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: Using a global standard ensures that a manufacturer in China or Europe interprets your design requirements exactly as intended. Part 1: Linear and Angular Dimensions (ISO 2768-1)
Angles are treated specially. For a 90° angle on a large part, a ±0.5° tolerance is massive. ISO 2768-1 uses to determine tolerance.
| Nominal Size Range (mm) | Fine (f) | Medium (m) | Coarse (c) | Very Coarse (v) | |------------------------:|:--------:|:----------:|:----------:|:---------------:| | 0.5 – 3 | ±0.2 | ±0.2 | ±0.4 | ±0.4 | | >3 – 6 | ±0.5 | ±0.5 | ±1.0 | ±1.0 | | >6 | ±1.0 | ±1.0 | ±2.0 | ±2.0 | iso 2768 general tolerances pdf exclusive
"When applying these perpendicularity tolerances, the longer of the two sides forming the right angle shall be taken as the datum."
— The industry standard for most machined parts. c (coarse) v (very coarse) Table 1: Permissible Deviations for Linear Dimensions (mm) Nominal Length Range (mm) m (medium) c (coarse) v (very coarse) 0.5 up to 3 over 3 up to 6 over 6 up to 30 over 30 up to 120 over 120 up to 400 over 400 up to 1000 Source: ZEISS Quality Forum ISO 2768 PDF . Part 2: Geometrical Tolerances (ISO 2768-2) ISO 2768 Tolerance Standards for CNC Machining - JLCCNC : Using a global standard ensures that a
| Class | Name | Typical Application | |-------|------|---------------------| | | Fine | High-precision components, medical devices, precision instruments | | m | Medium | Standard CNC parts, housings, general-purpose machined components | | c | Coarse | Less critical parts, support structures, frames | | v | Very Coarse | Large industrial frames, rough components where precision is not critical |
| Nominal Size Range | f (Fine) | m (Medium) | c (Coarse) | v (Very Coarse) | | :--- | :--- | :--- | :--- | :--- | | 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 | — | | >3 up to 6 | ±0.05 | ±0.1 | ±0.3 | ±0.5 | | >6 up to 30 | ±0.1 | ±0.2 | ±0.5 | ±1.0 | | >30 up to 120 | ±0.15 | ±0.3 | ±0.8 | ±1.5 | | >120 up to 400 | ±0.2 | ±0.5 | ±1.2 | ±2.5 | | >400 up to 1000 | ±0.3 | ±0.8 | ±2.0 | ±4.0 | | >1000 up to 2000 | ±0.5 | ±1.2 | ±3.0 | ±6.0 | | >2000 up to 3000 | — | ±2.0 | ±4.0 | ±8.0 | ISO 2768-1 uses to determine tolerance
Standard PDFs from ISO cost around 150 CHF ($160 USD). Most engineers rely on second-hand tables or company internal documents. When searching for an , you want a version that is: