) Cost effective

2 variants
Product variant

Ferrite 25 mm

€ 2,01

PM-HS-F-SG-D25x7xd5.5/11.5
Article number GM16607
Stock 72
Holding force 36 N
Height 7 mm
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Product variant

Ferrite 40 mm

€ 2,96

PM-HS-F-SG-D40x8xd5.5/12.5
Article number GM16603
Stock 341
Holding force 90 N
Height 8 mm
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AlNiCo Very high operating temperature

3 variants
Product variant

AlNiCo 19.1 mm

€ 4,80

PM-HS-A-SR-D19.1x7.5xd3.7/8.7
Article number GM16201
Stock 40
Holding force 30 N
Height 7.5 mm
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Product variant

AlNiCo 28.6 mm

€ 6,27

PM-HS-A-SR-D28.6x8.5xd4.8/10.5
Article number GM16202
Stock 39
Holding force 40 N
Height 8.5 mm
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Product variant

AlNiCo 38.1 mm

€ 11,68

PM-HS-A-SR-D38.1x10.4xd4.8/10.
Article number GM16203
Stock 26
Holding force 80 N
Height 10.4 mm
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What does an AlNiCo pot magnet consist of?

AlNiCo pot magnets are made of an alloy of aluminium, nickel and cobalt. They are encased in a steel pot, with a non-magnetizable material - brass or aluminium - in between. AlNiCo pot magnets have a very high operating temperature.

AlNiCo pot magnet with countersunk hole | Goudsmit Magnetics

When does loss of magnetic strength occur?

AlNico pot magnets have a very high operating temperature of up to 450 °C. When heated to this temperature, the magnet loses 30 to 40% of its magnetic force. This is not permanent; the force is restored when the pot magnet cools down to ambient temperature.

External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.

AlNiCo pot magnet with countersunk hole | Goudsmit Magnetics

Corrosion-resistant

AlNico pot magnets do not corrode and are very suitable for use at high temperatures. With this type of pot magnet, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.

AlNiCo pot magnet with countersunk hole | Goudsmit Magnetics

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