OzFclass

Howd'y all,

Who out there uses a Torque Wrench to set the barrel into the receiver?
And what torque setting do you use?
Thanks.

I do. I run 80 ft/lb & still need a bar on my socket handle to take it back off.

80 ft lb for me also.

I use an Extreme Pressure Assembly Lube (grease) on the barrel threads and tighten to 40 ft/lbs. As John noted above it takes a breaker bar and socket to loosen off again and thats with half the tightening force that John and Alan use! I also use the same grease on my bolt lug faces.

The grease I use is a CRC product, Part No. SL3333 and it is also an anti-seize so hopefully I will always be able to change my barrels without problems. http://crcindustries.com/auto/?s=SL3333

Ian

Used 80 ft lb on barrels changed frequently and 120 ft lb on permanent setups. Used a grease on threads only.

David

I use 40 ft/lb and grease
easy to undo but defiantly won't come off by its self

2 grunt on a short bar for my barrels
RB

80 ft lbs and Loctite 771

I am with Richard

I think consistency is important more than a certain torque setting.

If you go by what a lot of people use somewhere between 60-85ft/lbs is the norm.

If you use the scientific route and calculate it based on threads and pressures you should be MUCH higher.

I think of it this way, your torquing up to a shoulder, not torquing mating surfaces with a through bolt, any excessive torque is just unduly stressing the threads.

Rifles are quite unique in the manner they hold pressure.

The amount of threads I have had to repair in my time as a fitter/machinist due to morons over tightening is quite incredible, particularly ones that are cycled on a regular basis!!

A case of common sense maybe?

I think of it this way, your torquing up to a shoulder, not torquing mating surfaces with a through bolt, any excessive torque is just unduly stressing the threads

Yes that’s my point exactly Jason if the treads and shoulder are true over tightening achieves nothing only additional stress on the threads
I do use the barrel Sinclair’s white thread grease this works well for me.
I have no idea how much torque I’m applying not that much I would expect may get a wrench and measure it one day
RB