A wide application of shaft-to-sleeve connections in the form of gear structural components causes the need in finding the ways to increase their quality and efficiency of use. Spline connections are the most widely applied in gears, both straight-sided ones with a zero profile angle and the involute ones with a profile angle of 30. As a production item it is a knowledge- and labour-intensive gear component with increased requirements to the manufacture and reliability quality. The key type of such connections' failure - spline collapse as it is shown, for example, in (Fig. 1).