Neodymium Disc Magnets
Ideal where compact size with maximum strength is required
Strong magnet ideal for screw mounting holding and attaching uses
Overview - Neodymium Ring Magnets
A ring magnet or NdFeB ring magnet is a NdFeB disc magnet with a concentric hole inside it. A Neodymium 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 is a ring magnet with a cylindrical flat-bottomed hole on one side that enlarges the main central hole to take a cap head screw.
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 magnetized - the magnet is magnetized 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.
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 state a ring magnet is a 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).
|Product Number||Diameter (inches)||Diameter (mm)||Thickness* (inches)||Thickness* (mm)||Hole size (inches)||Hole size (mm)||Screw head size||Pull force (lbs)||Pull force (kg)||Units per pack|
|N822||0.79||20.0||0.39||10.00||6 CSK||6 CSK||M6||10.4||4.7||1|
|N823||1.46||37.0||0.14||3.50||6 CSK||6 CSK||M6||10.8||4.9||1|
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