[AT] Supposedly why our old tractors are not metric and a fairly simple tutorial

[Stephen Offiler]

Speaking of fittings - this probably won't be totally comprehensive,
worldwide, but the info contained in this link has been adequate to get me
by every time I am confronted by some oddball fitting.  From this link you
still need to hit, at the top of the page, "How To Identify And Measure
Fittings"

https://www.mcmaster.com/standard-metal-pipe-fittings/=cde88b1872814775b41abc201f70a579k71xsig6

SO



On Mon, Feb 24, 2020 at 9:17 PM John Hall <jtchall at nc.rr.com> wrote:

> Fun fact. Did you know metric pipe threads are actually in inches? They
> are actually 55 deg threadform (British Whitworth) but the pitch is in
> metric. And the real fun part is that the rest of the planet can't even
> decide how to spec them on drawing/print/blueprint. Different countries
> have different designations for the same thing. Off the top of my head,
> I think there are a combined 7 different ways of designating metric pipe
> threads (taper and straight), as opposed to just 2. Now we won't split
> hairs with short projection, dryseal or other specialty threads--lets
> stick to 99.999% of pipe threads.
>
> FWIW, I have 30 years in a machine shop and have continually used both
> english and metric without an issue. Its the rest of the planet that
> makes a big ordeal out of it, we just grab a print and go with it.
> English, German, Japanese--its all the same--until we have to use
> Translate Google to figure out the notes.
>
> One more fun fact. Next time you need some roller bearings for your old
> tractor and start measuring them only to find they aren't exactly
> english, convert them to metric--you might ought to sit down first.
>
> I won't even get into European conduit threads--I've only had to do them
> twice.
>
> John Hall
>
>
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