Hi, this post is to provide some dimension information for the archive on Pietta and Uberti cylinders. One C&B cylinder from a recent purchase Pietta and Uberti 1858 8" revolvers were removed and measurements taken.
Date code:
Pietta CI
Uberti CN
Cylinder length:
Pietta 2.017"
Uberti 2.000"
Cylinder diameter:
Pietta 1.593"
Uberti 1.601"
Cylinder pin hole:
Pietta 0.276"
Uberti 0.276"
Cylinder chamber diameter:
Pietta 0.446"
Uberti 0.449"
Cylinder bolt width:
Pietta 0.156"
Uberti 0.160"
Opposite chamber face to face ID:
Pietta 0.548"
Uberti 0.549"
Opposite chamber face to face OD:
Pietta 1.440"
Uberti 1.449"
There have been questions on whether the lower cost Pietta cylinders could be adapted to the Uberti revolver. Use this information as you will.
Regards,
Richard
Hi, I received my Uberti 1858 6-shot conversion cylinder today. It fits perfectly in my Uberti 1858, a drop in. While it was sold by Midwayusa as a Howell, the box says Taylor. I measured the dimensions of both the Taylor Pietta 6-shot 1858 and Uberti 1858 conversion cylinders and will list those dimensions with the C&B cylinders:
Cylinder length:
Pietta C&B 2.017"
Uberti C&B 2.000"
Pietta conversion cylinder 2.014"
Uberti conversion cylinder 2.000"
Cylinder diameter:
Pietta C&B 1.593"
Uberti C&B 1.601"
Pietta conversion cylinder 1.624"
Uberti conversion cylinder 1.624"
Cylinder pin hole:
Pietta C&B 0.276"
Uberti C&B 0.276"
Pietta conversion cylinder 0.2785"
Uberti conversion cylinder 0.278"
Cylinder chamber diameter:
Pietta C&B 0.446"
Uberti C&B 0.449"
Pietta conversion cylinder 0.4525"
Uberti conversion cylinder 0.453"
Cylinder bolt width:
Pietta C&B 0.156"
Uberti C&B 0.160"
Pietta conversion cylinder 0.160"
Uberti conversion cylinder 0.158"
Opposite chamber face to face ID:
Pietta C&B 0.548"
Uberti C&B 0.549"
Pietta conversion cylinder 0.546"
Uberti conversion cylinder 0.541"
Opposite chamber face to face OD:
Pietta C&B 1.440"
Uberti C&B 1.449"
Pietta conversion cylinder 1.451"
Uberti conversion cylinder 1.448"
Notice that other than conversion cylinder length on how close the conversion cylinder dimensions. IMO the forcing cone would make up for the slight difference. Since I had two Taylor Pietta conversions, I thought of just turning down the face of one of the Pietta cylinders to fit the Uberti 1858 and send the new Uberti conversion cylinder back. One can never have too many conversion cylinders so I will keep the Taylor Uberti conversion cylinder.

However, if any of you have a Uberti, you can probably modify a Pietta 1858 conversion cylinder safely to work in your Uberti 1858.
One note on these conversion cylinders for the 1858 is that the timing is set to drop the bolt before the bolt slot lines up. Further cocking allows the bolt to fully enter the cylinder bolt slot.
This information may not be useful to you today, but hopefully provide a useful archive reference for the future.
Regards,
Richard