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40mm O.D x 25mm I.D x 5mm thick Neodymium Magnet - 20kg Pull

code: D-SP4025

High-performance Neodymium (N42) ring magnet with north and south poles on opposing circular faces.

1. Select Pack Size
Pack Qty Pack Price Unit Price

1. Select Pack Size

40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 1 )
40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 1 )

High-performance Neodymium (N42) ring magnet with north and south poles on opposing circular faces.

  • 40mm outer diameter x 25mm inner diameter x 5mm thick
  • Each magnet's north and south pole are on opposite circular faces
  • Each magnet can support a steel weight of up to 20kg vertically from the magnetic face when in flush contact with a mild steel surface
  • Excellent resistance to demagnetisation
  • Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish

These versatile high-performance ring magnets, with north and south poles on opposing circular faces, have many uses. They are used in many everyday appliances such as vacuum cleaners plus motors, generators, rotor shafts and more. They can even be used to demonstrate intriguing 'eddy currents' using a copper pipe slightly thinner than the magnets inner diameter. Simply slide the ring over the pipe and let it slide down its length and watch it slowly descend as the eddy currents produced create a damping effect. Compare this with an unmagnetised ring of the same dimension by repeating and watch as the unmagnetised ring slides down the pipe in an instant. A great way to bring magnets to life in the classroom.

£8.50 £8.50 each

1. Select Pack Size

40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 10 )
40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 10 )

High-performance Neodymium (N42) ring magnet with north and south poles on opposing circular faces.

  • Pack of 10
  • 40mm outer diameter x 25mm inner diameter x 5mm thick
  • Each magnet's north and south pole are on opposite circular faces
  • Each magnet can support a steel weight of up to 20kg vertically from the magnetic face when in flush contact with a mild steel surface
  • Excellent resistance to demagnetisation
  • Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish

These versatile high-performance ring magnets, with north and south poles on opposing circular faces, have many uses. They are used in many everyday appliances such as vacuum cleaners plus motors, generators, rotor shafts and more. They can even be used to demonstrate intriguing 'eddy currents' using a copper pipe slightly thinner than the magnets inner diameter. Simply slide the ring over the pipe and let it slide down its length and watch it slowly descend as the eddy currents produced create a damping effect. Compare this with an unmagnetised ring of the same dimension by repeating and watch as the unmagnetised ring slides down the pipe in an instant. A great way to bring magnets to life in the classroom.

£80.34 £8.03 each

1. Select Pack Size

40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 20 )
40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 20 )

High-performance Neodymium (N42) ring magnet with north and south poles on opposing circular faces.

  • Pack of 20
  • 40mm outer diameter x 25mm inner diameter x 5mm thick
  • Each magnet's north and south pole are on opposite circular faces
  • Each magnet can support a steel weight of up to 20kg vertically from the magnetic face when in flush contact with a mild steel surface
  • Excellent resistance to demagnetisation
  • Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish

These versatile high-performance ring magnets, with north and south poles on opposing circular faces, have many uses. They are used in many everyday appliances such as vacuum cleaners plus motors, generators, rotor shafts and more. They can even be used to demonstrate intriguing 'eddy currents' using a copper pipe slightly thinner than the magnets inner diameter. Simply slide the ring over the pipe and let it slide down its length and watch it slowly descend as the eddy currents produced create a damping effect. Compare this with an unmagnetised ring of the same dimension by repeating and watch as the unmagnetised ring slides down the pipe in an instant. A great way to bring magnets to life in the classroom.

£153.47 £7.67 each

1. Select Pack Size

40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 40 )
40mm O.D. x 25mm I.D. x 5mm thick Neodymium Magnet - 20kg Pull ( Pack of 40 )

High-performance Neodymium (N42) ring magnet with north and south poles on opposing circular faces.

  • Pack of 40
  • 40mm outer diameter x 25mm inner diameter x 5mm thick
  • Each magnet's north and south pole are on opposite circular faces
  • Each magnet can support a steel weight of up to 20kg vertically from the magnetic face when in flush contact with a mild steel surface
  • Excellent resistance to demagnetisation
  • Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish

These versatile high-performance ring magnets, with north and south poles on opposing circular faces, have many uses. They are used in many everyday appliances such as vacuum cleaners plus motors, generators, rotor shafts and more. They can even be used to demonstrate intriguing 'eddy currents' using a copper pipe slightly thinner than the magnets inner diameter. Simply slide the ring over the pipe and let it slide down its length and watch it slowly descend as the eddy currents produced create a damping effect. Compare this with an unmagnetised ring of the same dimension by repeating and watch as the unmagnetised ring slides down the pipe in an instant. A great way to bring magnets to life in the classroom.

£286.34 £7.16 each
Higher Quantities? Contact us today for volume pricing.
Item in Stock  |  Same Day Dispatch Before 4pm (Mon - Fri)
£8.50
Product Code: SP4025
Shape: Disc
Magnetic Face: 40mm dia
Thickness: 5mm
Material: NdFeB
Performance (Gauss): 3400
Vertical Pull (Kg): 20
Slide Resistance (Kg): 4
Max Temp (degrees C): 80
Fixing: Araldite/Loctite
  • 40mm outer diameter x 25mm inner diameter x 5mm thick
  • Each magnet's north and south pole are on opposite circular faces
  • Each magnet can support a steel weight of up to 20kg vertically from the magnetic face when in flush contact with a mild steel surface
  • Excellent resistance to demagnetisation
  • Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish

These versatile high-performance ring magnets, with north and south poles on opposing circular faces, have many uses. They are used in many everyday appliances such as vacuum cleaners plus motors, generators, rotor shafts and more. They can even be used to demonstrate intriguing 'eddy currents' using a copper pipe slightly thinner than the magnets inner diameter. Simply slide the ring over the pipe and let it slide down its length and watch it slowly descend as the eddy currents produced create a damping effect. Compare this with an unmagnetised ring of the same dimension by repeating and watch as the unmagnetised ring slides down the pipe in an instant. A great way to bring magnets to life in the classroom.

5.00 out of 5 based on 1 rating.
Showing our 1 review for 40mm O.D x 25mm I.D x 5mm thick Neodymium Magnet - 20kg Pull. Write a review ›
  • Currently 5/5 Stars.
5I use first4magnets on a regular basis due to the quality of their products

I use first4magnets on a regular basis due to the quality of their products, and the quality of their service. Furthermore i have always found them to be punctual, knowledgable and informative throughout every stage of my order.