Neodymium Ring Magnet 20 x 5 x 5 mm N35 Diametrically Magnetised
 
An NdFeB (neodymium) ring magnet provides high magnetic attraction for its size and fits readily into various holders and components. It is much stronger than conventional ferrite magnets and generally has a protective coating because the material can corrode over time. N35 indicates the magnetic grade. NdFeB grades commonly range from N35 to N52, with higher numbers generally indicating stronger magnets. diametrically magnetised ring: the poles are on the inner and outer surfaces, so the field direction differs from a conventional ring magnet magnetised through its thickness.
 
A good choice where stronger holding force and a radial magnetic field are required. (Ø20/Ø5×5 mm) Popular in technical projects involving rotating components, sensors and positioning on shafts where a radial field is needed. Holding force depends strongly on the thickness and condition of the metal surface. It is greater on thick steel and weaker on thin sheet metal.
 
Warning: not suitable for children. Swallowed magnets can cause serious injuries. Seek urgent medical attention. Magnetic attraction is strong. Bring magnets together and separate them carefully to avoid pinching injuries and chipping. Keep them away from medical devices, cards and sensitive electronics.