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Designing thread for plastic bottle.

Designing thread for plastic bottle.

Designing thread for plastic bottle.

(OP)
Hello, I'm trying to design threads for a plastic bottle with a 24/400 neck finish. I have the specs for "SP-400 Finish for Plastic Bottles" which indicates a standard pitch of 8 threads per inch, but what I'm getting hung up on is the spec for the helix angle (2.56). Given the pitch and the thread diameter, doesn't the helix angle become reference?

RE: Designing thread for plastic bottle.

(OP)
Okay that's what I thought. Thanks!

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