CNC Costify
Tolerance Desk
Shop-floor reference for CNC teams
ISO 286 — Limits & fits
Select H7 and a shaft class to see both limits instantly.
Common presets — click to apply
Fit result
Ø50 H7/g6
Hole limits · H7
50.000 – 50.025
EI 0 / ES +25 μm
Shaft limits · g6
49.975 – 49.991
ei -25 / es -9 μm
Clearance range
+9 – +50 μm
minimum – maximum
ISO 286 table values for 0.5–500 mm · negative clearance indicates interference.
Common fit selections
Start from intent, then verify actual limits.
| Fit | Type | Typical use |
|---|---|---|
| H11/c11 | Loose running | Dusty parts or large temperature change |
| H9/d9 | Free running | Slow rotation and general mechanisms |
| H8/f7 | Close running | Spindles and controlled sliding fits |
| H7/g6 | Precision running | Precise rotation with small clearance |
| H7/h6 | Locational clearance | Accurate location and hand assembly |
| H7/k6 | Transition | Accurate location, light assembly force |
| H7/n6 | Medium press | Gears, bushes and fixed components |
| H7/p6 | Press fit | Permanent joints and torque transfer |
Engineering note: This is a manufacturing reference tool. The drawing, customer specification and the project-specified edition of each standard always take precedence. Unnecessarily tight tolerances increase machining and inspection cost.