إن Bearing Interference Fit & Thermal Expansion Calculator is a practical engineering tool for evaluating bearing interference fits and dimensional changes caused by temperature variations. By considering shaft diameter, housing dimensions, material properties, temperature differences, and fit conditions, the calculator helps engineers estimate thermal expansion and determine an appropriate bearing fit. The Bearing Interference Fit & Thermal Expansion Calculator supports accurate bearing installation, mechanical design, and maintenance while helping reduce the risk of excessive interference, bearing looseness, deformation, overheating, and premature failure.

Bearing Interference Fit & Thermal Expansion Calculator

Input parameters

1 Bearing geometry

F and E auto-fill from Harris/SKF proportions F ≈ 0.25(D + 3d), E ≈ 0.25(3D + d) unless you type over them.

2 Shaft / inner-ring fit (ISO 286 + ISO 492)

Inner-ring bore uses ISO 492 Normal (PN/P0) limits (0 / minus). Shaft class is ISO 286.

3 Housing / outer-ring fit
4 Shaft structure & materials
5 Temperatures

Heating temperature Theat is calculated so the inner-ring bore expands by Iالأعلى plus a mounting safety of max(0.02%·d, 15 μm).

6 Initial radial clearance (ISO 5753-1)