The picture shows a 12mm diameter rare earth samarium cobalt permanent magnet, hole inner diameter 3mm, height 6mm, belongs to the high temperature magnet series, can be plated or not plated, the default axial magnetization, mainly used in some high temperature environments (> 200 ℃), can be done according to your requirements for the adjustment of the size, grade, tolerance, welcome to consult the purchase!
Sinker ring magnet magnetization diagram;
You may be curious;
Why ring neodymium magnets need to process countersunk hole shape?