Snap fit

From WikID

A snap-fit is a mechanical joint system where part-to-part attachment is accomplished with locating and locking features (constraint features) that are homogenous with one or the other of the components being joined. Joining requires the (flexible) locking features to move aside for engagement with the mating part, followed by return of the locking feature toward its original position to accomplish the interference required to latch the components together. Locator features, the second type of constraint feature, are inflexible, providing strength and stability in the attachment. Enhancements complete the snap-fit system, adding robustness and user-friendliness to the attachment. (Bonenberger, P.R., "The First Snap-Fit Handbook: Creating Attachments for Plastics Parts". Munich: Carl Hanser Verlag, 2000.

Snap fit design, a web page by Paul E. Koch, Pennsylvania State University

Snap fit design tool by BASF You have to register first but that is free.

Power point presentation on snap fits by Will Lark, MIT

Example of a snap fit type