When both dimensional and geometrical tolerances are needed, the drawing notation combines both classes. For example:
— Remember: Part 1 uses lowercase letters (f, m, c, v), while Part 2 uses uppercase letters (H, K, L). A drawing marked "ISO 2768-mK" is correct; "ISO 2768-MK" would be incorrect.
"In this case, Ø47.8mm and Ø52.5mm would be outside the acceptable range, and you would be within your rights to ask the supplier to remake them." iso 2768 general tolerances pdf exclusive
The standard is divided into two complementary parts:
Ensures consistent quality across different suppliers or internal production departments. Conclusion When both dimensional and geometrical tolerances are needed,
All values are in millimeters (mm). For nominal sizes below 0.5 mm, tolerances must be stated next to the specific nominal size. Tolerance Class 0.5 to 3 mm Over 3 to 6 mm Over 6 to 30 mm Over 30 to 120 mm Over 120 to 400 mm Over 400 to 1000 mm Over 1000 to 2000 mm Over 2000 to 4000 mm m (Medium) c (Coarse) v (Very Coarse)
Removes the need to label every single dimension with a +/- variance. "In this case, Ø47
— The standard explicitly excludes sizes below 0.5 mm. These must have individual tolerances indicated on the drawing.