BB'L Torque Specs

[jpretle]

What torque is recommended for Rem and Savage bbl's, when using OEM?

 

[riflewoman]

60 to 80 foot pounds would be where I start.

 

[butchlambert]

60 to 80 foot pounds would be where I start.

I think you know what you are talking about.

 

[dantiff2]

My barrel wrench says 30-40 Lb-Ft. I snug to 40 with a torque wrench in place and have not had one come loose yet

 

[X Ring Accuracy]

We used to torque chebby head bolts at 68 ft lbs. Some people use 1/8 turn past contact for barrel torque. One question...... do switch barrels have the same torque. No they don't so to torque a barrel to 80 ft lbs is massive overkill. Just my opinion, flame suit on, naturally

 

[boltfluter]

I have had great results with 75 ft.lbs. Not really sure how critical it is but I have had great luck at 75.

Regards, Paul

www.boltfluting.com

 

[Canadian bushman]

Ive been thinking about this more and more with each barrel i put on.

I would like to do an experiment where the barrel was put on hand tight and a tick mark scribed to indicate its position. Then go shoot. With right twist barrel it should only get tighter.

Once it settles, snap the barrel loose and see what force it took to unscrew. 10 ft/lbs over this would be my new min.

 

[billlarson]

The problem with specific torque specs. are......
class fit of threads
true lead of thread
thread finish
square of receiver to barrel shoulder

 

[X Ring Accuracy]

Correct Bill. If all surfaces are square when they lock up, over torqueing then starts pulling the threads.

 

[jr600yd]

Correct Bill. If all surfaces are square when they lock up, over torqueing then starts pulling the threads.

I have a Gilkes Ross action.. Guess you could call it a switch barrel? I was told 35 - 50lbs was all that was required. Never had a problem.

 

[M-61]

The problem with specific torque specs. are......
class fit of threads
true lead of thread
thread finish
square of receiver to barrel shoulder

AND the most overlooked.....lubricant on the threads which drastically changes a torque value if indeed you can find one for the given project.
If you found a torque value (meaning an official number from a manufacturer) it most likely never states the torque reduction with a particular lube, in other words is the number given with or without lube and if 'with lube' what type.
With Savages I have found 40lbs.ft. (using anti-seize) on the jam nut to be sufficient. I switch barrels frequently and have not encountered any problems. (Such as a 'loose' jam nut.)

 

[jpretle]

Correct Bill. If all surfaces are square when they lock up, over torqueing then starts pulling the threads.

Given the above (square surfaces and all), at what torque do you start 'pulling the threads'????

 

[Geno C]

Given the above (square surfaces and all), at what torque do you start 'pulling the threads'????

In theory, as soon as solid contact with the mating surfaces is made; barrel shoulder to lug to action face. One the metal meets the metal solidly, what do you think will move first? The little triable of thread or the solid shoulder of barrel?

I've tested a 300wsm on a model 70 pushfees action and hand tight held just fine over 200 rounds of 210 bergers being pushed down a 10 twist at 2900ish fps. No thread lube used. If anything it might have actually come off a little harder. I know guys that do it all sorts of ways and I haven't seen a difference.

 

[JRS]

Hand tight then snug it up.

 

[Rustystud]

A Gilkes Ross is a special action with a spigot fit tennon. Threads are intentionally loose fit. The threads pull the action together, it they are to tight they will gall.
Nat Lambeth

 

[jr600yd]

Nat I'll take your word on that. It sure is easy to change barrels and I've never had a problem.

 

[spclark]

I have a Gilkes Ross action.. Guess you could call it a switch barrel? I was told 35 - 50lbs was all that was required. Never had a problem.

I have one too, only action I ever had a barrel work loose on. At the time I was using it in a Ross stock where the action floats off the barrel, secured by a barrel clamp up forward. Working the bolt unscrewed the action....

Now - having acquired a torque wrench several years ago, after that incident - I've settled on 60 ft lbs for the actions I'm using: G-R, RPA Quadlite, CG INCH. Anti-seize used with all.