Shaft-hub connection

DIN 7190-1 Interference Fit Calculator

Calculate joint pressure, elastic limits, and frictional torque and axial capacities.

DIN7190-1

Geometry, materials, and friction

Fit diameter DF

Joint length lF

Inner-part bore DiI

Outer-part diameter DaA

Interference U

Inner roughness RzI

Outer roughness RzA

Inner Young's modulus

Outer Young's modulus

Inner Poisson ratio–Outer Poisson ratio–Inner yield strength

Outer yield strength

Inner safety–Outer safety–Torque friction coefficient–Axial friction coefficient–Slip safety Sr–

DIN 7190-1:2017 · purely elastic, cylindrical

Purely elastic verification

Review inputs and calculate joint pressure.

Friction from interference

What this calculator does

Interference, joint geometry, materials, roughness, and friction coefficients produce contact pressure plus axial and torque capacity.

Elastic joint pressure connects interference, material, and geometry. Reliable realization also depends on roughness, form, cleanliness, lubrication, and the joining process.

Typical tasks

Rotor and gear hubs
Keyless torque transfer
Thermally assembled bushes and rings

Design notes and follow-up standards

Check before release

Joining process

Plan assembly temperature or pressing force to avoid galling and surface damage.

Combined load

Axial force and torque share available friction; do not use both individual capacities in full.

Edges and rotation

Edge peaks, alternating bending, and centrifugal force can require an extended assessment.

Useful follow-up standards

ISO 286

Set manufacturing tolerances so minimum and maximum interference match the verification.

ISO 1101

Control form and location deviations of mating surfaces.

DIN 7190-2

For tapered self-locking interference fits rather than cylindrical interfaces.