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I have been designing a prototype for a keychain that sprays perfume. I have a metal keychain piece which has a female thread and the plastic sprayer screws right into it and has a male thread.

I want to get these manufacturers ASAP but I need to be ensured it wont leak. I think I will switch my straight thread to a tapered thread, will that help?

What can I do to ensure that it will not leak?

Thanks!!

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  • $\begingroup$ wrap teflon thread sealing tape around the male part of the thread, screw the other part right over it $\endgroup$ – OpticalResonator Jun 1 '18 at 23:12
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tapered threads are intended to be leakproof, but the degree to which they resist leaks depends on how tightly they are screwed together. This generally requires the use of a tool of some sort, as it is usually not possible to tighten a tapered-thread joint enough by hand to make it stop leaking.

For this reason you should instead use straight threads and a gasket like a soft O-ring which is trapped between the two pieces when they are screwed together. Unlike the tapered thread joint, these can be tightened enough by hand to be leak-proof.

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