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Posted by on January 27, 2008, 2:16 pm
Please log in for more thread options > Tim Leech wrote:
> > wrote:
>
> >>campingstoveman wrote:
>
> >>>Gentlemen,
>
> >>>Can anyone tell me the tapping size of a 11/16ths UNF tap, I know its a
> >>>bastard size, I have bought a tap but none of my books give a drill size for
> >>>it.
> >>>Its for Landrover track rod ends.
>
> >>>Martin P
>
> >>MH gives, for 1-1/2D to 3D depth of engagement as between 0.651-0.655"
> >>so 21/32" drill is pretty close @ 0.65625"
>
> >>Tom
>
> > What is the pitch? 5/8" is 18 tpi, 3/4 is 16.
>
> > I've got an 11/16" UNS tap, 16 tpi, in my hand which is marked 'use
> > 5/8" drill'.
>
> > Tip
>
> Missed the UNS, not UNF is it? :-)
>
> Tom- Hide quoted text -
>
> - Show quoted text -
Tom
Yes, I think it should be UNS at 16TPI, at least that is what the
LR4X4 forum thinks it is. I suspect the chart I quoted was actually a
missprint and called it UNF instead of UNS. It is also a fairly common
size used on some plumbing fittings so I suppose it could be called
"special". As UNS it is listed fairly often with the tapping drill at
5/8", as of course is 11/16UNEF at 24TPI with a tapping drill of
16.6mm.
Regards
Keith
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