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H7 Shaft Fit Calculator
Enter nominal size and pick the shaft grade — fit type and limits appear instantly.
Formula
Hole H7: 0 / +IT7 | clearance max = ES − ei | clearance min = EI − es
Fit Selection Guide (H7 hole)
| Shaft | Fit | Typical use |
|---|---|---|
| g6 | Clearance | Sliding shafts, spigots |
| k6 | Transition | Gears on shafts with key |
| n6 | Transition (tight) | Rigid pins, dowels |
| p6 / s6 | Interference | Press-fit bushings, bearing seats |
FAQ
How do I choose a fit?
Need parts to move? g6. Need accurate location with easy assembly? k6. Needs to never move (pressed bushing)? p6 or s6 with hydraulic/hot pressing.
Is this calculator standards-exact?
It uses published IT6/IT7 and fundamental-deviation tables for 0–250 mm — matches ISO 286 for the common H7 shaft fits shown.