Class OCCTParts

Standard parts made from their sizes, so a part is asked for by what defines it, such as a gear's module and teeth, a screw's thread size and length or a bearing's designation, instead of being drawn, grouped by discipline: mechanical holds gears, fasteners, springs, bearings, keys, retaining rings and machining. Each part also comes as a twin whose faces are named by the part they play, with the frames it is placed by.