The tolerance ISO norm is very popular for metal sheet parts, precision machining parts, and plastic injection parts designing. It is also available as a DIN standard in Germany, helping manufacturers and customers communicate effectively by providing clear and measurable criteria for acceptable variation.
- General tolerances - Part 1: Tolerances for linear and angular dimensions
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| Range of Nominal Sizes (mm) | Fine (f) | Medium (m) | Coarse (c) | Very Coarse (v) | | :--- | :--- | :--- | :--- | :--- | | 0.5 up to 3 | ±0.2 | ±0.2 | ±0.4 | ±0.4 | | >3 up to 6 | ±0.5 | ±0.5 | ±1.0 | ±1.0 | | >6 up to 30 | ±1.0 | ±1.0 | ±2.0 | ±2.0 |
Permissible deviations for broken edges:
Used for low-precision parts or rough manufacturing processes. The tolerance ISO norm is very popular for
While Part 1 handles "how big" a part is, Part 2 handles "what shape" it is. It focuses on features like flatness, symmetry, and circular run-out. It uses three classes: .
By applying this standard, engineers can simplify their blueprints. Instead of labeling every feature with a plus/minus ( ±plus or minus
If only linear tolerances are required, you may simply write: ISO 2768-m . This link or copies made by others cannot be deleted
Do not simply write "ISO 2768" without indicating the class (e.g., f, m, c, v for Part 1 and H, K, L for Part 2).
Understanding ISO 2768 General Tolerances: A Comprehensive Guide (PDF Available)
: Indicates that the drawing adheres to this international general tolerance standard.
Focuses on linear and angular dimensions. It specifies four tolerance classes: (very coarse) Part 2 (ISO 2768-2):
Press fits, sliding fits, and bearing seats require precision tolerances (like ISO limits and fits, e.g., H7/g6) that general tolerances cannot guarantee.