What is the thread pitch used on NZ PET Bottles (e.g 1.5L Coca Cola Bottles)

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sfrasernz

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#312880 26-May-2024 10:12

Working on a small project with the kids building water rockets with 3D printed parts. Does anyone know the thread pitch used on 2L and 1.5L bottles in NZ? I've got a a few at home (Coke and Kiwi Blue) and they're using the same pitch. I tried a part from Thingiverse but its not right.

Failing that I'll have to learn how to measure the thread and figure it out myself!

Edit:

Found this which looks promising

https://www.printables.com/model/262018-pet-bottle-pco28-1810-thread-standard-models

graham007

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#3234753 26-May-2024 10:46

from online source :

The thread pitch on a standard 2-liter Coca-Cola bottle, which typically uses a PCO 1881 or PCO 1810 neck finish, is usually standardized across most countries, including New Zealand. For the PCO 1881 neck finish, the thread specification is as follows:

Thread Type: PCO 1881
Thread Pitch: Approximately 2.5 mm
For the PCO 1810 neck finish:

Thread Type: PCO 1810
Thread Pitch: Approximately 3.18 mm
These specifications are widely used in the beverage industry to ensure compatibility with standard caps and closures. If you need precise measurements for a specific application, it's best to consult the bottle manufacturer or a technical drawing for exact details.

eracode

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#3234776 26-May-2024 13:10

Sorry not able to help with your specific question but we built several different types of water rockets and launch/release systems when our son was at primary school 30 years ago. We produced some pretty respectable flights - massive amount of fun.

I’d be keen to hear how you get on with all of this.

Sometimes I just sit and think. Other times I just sit.

neb

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#3235016 26-May-2024 19:20

Another way to launch them is to use them as bullet traps for gas-powered spud guns. You run the bottle down the muzzle of the spud gun and the impact of the spud launches the bottle off the end of it.