"Exactly," Elias said, leaning back. "The part measures 150.6. The nominal is 150. The upper limit is 150.5. We are 0.1 mm out of tolerance."
| Tolerance Class | Straightness & Flatness (mm per 100 mm) | Perpendicularity (mm per 100 mm) | Symmetry & Runout (mm per 100 mm) | |----------------|------------------------------------------|-----------------------------------|------------------------------------| | | 0.2 | 0.3 | 0.2 | iso 2768-m tolerances
deals more with the detail specification of fits and tolerances for features of size and geometric features. It's more commonly referenced when detailed specifications are required. "Exactly," Elias said, leaning back
ISO 2768-2 (Geometrical tolerances like flatness, straightness, and run-out). LEADRP +1 2. ISO 2768-1: Linear Dimensions (Class m) For linear dimensions (lengths, diameters, etc.), the "m" class provides a balanced range of accuracy suitable for general engineering and automotive applications. The allowable deviation increases as the size of the feature increases: 3ERP +1 Nominal Size (mm) Tolerance (± mm) 0.5 to 3 ± 0.1 Over 3 to 6 ± 0.1 Over 6 to 30 ± 0.2 Over 30 to 120 ± 0.3 Over 120 to 400 ± 0.5 Over 400 to 1000 ± 0.8 Data sourced from LEADRP and 3ERP . 3. Key Geometric Features (Class K) When "K" is paired with "m", it specifies medium-level geometric controls. These ensure the part's shape is functional without over-engineering: LEADRP Straightness and Flatness The upper limit is 150
Or, in long form: