How to design the plastic caps, i mean how much dia should be kept (thread OD in bottle & thread ID in cap, insertion dia of cap) in cap for proper engangement

i want to know how to design the plastic cap, all about the dimensions and tolerance to be kept to be kept in mind before designing the plastic cap given if we have the bottle

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Hi there, consumer grade caps for things like toothpaste, shampoos, and bottles often have double-start threads. This allows for further travel with fewer rotations of the cap. Clearances are similar to their single-start equivalent

 
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