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: On older technical drawings, you may see references to "1st Class" or "2nd Class" tolerances. Under modern enforcement, these older designations are often mapped to the Annex MS81-2021 requirements. Key Technical Specifications
Summary for Manufacturers
: The standard typically categorizes precision into three main classes: f (Fine) : For high-precision components. Ms81-2021 Standard Pdf
: The standard class used for most general machining. c (Coarse) : For parts where precision is less critical. : On older technical drawings, you may see
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