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Ring Ferrite speaker magnets Machining and tolerances Ferrite magnets are very hard and brittle,consequentlymachining must be done with a diamond wheel, and is easier when done prior to magnetization.Standard tolerances forFerrite magnet dimensions are +/-.005" for ground dimensions and +/- 2% of feature size for as sintered dimensions. Because of their brittleness these magnets will not withstand impact or flexing. We recommend that they not be used for structural purposes.Ferrite magnets are chemically inert non-conductors, which is a benefit in many applications. However, this feature does eliminate the use of the EDM process to produce samples or special shapes