Choosing Fits in Machining: Clearance, Transition and Interference
Three Fit Types
Hole-shaft fits are clearance, transition or interference - deciding motion, centering or fastening.
Comparison
- Clearance: Hole larger - relative motion (slides, guides)
- Transition: Slight clearance or interference - good centering, serviceable (dowels, gears)
- Interference: Shaft larger - press fit for torque (bearing outer ring into housing)
How to Choose
- Rotating or sliding - clearance
- Precise coaxial and removable - transition
- Torque and anti-loosening - interference
- Consider load, temperature and material
Strut Mount Examples
- Bearing to housing: slight interference to stop axial creep
- Core to tube: transition or interference by function
- Bolt holes: clearance for assembly
Huami Tip
Wrong fit means hard assembly or early loosening - Huami fully inspects critical fits.