#10 screw and 3/16 screw

[john hobdeclipe]

Just to add a bit of interest to our lives...the tapped holes in those aluminum 19" server/relay/telecom racks full of high tech equipment are usually#12-24.

[psomero]

So two standards ?
Send the lad out to the hardware shop for a standard 1/2" bolt, what will he come back with ?

Outside of the US no one uses UNF / UNC any more. At one time the Auto industry in the UK used these as a lot of companies were American based but with recent sell off's Japan and Europe have taken over as owners and they use metric.



Send the lad out for a M12 bolt and he'll come back with a M12 x 1.75 bolt.

.

If he wants any other pitch he'll have to ask for it.

when you go to the hardware store, anybody worth a damn will know to ask you "coarse or fine thread pitch?" when you ask for that 1/2" bolt...

[John Stevenson]

the standard NC thread is 1/2-13 The standard NF thread is 1/2-20

So two standards ?
Send the lad out to the hardware shop for a standard 1/2" bolt, what will he come back with ?

Outside of the US no one uses UNF / UNC any more. At one time the Auto industry in the UK used these as a lot of companies were American based but with recent sell off's Japan and Europe have taken over as owners and they use metric.

It's the holy standard METRIC, which claims to be so standard, but turns out to be just as messed up as any other system in reality.

Send the lad out for a M12 bolt and he'll come back with a M12 x 1.75 bolt.

.

If he wants any other pitch he'll have to ask for it.

[J Tiers]

Ok take the imperial equivalent of 12mm as being 1/2"

In 1/2" and I have just checked my tap list you have 12 tpi, 13, 16, 18, 20, 24, 26, 30, 32 and 40

Now ask for a 12mm bolt and 90 % of the time you will be given a 1.75 pitch bolt, the other being specials.

Out of the 10 threads I have listed for the 1/2" which one is standard ?

.

the standard NC thread is 1/2-13 The standard NF thread is 1/2-20

All the rest are specials for particular purposes, although one may be an "NEF" or national extra fine" .... i.e. basically a special.

You can MAKE a 2"-36 thread....... doesn't make it a hardware store standard.. it isn;t the US threads in question,.... we know they have oddities from the last 150 years + of industrial activity.

It's the holy standard METRIC, which claims to be so standard, but turns out to be just as messed up as any other system in reality.

[Forrest Addy]

Metric is for weenies.

Real men use the Imperial system of weights and measures, hunt bear with a switch, and floss their teeth with barbed wire.

[JCHannum]

I have thread charts for number screws, they were called ASME, up to #30. They were 14 & 16 TPI, Letter V and 25/64 tap drills respectively.

I have an acumulation of special thread taps and dies I have accumulated over the years, they do come in handy from time to time. I usedd the 5/16"-64 tap & die a while back to make an insert for a thin section where a standard thread would not have worked.

[oldtiffie]

Flat out

John,
Here in the Simple US, it's always the specials...

The biggest problem I run into here, is a lot of the US Metric Bolt heads are 1 mm bigger than EU metric bolts...

Fun In tight spaces.. EU is used to that, I'm sure

61.1 Million Brits ought to be able to tell Us 300 million plus, to get it right

From a non-Brit but metricated country (OZ):

[John Stevenson]

John,
Here in the Simple US, it's always the specials...


61.1 Million Brits ought to be able to tell Us 300 million plus, to get it right

Now add all of Europe to the 61.1 million, then Asia, then Australia, then most of South America.

No not stirring or looking for a fight but all too often I see posts like the 1/4 x 26 and the never ending one about the Chiwanese mill / drill with the *special* 1/2" x 12 threads in the base casting when in fact they are not special but a standard, OK not UNC or UNF but those two thread standards don't cover the globe, in fact out of the USA they are obsolete.

Any decent screw thread book will list these, they are even in machinery handbook believe it or not.

.

[websterz]

John,
Here in the Simple US, it's always the specials...

The biggest problem I run into here, is a lot of the US Metric Bolt heads are 1 mm bigger than EU metric bolts...

Fun In tight spaces.. EU is used to that, I'm sure

61.1 Million Brits ought to be able to tell Us 300 million plus, to get it right

They're still pissed that they got beat by a bunch of colonial hicks.

Nuttin' but love guys...just joking!

[Bguns]

John,
Here in the Simple US, it's always the specials...

The biggest problem I run into here, is a lot of the US Metric Bolt heads are 1 mm bigger than EU metric bolts...

Fun In tight spaces.. EU is used to that, I'm sure

61.1 Million Brits ought to be able to tell Us 300 million plus, to get it right

[John Stevenson]

And then I ran across a 1/4-26 the other day. Not an ancient screw...it was a forend screw for a British BSA International Mk II Martini rifle, which started production in about 1955. None of my "special" series tap charts even mentioned that size..

David

1/4" x 26 is a standard BSF size just as you have UNC and UNF we have BSW and BSF.

Seeing as it was for a 1955 British rifle it would fall into the right size and era.

You need new tap charts that show countries other than the USA.

Neil Armstrong WAS NOT the first American to go abroad.

.

[John Stevenson]

yep, the system with 5 different possible pitches for an M12 screw........

Ok take the imperial equivalent of 12mm as being 1/2"

In 1/2" and I have just checked my tap list you have 12 tpi, 13, 16, 18, 20, 24, 26, 30, 32 and 40

Now ask for a 12mm bolt and 90 % of the time you will be given a 1.75 pitch bolt, the other being specials.

Out of the 10 threads I have listed for the 1/2" which one is standard ?

.

[oldtiffie]

Set it to music!!!

Originally Posted by mardtrp
Oh the joys of playing with that outdated MONGREL system , it's about time you lot converted to the easiest system of them all, metric.


Mark

yep, the system with 5 different possible pitches for an M12 (or is it M14) screw........

And the "standard" pitches differing depending on which country the screw is from.....

And the 4 selectable gears on the thread dial...... with the little book to tell you which to use, unless its one of the oddballs

Yah, metric isn't standardized, it's just standard....... And just as standardly effed up as "imperial".

Besides, teh 3/16 size is ancient, non-standard, and incompatible with modern ones....... It dates from before the time 130 years ago when the US officially converted to Metric.

I DO have taps and dies for 3/16, and for #12, and some other oddities

And for "standard" metric as well. European metric, not Asian.

Here JT.

Stop your moaning.

Be happy.

Set it to music.

Lots of tempo and even the meter/metre has fractions:

http://en.wikipedia.org/wiki/Meter_(music)

Now watch the pretty arm on the metronome .................

http://en.wikipedia.org/wiki/Metronome

......... and you will feel sl-e--e---p----y and r-e--l---a----x and fall to s-l--ee ..........................

z-z-z-z-z
-z
-z
-z.

So have a few "zeds".

Its a lot more peaceful than you banging that "metric" drum!!!

[38_Cal]

And then I ran across a 1/4-26 the other day. Not an ancient screw...it was a forend screw for a British BSA International Mk II Martini rifle, which started production in about 1955. None of my "special" series tap charts even mentioned that size... I was fitting a new barrel to this rifle, so I just made a new screw to match the dimensions of the original, except for it being 28 tpi. Easier for me, and cheaper for my customer, than trying to come up with the "proper" tap!

David

[J Tiers]

Oh the joys of playing with that outdated MONGREL system , it's about time you lot converted to the easiest system of them all, metric.


Mark

yep, the system with 5 different possible pitches for an M12 (or is it M14) screw........

And the "standard" pitches differing depending on which country the screw is from.....

And the 4 selectable gears on the thread dial...... with the little book to tell you which to use, unless its one of the oddballs

Yah, metric isn't standardized, it's just standard....... And just as standardly effed up as "imperial".

Besides, teh 3/16 size is ancient, non-standard, and incompatible with modern ones....... It dates from before the time 130 years ago when the US officially converted to Metric.

I DO have taps and dies for 3/16, and for #12, and some other oddities

And for "standard" metric as well. European metric, not Asian.