
Barrel Thread Size
#1
Posted 05 October 2005 - 08:02 PM
Kj
#2
Posted 05 October 2005 - 09:53 PM
Dan
#3
Posted 06 October 2005 - 09:24 AM
BB
#4
Posted 06 October 2005 - 04:00 PM
QUOTE (PhilOhio @ Oct 6 2005, 11:24 AM) |
Aren't those called "Acme" threads? |
You are correct sir.
#5
Posted 06 October 2005 - 04:20 PM
Thanks to everyone who replied. KJ
#6
Posted 07 October 2005 - 08:49 AM
The thompson is a Square thread and I believe the pitch is 10 per inch. I can't remember the diameter though 7/8" comes to mind.
Acme threads don't have a 45 deg flank but they do have some taper where the square threads have very little.
Frank
#7
Posted 07 October 2005 - 10:01 AM
Yes, Thompson thread form is what we call square, the major diameter is .848 and 10 pitch is correct.
Acme threads are 29 degrees.
#8
Posted 06 June 2019 - 02:35 PM
I would like to chase the barrel treads of a 1928 receiver, I have my NOS barrel does not want to go in and I don't want to force it.
Does anyone know a source for the bottoming tap this would require? Looks like 7/8-10?
Thanks
Bill
#9
Posted 06 June 2019 - 04:53 PM
It may help to clarify the problem who made the receiver and who made the barrel?
Ron
#10
Posted 06 June 2019 - 05:10 PM
#11
Posted 06 June 2019 - 07:07 PM
Thanks, I did not think of that. These are both mill spec pieces, the barrel is new but the old reciever got a bit torn up and galled removing the old barrel. Appreciate the help.
Bill
#12
Posted 06 June 2019 - 07:40 PM
I have found several "NOS" barrels that are slightly oversized. They needed to be just skimmed a bit and they fit fine.