Need radial 2 poles (1N1S) magnetic ring, we have a large number of ferrite and neodymium material to provide, support the size and performance of customized. What you are viewing here is a ring magnet that is magnetized through the diameter direction. It looks like a ceramic ferrite, but it is not. It is made of bonded neodymium ferrite boron, the surface black is black epoxy coating, outer diameter 13mm. inner hole 8mm, thickness 3.5mm, there are ready-made samples, welcome to inquire.
13x8x3.5mm radial 2-pole neodymium magnet ring sample and magnetic pole distribution display
It may be a better fit for your size;
13.8 x 2 x 4mm thick radial 24 poles injection mold ferrite magnet