Need nipple size

[Doc O]

I've just ran across a 1973 Uberti Griswold Gunnison .36 cal. in very good shape.
It has been fire but could not have been much.
It took me an hour to get the old nipples out.   I think they were never taken out, ever.
Anyway would anyone have the nipple size for this older gun?
New uberti nipples are to small. I tried them.
I can still shoot it with these nipples but I would like to replace with Tresso's.

Thanks
Doc

[Flint]

Current Ubertis use the #12-28 nipple thread which they changed to when they made cylinders for the Colt 2nd gen guns.  Previous to that I believe Uberti used M6x0.75 nipples which are the same as the current Piettas use, so try that size.

A #12 thread would be too small, as you found, in a 6mm hole.  #12 is .216/5.5mm dia., 6mm is .236 inch.

In metric, a #12-28 would be M5.5x0.90, if that was important enough to know.

The original Colt cap & ball nipple was a .225-32 thread, which Colt did not use for the 2nd and 3rd gen guns, perhaps to discourage fakes, as well as reversing the rifling direction.

[Doc O]

Thanks Flint.
I'll give the Pietta nipple a try.
You brought a good point about the original colt size. I checked a nipple with a pitch gauge
and it was 32.
The .225. What is that measurement. Or should I say where do I make that measurement of .225.
Thanks again
Doc

[Doc O]

The Pietta nipple seem to fit. But
Did some measuring and found.
Nipple       OAL                   Length from base [top of threads] to top of cone
Pietta------.5405---------------------------------------.322
Griswold---.499-----------------------------------------.290
Treso-------.521----------------------------------------.331
So this would means I would have to trim the cone on the Tresos by .041 to get the same length as the Griswold nipple.

Do you think that would make the cone on the Treso to short for the cap to fit properly? They are a bit high priced to mess up.

Doc

[Montana Slim]

Thanks Flint.
I'll give the Pietta nipple a try.
You brought a good point about the original colt size. I checked a nipple with a pitch gauge
and it was 32.
The .225. What is that measurement. Or should I say where do I make that measurement of .225.
Thanks again
Doc

Doc,
The first number of a thread size is the major diameter (biggest diameter) - you can measure with a caliper or mic.
The second number is the pitch. or # of threads per inch (or cm for metric). - use a thread pitch gauge for this.

Regards,
Slim

[Sir Charles deMouton-Black]

I recently acquired a repro 1861 Navy.  It was registered as an Uberti, but I wondered why it didn't take the same nipples as my 1851 which was clearly marked as an Uberti.

The 1861 does not seem to have any makers ID on it.  The only marks are the proof stamps, serial number (4 digits following "N"), Year stamp XXIV, and on top of the barrel; "NEW NAVY MOD. 1861 CAL. 36".  Looking closely at the model year, it seems an 1851 stamp was used and the "6" is stamped over the "5"?

The year of manufacture is 1968, which likely explains the nipple thread issue.  I have a link to Adler's article on Italian markings so I know what to look for, but no makers mark?  I live in Canada, but always thought that a makers mark was required.

I know this is a bit of a hijack, but does anyone have any more info on this revolver?

[Doc O]

Doc,
The first number of a thread size is the major diameter (biggest diameter) - you can measure with a caliper or mic.
The second number is the pitch. or # of threads per inch (or cm for metric). - use a thread pitch gauge for this.

Regards,
Slim

Thanks Slim.
That is what I was thinking but wanted to conferm.
Again do you think the Treso nipples could be trimed .041 and still work OK?
I still need to do a bit more measuring.

Sir Charles. No problem, hope you can find something out about the revolver.

Doc

[Montana Slim]

Thanks Slim.
That is what I was thinking but wanted to conferm.
Again do you think the Treso nipples could be trimed .041 and still work OK?
I still need to do a bit more measuring.

Sir Charles. No problem, hope you can find something out about the revolver.

Doc

I'll say "probably"...that assumes that the TRESO nipples are STRAIGHT sided (not cone-shaped, as I'm told).

Slim

[Doc O]

Slim; I know you don't use Treso's but I beleave they are on that Spiller and Burr.
Would you take a look if you have time and see what you think.
Doable?

Doc

[Doc O]

I think I found some that will fit.
Just have to waite for them to come in stock.

Doc

[Montana Slim]

Slim; I know you don't use Treso's but I beleave they are on that Spiller and Burr.
Would you take a look if you have time and see what you think.
Doable?

Doc

I'm sure the Treso's can be shortened on OAL.
A poor-mans lathe, a file & emory paper should suffice...measure, polish, test & repeat until successful.
When you get one set to the correct length, use it as a guide to shorten the rest.

I'll have your pistola at the next match.

Regards,
Slim

[Doc O]

Thanks Slim.
I should be there unless something comes up I don't know about.
Might have to break out the 61's. They haven't been out for a while.

Doc

[Doc O]

Slim.
Sent you a PM

Doc

[Doc O]

Found some.
Got them from Don at The Possible Shop.
He went the extra mile to take some measurements over the
phone and they fit perfect.

Doc