Deep Groove Precision Ball Bearings | AST
More specifically, precision ball bearings called Super Precision (MM) are typically manufactured to ABEC-7 (ISO-P4) tolerances.Ultra Precision (MMX) bearings are usually manufactured to ABEC-9 (ISO P-2) tolerances.However, so-called Super High Precision (MMV) bearings are manufactured partly to ABEC-7 tolerances, but also partly to …
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