Shrink-fit assembly
Press, shrink, and cryogenic fittings

Typically, shrink-fit assembly consists of joining a ring and a shaft, with the initial inside diameter 2r₁ of the ring being slightly smaller than the initial outside diameter 2r₁ + s of the axis. The difference s between these two quantities corresponds to tightening the ring on the shaft, the ratio s/2r₁ refers to the proportional clamping, noted A. Depending on the shrink-fit application, this proportional tightening can range from one ten-thousandth to a few thousandths.