Interference Fit Formula

An interference fit also known as a press fit or friction fit is a form of fastening between two tight fitting mating parts that produces a joint which is held together by friction after the parts are pushed together.

Interference fit formula. It is used in non mating assemblies like bearing bushes fitted into the bearing housing key fitted into the keyway etc. Press fit assembly bushing mount computation. Lets look at the interference fit. Transition fit is of two kinds namely push fit and light keying fits.

The standard fit cannot exceed limits for maximum and minimum interference. That is sometimes the shaft is slightly larger than the hole and sometimes slightly smaller than the hole. In the press fit case assembly operation is done with large amount of forces. Lets look at the interference fit.

Suitable assembly method shall be selected between shrink fit and press fit. If the corresponding fit cannot be selected the deviations are numerically expressed and calculated by dividing the tolerance field into two halves. Transition fits are a compromise between clearance and interference fit where a small amount of either clearance or interference is permissible. Joint pressure in the friction surface is necessary for the torque force transmission and this pressure is generated by the deformation of shaft and hub.

An interference fit press fit shrink fit is a frictional shaft hub connection.