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strange tap 0.8125 x 48 NS

emlclcy

Plastic
Joined
Jul 29, 2013
Location
england hampshire
I bought a job lot of reamers and drills from a chap yesterday and in the box was a tap, it has 0.8125 48 NS engraved, it has as you can imagine a really fine thread.
any ideas what this would have been used for?
cheers
carl
 
Propriety thread so you have to buy their repair parts. Starrett does this a lot.

BTW, that's 13/16", spot on.

Or they just needed a real fine thread at that diameter. Optical work, perhaps. Threaded, thin wall tubes?
 








 
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