In modern Geometrical Product Specifications (GPS), newer standards like ISO 22081:2021 are beginning to replace older general tolerance methods by providing rules for general geometrical and size specifications to minimize individual indications on documentation. How to Reference MS81-2021 on Drawings
When engineers create technical drawings, they don't always specify a tolerance for every single dimension to avoid clutter. Instead, they refer to a "General Tolerance" standard. The MS81-2021 (Revision 2) serves as the primary annex for general tolerances in machine-cut operations within specific corporate standards like MSF1-2021. Ms81-2021 Standard Pdf
: The standard class used for most general machining. c (Coarse) : For parts where precision is less critical. The MS81-2021 (Revision 2) serves as the primary
Summary for Manufacturers
: This standard applies to machining dimensions of less than 2000 mm for individual machining work. Summary for Manufacturers : This standard applies to
According to the Standard Drawing Format, the tolerance should be clearly designated in the title block of the engineering drawing. A typical callout would look like: