[Healeys] One for the thread guys

[Michael Salter]

I don't have a 55 degree 16 TPI thread gauge but my 60 degree seems to be a
very good fit.

On Sun., Jun. 2, 2024, 12:45 p.m. , <m.g.sharp at sympatico.ca> wrote:

> Bit of a stumper Mike.  Tracy tools, my go-to source for taps and dies,
> sell a tap that is 5/8”x16 with a “UNS” thread form
> https://www.tracytools.com/product/5-8-x-16-tpi
>
> I am unfamiliar with UNS but believe it is the abbreviation for Unified
> National Special, suggesting it is non-standard thread.  Looks like a bit
> of a rabbit hole and I am curious to see what others find.
>
>
>
> *From:* Healeys <healeys-bounces at autox.team.net> *On Behalf Of *Michael
> Salter
> *Sent:* Sunday, June 2, 2024 10:26 AM
> *To:* healeys at autox.team.net
> *Subject:* [Healeys] One for the thread guys
>
>
>
> The thread on the flare nut used to secure the temperature bulb into the
> head on later 6 cylinder engines is 5/8" diameter and 16 TPI.
>
> Is this some sort of standard thread or a "special"?
>
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