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, BricsCAD, ZWCAD, ProgeCAD).