Kudos to Mr. Boatright
- Thread starter Pete Wass
- Start date
JerrySharrett
Senile Member
Pete, you can tighten your barrels to 35 ft/lb, great. Cecil Tucker and some of the other scope doctors will love you for that.Got my new PS Magazine yesterday and over breakfast this morning I read James Boatright's excelent article on Proper Barrel Tightening Torque. A very interesting read and some great imformation for we who have been languishing in the dark.
I tried the 35 ft/lb method on 3 different Pandas and barrels that have a perfect thread profile and square shoulder.
After tightening these barrels and actions to 35 ft/lb then I made a witness mark on each. Resetting the torque wrench to just 50 ft/lb I was able to move the barrels another 0.020" radially. Now then, was/is the threaded joint firmly loaded at 35 or even 50 ft/lbs??? Not in my engineering learnings it was and is still not!!
Pete Wass
Well-known member
JerrySharrett
Senile Member
There isn't probably a "correct amount" but 35 ft/lb sure isn't enough to suit me. Vaughn's 300 ft/lb may be a bit stiff too especially for custom actions that have good straight threads and a shoulder that is perpendicular to the axis of those threads.
I use somewhere between 100 and 150 ft/lb. That's me, do what you feel comfortable with. If that's 35 ft/lb,, have at it!!
On a previous thread I posted a chart that listed torques for the different class threads. Granted, these are Class fasteners but the amounts are way above 35 ft/lb. Your 416 SS barrel has a yield of about the same as a Class 7 fastener.
http://raskcycle.com/techtip/webdoc14.html
Pete Wass
Well-known member
Something I found interesting
in his article was his stating that the chamber would stretch with more torque than 35. I have been using 100 FP for several years now. I don't know if it's right but I have a calibrated torque wrench which is limited to 100 fp. I simply want to know where I am at and I feel that 100 is not excessive nor is it too little.
in his article was his stating that the chamber would stretch with more torque than 35. I have been using 100 FP for several years now. I don't know if it's right but I have a calibrated torque wrench which is limited to 100 fp. I simply want to know where I am at and I feel that 100 is not excessive nor is it too little.