Geometric designs and strength checks of shaped connections of shafts with hubs (parallel side keys, Woodruff`s keys, straight-sided splines, involute splines). Application is developed in MS Excel, is multi-language and supports Imperial and Metric units. Is based on ISO, SAE, DIN, BS and JIS standards and support many 2D CAD systems (AutoCAD, AutoCAD LT, IntelliCAD, Ashlar Graphite, TurboCAD).