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Fusion360 custom thread profile for soft drinks bottles (PCO1881 spec). Unzip to Users"USERNAME"AppDataLocalAutodeskwebdeployproduction"CURRENT VERSION"FusionServerFusionConfigurationThreadData

Note: You'll need to change "USERNAME" and "CURRENT VERSION" to match your own install. The current version should be the one with the latest date stamp.

V2 internal thread (the 'cap' thread) is a little tight and might need working on and off a few times, V3 is a bit looser. Neither will provide an air/watertight seal though so you'll need to model in a gasket or o-ring of some sort to stop it leaking.

V4 and V5 use shallower thread angles and a whitworth thread. I've not had chance to print and test them yet so use at your own risk.

The documentation for creating a square thread via this process is sadly lacking, so I've been unable to create a square profile thread. This is not a perfect recreation; the official thread spec calls for a more rounded square thread profile and the printed thread is triangular.

Edit: If Fusion 360 updates and you no longer have the PCO threads listed in the thread tool you'll need to move them from the old location to the new one. Both folder will be in the same place; Users"USERNAME"AppDataLocalAutodeskwebdeployproduction just look at the creation dates of the folders to find the latest and previous ones.