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Shrink-Fits Assembly

Assembly temperatures for shrink-fits.

Shrink-fits are assembled by heating them to temperatures where the expansion exceeds the interference. Required heating temperature can be calculated as

dt = δ / α di                               (1)


dt = temperature heating (oC, oF)

δ = diametric interference (mm, in)

α = coefficient of linear expansion (m/moK, in/inoF)

di = initial diameter of hole before expansion (mm, in)

Diametric interference can be calculated as

δ = dt α di                               (2)

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