The ferrite magnet assemblies in this category have threaded bushing on opposite surface. They are classified as internal(female) threaded ferrite pot (mounting, holding) magnets. with internal threaded stud/boss/bushing on the back, screws and other parts with an female thread can be screw in. Ferrite is resistant to high temperature and corrosion, and the price is much cheaper, these benefits make internal threaded ferrite pot(mounting, holding)magnets to be ideal solution as alternative to neodymium magnetic system.
Common sizes for ferrite(ceramic) pot (holding, mounting) magnets with threaded bushing range from the smallest one of 10mm to the largest one of 125mm, and the pull force is various with the size. While 25mm, 32mm, 50mm, 63mm are the most popular size in the family of internal threaded ferrite pot magnets with threaded bushing.