Re: Thread size of Sturmey-Archer oil lubricator/nipple

On Aug 13, 6:18 pm, Barry Harmon <johnf...@xxxxxxxxxxxxx> wrote:
Zog The Undeniable <hrothga...@xxxxxxxxx> wrote in news:g7vdma$136b$1
@energise.enta.net:

I read elsewhere that this was 10-24, but it's much bigger than that;
measuring the major diameter of the lubricator thread gives almost 1/4",
and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI..

Can anyone confirm the thread is the most likely candidate for an early
20th century British component, i.e. BSC 1/4", before I go looking for a
suitable tap?  I'm putting one in the shell of a hub which currently
uses grease lubrication.

Thanks.

Here's a detailed reference on British fasteners.

http://www.enginehistory.org/BSFasteners/BSReference_3.pdfor the main
entry

http://www.enginehistory.org/british_fasteners.htm

You'll note that the English and Metric standards name by the size of the
wrench that fits the nut while the Whitworth standard names by the nominal
diameter of the bolt.  I.e., a 1/4 Whit is a bolt that's 1/4 in diameter
and 0.445 across the flats.

Jsut to confuse things, there is a standard called British Standard Cycle,
which was used on mototcycles.  I don't know if it was used on bikes.

Barry Harmon


Wow, I always wondered why a 1/4 inch wrench fit a nut that was almost
1/2 inch in size. I thought they were using a different inch, though I
couldn't find reference to that inch. Thank you for offering that
explanation!

Tom




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