Neodymium NdFeb Ring Magnets

Strong magnet ideal for screw mounting for holding and attaching purposes

  • High strength magnetic performance
  • With countersunk hole for screw mounting
  • Nickel plated, corrosion resistant
  • N35 grade material
  • 80°C max operating temperature

Overview - Neodymium NdFeb Ring Magnets

Neodymium (rare earth) NdFeB ring magnets / NdFeB countersunk ring magnets / NdFeB counterbore ring magnets

A  ring magnet or NdFeB Rare Earth  ring magnet is a NdFeB disc magnet with a concentric hole inside it. A countersunk magnet is a Neodymium ring magnet with one side appearing as a standard ring but the other side has an angled countersink to take a screw head, the angle usually being (but not always) 90 degrees. It has a cylindrical flat-bottomed hole on one side that enlarges the main central hole to take a cap head screw.

Alternative Names for Neodymium Ring Magnets

Neodymium ring magnets are also known as Neodymium pure ring magnets or Neodymium countersunk magnets, and Neodymium counterbore ring magnets. These  variations are nearly always axially magnetised - the magnet is magnetised along its central axis. So one flat end face is a North pole and the other flat end face is a South pole.

For pure rings, turning over the ring changes the polarity. But for the NdFeB countersunk rings and the NdFeB counterbore rings the countersunk or counterbore side will be a North or a South and the other end (which will visually look like a pure ring) will have the opposite polarity). In some applications where a NdFeB counterbore ring is attracting another NdFeB counterbore ring or a NdFeB countersunk ring is attracting another NdFeB countersunk ring you will probably require a set of Norths and a set of Souths to achieve unlike poles attracting. We also offer Ferrite ring magnets.

If the magnets are attracting onto a ferromagnetic surface only, the any type of ring magnet (regardless of axial polarity direction) will be fine to consider using (combinations of Norths and Souths together will be fine - sometimes a N-S-N-S alternating pattern may give a small boost in performance if the magnets are close enough).  When we term a ring magnet North,  the countersunk face or counterbore face will be the North pole face (the other end will be the South pole face). When we state a ring magnet is a South, the countersunk face or counterbore face will be the South pole face (the other end will be the North pole face).

 

Model Variations

Product NumberDiameter (mm)Thickness* (mm)Hole sizeScrew head sizeWeight (g)Pull force (kg)Units per pack
N83215.43.253.3M34.403.55
N83417.5044.50M46.904.805
N833197.604.50M415.508.105
N82220106 CSKM621.404.71
N823373.56 CSKM627.54.91

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