This is a ring magnet (round with hole) for use in high temperature environments, with an outside diameter of 27.7mm, a hole of 20.7mm, and a height of 8mm, which is a customized size. This magnet has excellent corrosion resistance and requires no coatings or surface treatments, which makes it very popular in the field of adsorption and communication in a variety of instrumentation, high-temperature furnaces, and so on.
Aluminum nickel cobalt related knowledge articles;
Temperature coefficient for cast and sintered Alnico 5 6 8
Which is better, ceramic magnets or alnico magnets?