: It eliminates the need to label every single dimension with a tolerance, making technical drawings cleaner and easier to read.
: It ensures that parts produced across different shifts or by different suppliers meet the same quality and fitment requirements. Scope and Classification
: Specific tolerances for stamped or pressed sheet metal parts. Accessing the PDF
: Suppliers usually access these via the manufacturer's dedicated B2B quality portals.
If you are working outside the Mitsubishi ecosystem, you might find that is the most comparable international standard. Many corporate "MS" (Motor Standard) documents are adapted from ISO 2768-1 (for linear/angular dimensions) and ISO 2768-2 (for geometric tolerances). Ms812021 Standard Pdf -
The 2021 revision (often labeled ) applies to machining dimensions of less than 2,000 mm. It breaks down tolerances into specific classes: Tolerance Class Description Typical Application Class f High-precision components with tight fitment needs. Class m General engineering parts; the most common default. Class c Non-critical structures or rough-cut components. Key Technical Specs
: External and internal sizes, diameters, and radii. Angular Dimensions : Machined angles and corner roundings.
The MS 81 series provides standardized guidelines for . In industrial manufacturing, if a specific dimension on a drawing does not have an individual tolerance listed, engineers look to this standard to determine the acceptable range of deviation.
