Molded-in threads can be designed into parts made of engineering thermoplastic
resins. Threads always should have radiused roots and should not have feather
edges – to avoid stress concentrations.
Figure 35 shows examples of good design for molded-in external and internal threads. For additional information on molded-in threads, see page 105. Threads also form undercuts and should be treated as such when the part is being removed from the mold i.e., by provision of unscrewing mechanisms, collapsible cores, etc. Every effort should be made to locate external
threads on the parting line of the mold where economics and mold reliability are
most favorable.
Product and Mold Design
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