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Snaps allow an easy method of assembly and disassembly of plastic parts.
Snaps consist of a cantilever beam with a bump that deflects and snaps into a groove or a slot in the mating part. Here we consider the general case of a beam tapering in both directions. The disassembly force is a function of the coefficient of friction, which ranges from 0.3 to 0.6 for most plastics. The coefficient of friction also varies with the surface roughness. The rougher the surface, the higher the coefficient of friction.