r/Machinists • u/-Ihidaya- • 8d ago

QUESTION Help with threads please

Hi all,

I am trying to find a tap that can cut threads into brass or ss to receive a 13-425 glass vial or female threaded inserts (brass or ss). It doesn't seem to be a standard thread pitch option.

It may be close to a 13x2mm, but I'm not sure exactly.

It is to make metal threads to go onto lab vials like this that can handle heat: https://www.amazon.com/PEKYBIO-Liquid-Sample-Diameter-Leak-Proof/dp/B0BP6P8226/ref=sr_1_6?sr=8-6

I'd be grateful for any guidance. Thank you!

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u/TriXandApple 7d ago

Whats the application? You honestly might be better off just getting high temp plastic lids, boring a hole in whatever part you're working on, and epoxying the lid into the part.

Think about it, threads tighten up by stretching the thread. Glass is strong enough to stretch plastic, but it'll never be strong enough to stretch metal, so it'll never tighten.

One thing I can tell you for sure, you'll never find a tap.

Only other option is to get a full radius t slot cutter, about the side of the male thread form, and threadmill it.

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u/-Ihidaya- 7d ago

Thank you 🙏