[Healeys] One for the thread guys

[m.g.sharp at sympatico.ca]

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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