Geometric design and strength check of couplings using pins and clevis pins. Application is developed in MS Excel, is multi-language and supports Imperial and Metric units. Is based on ANSI, ISO, DIN, JIS, BS and CSN standards and support many 2D CAD systems (AutoCAD, AutoCAD LT, IntelliCAD, Ashlar Graphite, TurboCAD, BricsCAD, ZWCAD, ProgeCAD)