INDUNECT / ENGINEERING TOOLS / MD-003

Hub, key & shaft connection.

Check a single parallel-key torque connection for tangential force, key shear, bearing pressure, required effective length, torque capacity, gross-shaft torsional stress and basic hub/keyway geometry.

BETA / REFERENCESINGLE PARALLEL KEYALLOWABLE-STRESS INPUTSREPORT READY

01Torque & shaft

Design torque = nominal transmitted torque × service factor. The tangential force at shaft radius is F = 2T/d. Gross-shaft torsional stress is shown only as a nominal reference; it does not include keyway stress concentration.

Nominal transmitted torque N·m

Service factor ×

Shaft diameter d mm

Shaft keyway depth t1 mm · geometry only

Design torque—

Tangential force—

Nominal gross-shaft torsion—

02Key geometry & allowables

Enter the actual standardized/project key dimensions. Effective bearing height is the contact height used by your chosen design method; MD-003 does not assume that the full key height carries uniform bearing pressure.

Key width b mm

Key height h mm

Selected effective key length l mm

Effective bearing height teff mm

Allowable key shear stress MPa

Allowable bearing pressure MPa

Key shear stress—

Bearing pressure—

Governing required length—

03Hub geometry

These are geometry sanity checks only. Positive wall thickness does not prove hub strength; hub splitting/bursting, local keyway stresses, fatigue and interference-fit stresses require separate analysis.

Hub outside diameter D mm

Hub axial length mm

End margin each side mm

Hub keyway depth t2 mm · geometry only

Max usable key length—

Hub radial wall—

Wall beyond keyway root—

04Report metadata

Project optional

Client optional

Prepared by optional

Calculation reference optional