R
ron collins
Guest
Does anyone know what the reccomended torque value is for the barrel to the action when using a rear entry wrench. On a panda action
Do a search to find the old thread.
jackie schmidt
New member
Ron
If you do a quick search, you would see that this topic is discussed here about once a month.
You will also find that opinions vary. Some will say that a barrel is tight enough if you just get it close to the shoulder and give it a quick "pop". Others, like myself, believe that on a typical 1 1/16 diameter thread in 16 tpi, about 120 ft pounds, with an 18 tpi, a little less. When you think in terms of thread diameter and actuall stretch loading of the assembled parts, that is not a lot. Quite a few Rifles that would not shoot have been brought to life by the simple act of tightenning the barrel.
Remember, a threaded joint that is designed to hold two pieces together, with absolutly no movement during normal operation, has to be placed in tension. That means, in layman terms, stretching the metal. Sort of like a shrink fit in the horizonal plain. If you do not tighten a barrel and action to where there is sufficient tension between the two, the barrel will shift.
So, how much is "enough" and how much is "too much"?? Most of us have determined our own figure by simple trial and error.
I say 120 ft pounds, with a proper fitted and proper lubricated thread.
Of course, with actions that have a generous magazine cut-away, be careful with the rear wrench. Get one such as a Kelbly that induces all the torque on the front of the action and does not stress the back of the action.........jackie
If you do a quick search, you would see that this topic is discussed here about once a month.
You will also find that opinions vary. Some will say that a barrel is tight enough if you just get it close to the shoulder and give it a quick "pop". Others, like myself, believe that on a typical 1 1/16 diameter thread in 16 tpi, about 120 ft pounds, with an 18 tpi, a little less. When you think in terms of thread diameter and actuall stretch loading of the assembled parts, that is not a lot. Quite a few Rifles that would not shoot have been brought to life by the simple act of tightenning the barrel.
Remember, a threaded joint that is designed to hold two pieces together, with absolutly no movement during normal operation, has to be placed in tension. That means, in layman terms, stretching the metal. Sort of like a shrink fit in the horizonal plain. If you do not tighten a barrel and action to where there is sufficient tension between the two, the barrel will shift.
So, how much is "enough" and how much is "too much"?? Most of us have determined our own figure by simple trial and error.
I say 120 ft pounds, with a proper fitted and proper lubricated thread.
Of course, with actions that have a generous magazine cut-away, be careful with the rear wrench. Get one such as a Kelbly that induces all the torque on the front of the action and does not stress the back of the action.........jackie
Greg Walley
Member
100 ft/lbs minimum
Thanks Jackie...Well said.
We fix at least a dozen "bad rifles", "bad barrels", and "bad scopes" a year in our shop by simply tightening the barrel.
Greg Walley
Kelbly's Inc.
Thanks Jackie...Well said.
We fix at least a dozen "bad rifles", "bad barrels", and "bad scopes" a year in our shop by simply tightening the barrel.
Greg Walley
Kelbly's Inc.