Nipples for Uberti's 1862 Pocket Police

[mykeal]

I have a slight problem with my Uberti 1862 Pocket Police. It's a small frame (like the .31 cal pocket revolvers) 5-shot cylinder in .36 cal that takes an apparently unusual nipple.

Thunder Ridge suggests that the Treso 11-50-30 should fit (.31 cal revolver nip 12 x 28), or perhaps Treso 11-50-16 (12x28 New Italian revolver). Track of the Wolf suggests their part numbers PCC-A (12-28 thread, for Colt revolvers, which was Treso's 11-50-16 when it arrived). A check with The Possible Shop found they also recommend the Treso 11-50-16 (Revolver 12x28 fits original Colt and Uberti revolvers) or perhaps 11-50-30 (Revolver 12x28 .31 cal Italian revolvers).

So I ordered a couple of each. And neither fits. Neither one will start in the hole - the threads on both are too big in diameter.

I measured the nipples that came in the gun (purchased from an auction in NIB condition - has never been shot) and they are: thread major diameter: 0.200" with 28 threads per inch.

Both of the Treso parts measured at the UNF spec for 12x28 threads: thread major diameter: 0.216" and 28 tpi (the difference between the -16 and the -30 is overall length).

The closest thread spec reference to a 0.200" major diameter is M5x0.8 (5mm = 0.19685"), but the thread pitch won't fit (0.8mm pitch = 31.75 tpi), and besides, I can't find any nipples that claim to have such a thread. The original nipples fit very well in the cylinders, so the holes are clearly made for the 0.200 MD.

Anybody have any idea what these strange nipples are? Has anyone successfully replaced the nipples on the Uberti 1862 Colt Pocket Police?

 

[JayC]

What does VTIGunparts.com offer?

 

[Bad Flynch]

Well, some of this may have to do with the age of your revolver--used or not. It is possible that an early revolver could be a metric nipple that is now uncommon. I have one of these, a recent one, and when I replaced the nipples it was a slam-dunk operation.

0.200" x 28 threads approximates, very closely, metric 5mm x 0.9 threads.

Have you measured your original nipples with a metric thread gage? You should probably try that.

Track of the Wolf has a 5.5 x 0.9mm nipple listed for 31 caliber revolvers and IIRC, that is what I used (PTC-PA is their stock code). It is a very near miss for the old Colt 0.225 x 28 nipple and might fix your problem. I used Ampco and love them.

Are you sure that the nipples will not fit? Maybe your nipple wrench is large for the cylinder recesses. Mine was and I had to file the round part down so that it would fit.

Hope that helps.

 

[mykeal]

By JayC:
What does VTIGunparts.com offer?

VTI shows a generic "Uberti nipple" that fits several guns. That nipple is the 12x28x0.501 Treso 11-50-16, which is one of the ones I tried.

By Bad Flynch:
0.200" x 28 threads approximates, very closely, metric 5mm x 0.9 threads.

Yes, it is. However, I can't find anyone listing a M5x0.9 nipple thread. M5x0.9 is not a standard ISO thread spec, either fine or coarse, which may the reason (0.8mm is the spec pitch for a 5mm MD, and that won't work). If you know of one, I'd sure be grateful.

By Bad Flynch:
Have you measured your original nipples with a metric thread gage? You should probably try that.

Yep. The original nipple fits both 28 tpi and 0.9mm pitch. At least, as far as my trifocals can tell.

By Bad Flynch:
Track of the Wolf has a 5.5 x 0.9mm nipple listed for 31 caliber revolvers and IIRC, that is what I used (PTC-PA is their stock code). It is a very near miss for the old Colt 0.225 x 28 nipple and might fix your problem. I used Ampco and love them.

I saw that listing but didn't order any because 5.5mm = 0.2165", or almost exactly the SAE #12 MD dimension that doesn't fit. It's possible, but I'd be surprised if they were 0.016 undersized. I may order some anyway, since they worked for you. Can't hurt to try, as I'm out of any other ideas.

This whole exercise started because I'm slowly converting all my guns to AMPCO nipples, hence the emphasis on Treso in the first go-around.

By Bad Flynch:
Are you sure that the nipples will not fit? Maybe your nipple wrench is large for the cylinder recesses. Mine was and I had to file the round part down so that it would fit.

Yeah, I fussed around for quite a while with a couple of different wrenches trying to get the old nipples out. I did finally get one to fit, and it will reinstall the old nipples with no problem. The new 12x28 nipple threads are just too large to fit into the holewith either a wrench or my fingers.

Thanks for your input. I'm gonna give TOTW a call tomorrow and see if that PTC-PA will help.

 

[Jim K]

Dixie lists the M5.5x0.9 nipples for Uberti guns as their part number NP2040, price $2.50 each.

Their website is www.dixiegunworks.com

Jim

 

[mykeal]

Yes, thanks, Jim

By Jim Keenan:
Dixie lists the M5.5x0.9 nipples for Uberti guns as their part number NP2040, price $2.50 each.

Yes, I did see that. It's steel, not the AMPCO, I'm trying to convert to, but thanks anyway. If TOTW doesn't have the AMPCO version I may order the DGW one just to see if 5.5mm fits.

 

[Bad Flynch]

Well, we got lucky. I found the package tag that I took off the Treso nipples when I converted my 1862 Uberti Colt Police. It is 5.5 x 0.9mm and the Treso number from the tag is 11-50-30. I think that I bought them from TOW.

 

[mykeal]

Ouch!

By Bad Flynch:
Well, we got lucky. I found the package tag that I took off the Treso nipples when I converted my 1862 Uberti Colt Police. It is 5.5 x 0.9mm and the Treso number from the tag is 11-50-30. I think that I bought them from TOW.

I just pushed the button on an order for 2 of the PTC-PA from TOTW.

Both Thunder Ridge and The Possible Shop say Treso 11-50-30 is 12x28, which is understandable; M5.5x0.9 is so close to that as to be indistinguishable with hand gages.

The problem is that Treso 11-50-30 is one of the ones I tried that doesn't fit, so it looks like I've ordered some more of something I already know doesn't work. I was kind of hoping that the PTC-PA version was a different manufacturer that was slightly undersize. Oh, well. The good news is they fit other guns as well, so I'm not really out anything. Besides, they're on back order.