If a design includes both general dimensions and a critical shaft-hole fit, ISO 2768 can be applied to the general dimensions while ISO 286 tolerances are specified individually for the mating features.
Quality control inspectors can reference a single standard table rather than individual drawing notes. Part 1: Linear and Angular Dimensions (ISO 2768-1)
These values limit the bowing or surface warping of a face or axis across its longest nominal length. Tolerance Class Up to 10mm 10 to 30mm 30 to 100mm 100 to 300mm 300 to 1000mm 1000 to 3000mm K L 2. Perpendicularity iso 2768 general tolerances pdf exclusive
±30' for lengths up to 50mm.
⚠️ For nominal sizes below 0.5 mm, the deviations must be indicated adjacent to the relevant nominal size on the drawing. If a design includes both general dimensions and
A standard drawing callout combines both parts, specifying a dimensional class followed by a geometrical class, such as ISO 2768-mK or ISO 2768-fH . ISO 2768-1: Linear and Angular Tolerance Tables General Tolerance - ISO 2768 1 & 2 - ZEISS Quality Forum
Blueprints are easier to read because non-critical dimensions do not have individual tolerance callouts. Tolerance Class Up to 10mm 10 to 30mm
Let me know the material you are working with or if this is for plastic or metal components , and I can provide tailored advice. General Tolerance - ISO 2768 1 & 2 - ZEISS Quality Forum
The standard defines four tolerance classes, ranging from tightest to loosest:
When a drawing references "ISO 2768," it means that any dimension lacking a specific, localized tolerance must adhere to the generalized values defined by this standard. This drastically simplifies engineering blueprints, reduces drafting time, and streamlines quality control.
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