Plastic snapfit fastener design

This paper presents a systematic procedure for selecting and designing snapfits integrated into plastic parts. A classification is proposed based on the geometry of the parts to be assembled and the ease of dismantling. The part geometry influences the type and shape of the snapfit. Depending on the space available, recommendations are made for choosing from a classical straight beam shape, a tapered shape, an “L” shape and a “U” shape. The snapfit fastener may be separable if so designed. A distinction should be made between: dismantling with or without a tool (screwdriver or specialised tool); access to the insertion face only; access to insertion face and opposite or lateral faces.