Keyway Dimensions by Shaft Size
Shaft diameter drives standard key and keyway dimensions. Use the calculator for the exact shaft range rather than interpolating a table by eye.
keyway dimensions by shaft size shaft keyway dimensions shaft key size chart
Inputs
Start with shaft diameter and standard family. The calculator returns key width, key height, shaft keyseat depth and hub keyway depth.
After lookup
- Confirm the selected standard.
- Check torque and shaft stress.
- Confirm hub material and fit requirements.
- Specify tolerances on the drawing.
Caution
A standard keyway dimension is not a torque-capacity check. Weak hubs, short keys and fatigue-prone shafts still need design review.
Related pages
- Keyway dimension calculator - standard key and keyway dimensions.
- Shaft torsion formula - stress and angle-of-twist formulas.
- Shaft torsion calculator - run the actual shaft stress numbers.
- Overhung load calculator - check belt or sprocket side loads on the shaft.