A compact design reference for choosing and communicating dimensional tolerances in real machine assemblies. Use the separate terminology glossary for English–German equivalents.
The nominal size is the reference dimension. Upper and lower deviations define the permitted limits; the tolerance is their difference.
Maximum hole size: 50.30 mm. Minimum hole size: 50.10 mm.
TH = ES − EI = 0.30 − 0.10 = 0.20 mm
Carry this value into inspection planning and assembly clearance checks.
| Fit type | Design intent | Typical decision |
|---|---|---|
| Clearance fit | Always positive clearance | Guided sliding, serviceable assemblies |
| Transition fit | Clearance or light interference | Accurate location |
| Interference fit | Press or shrink assembly | Permanent hubs and bushes |