1. The static load capacity of thin-walled shafts is determined by their loss of stability in torsion. 2. A method is suggested for calculating the stability of hollow smooth shafts and shafts with holes in torsion, with axial forces and centrifugal loads taken into account. 3. The high accuracy of the calculation of the stability moment by the suggested method was experimentally proved. The method may be used for shafts, springs, torsion bars, and pipes. 4. The reduction of the load capacity of thin-walled shafts with α=0.7−0.97 amounts to Ko=0.58−0.7 of the theoretical rupture moment in shear.