Martin Evans wrote:
> On Mon, 07 Aug 2006 18:26:19 GMT, "Jim" <[email protected]>
> wrote:
>
> >Gee, here I thought that everybody knew that a 10-24 bolt has a 3/16 inch
> >shank with 24 threads per inch.
>
> Well having grown up around BSW/BSW/UNC/UNF/BA *and* Metric I for one
> knew the 24 was the tpi but I didn't have a clue and still don't as to
> what the 10 means.
>
> From what you say It's clearly not 10/64" or 10/32" or 10/16" 10/8" or
> 10/4"
>
> 10 gauge(swg) is about 3.2mm or just over 1/8" so its not that either
> 10 gauge (awg) is 0.1019" so its not that, nor is it 10 gauge
> (shotgun) as that is 0.777 inches
>
> And some say metric is complicated?
Americans experienced the same problems from lack of thread
standardization that Britain did. The challenge was taken up by William
Sellers, scion of an eminent family of American "mechanicians,"
whose grandfather had made the plates with which the Continental
Congress printed its currrency. In 1864, a committee of the Franklin
Institute recommended the adoption of Seller's system of screw
threads. The thread form became known as the "Franklin thread," or,
more commonly "Seller's thread," and later as the "United States
Standard Thread." It became the basis of the French standard thread,
and then of the Syst=E8me International thread. In May 1924 it was
designated the "American Standard Thread." In 1907 the American
Society of Mechanical Engineers (ASME) defined two series that used
Seller's thread, numbering the sizes by gage numbers from 0 to 30. In
the series the major diameter started at 0.060 and increased by 0.013
inch with each size from 0 to 10, and by 0.026 inch between gages above
#10.
Shamelessly cribbed from www.sizes.com
So number 10 is 0.060" + 10 x 0.013" or 0.190", about 3/16" ie.
0=2E1875".
Interestingly enough, modern screw charts show #12 as 0.216 and #14 as
0=2E242 which means that at some point after 1907 the 0.026" increment
was dropped and 0.013" used above #10 too: #10--0.190, #11--0.203,
#12--0.216, #13--0.229, #14--0.242
On Mon, 07 Aug 2006 18:26:19 GMT, "Jim" <[email protected]>
wrote:
>Gee, here I thought that everybody knew that a 10-24 bolt has a 3/16 inch
>shank with 24 threads per inch.
Well having grown up around BSW/BSW/UNC/UNF/BA *and* Metric I for one
knew the 24 was the tpi but I didn't have a clue and still don't as to
what the 10 means.
From what you say It's clearly not 10/64" or 10/32" or 10/16" 10/8" or
10/4"
10 gauge(swg) is about 3.2mm or just over 1/8" so its not that either
10 gauge (awg) is 0.1019" so its not that, nor is it 10 gauge
(shotgun) as that is 0.777 inches
And some say metric is complicated?
--
On Mon, 07 Aug 2006 18:26:19 GMT, "Jim" <[email protected]>
wrote:
>Gee, here I thought that everybody knew that a 10-24 bolt has a 3/16 inch
>shank with 24 threads per inch.
But not everybody lives in America and lives by their rules. <g>
On Wed, 09 Aug 2006 22:49:31 +0100, Martin Evans
<[email protected]> wrote:
>On Mon, 07 Aug 2006 18:26:19 GMT, "Jim" <[email protected]>
>wrote:
>
>>Gee, here I thought that everybody knew that a 10-24 bolt has a 3/16 inch
>>shank with 24 threads per inch.
>
>Well having grown up around BSW/BSW/UNC/UNF/BA *and* Metric I for one
>knew the 24 was the tpi but I didn't have a clue and still don't as to
>what the 10 means.
>
>From what you say It's clearly not 10/64" or 10/32" or 10/16" 10/8" or
>10/4"
>
>10 gauge(swg) is about 3.2mm or just over 1/8" so its not that either
>10 gauge (awg) is 0.1019" so its not that, nor is it 10 gauge
>(shotgun) as that is 0.777 inches
>
>And some say metric is complicated?
10 is just another arbitrary number someone picked out for the
diameter. It probably starts at 0 or maybe even 00. I know model
trains use a lot of #2-56.. #4-40 is pretty common as the size in a D
shell connector retaining screw and orher small machine screws. #6-32,
8-32 and 10-32 are the most commonly used small machine screws. 10-24
is more of a "stove bolt" kind of thing with a course thread used in
places where fine tolerances are not required and where it may be
dirty when you install it.
If you had a jar of 4-40s. 6-32, 8-32, 10-32 and 10-24 it would be
about all you would need until you get up into "bolt" sizes like the
1/4"x20 and up.
"Don Dando" <[email protected]> wrote in message
news:[email protected]...
> 10-24 is a size smaller than 1/4 inch with 24 threads per inch. There are
> sizes such as 8, 6, 4. To determine the actual bolt diameter you might
> refer to a bolt size chart.
>
Gee, here I thought that everybody knew that a 10-24 bolt has a 3/16 inch
shank with 24 threads per inch.
Jim
> I just did a search on "Bolt Size Chart" and there are plenty that will
> answer your question.
>
> Don Dando
>
>
On Mon, 07 Aug 2006 00:19:47 GMT, "Don Dando"
<[email protected]> wrote:
>10-24 is a size smaller than 1/4 inch with 24 threads per inch. There are
>sizes such as 8, 6, 4. To determine the actual bolt diameter you might
>refer to a bolt size chart.
>
>I just did a search on "Bolt Size Chart" and there are plenty that will
>answer your question.
Thanks. Got a lot of info on the original post. Metric is a lot easier
<G>.