How the heck did my Savage barrel nut come loose?

[Arizona_Mike]

Torqued it to 30 lb-ft indicated. Virgin range trip and I'm glad I checked if the suppressor was snug before shooting!!! Long car trip to range, did it vibrate??? Had to loosen the barrel a bit to get the bolt back in so I suspect it turned in the car.

I used some Mobile 1 synthetic grease on the threads just like I do with all the ARs I've built. Should it be dry?

Strange . . .

Mike

 

[jerkface11]

I've had one come loose before too. Torqued it back down and it wasn't a problem again.

 

[Carolina Kalash]

Only thing i could figure is if your rifle fires powerful round then the recoil could've jarred it loose

 

[Kp321]

I have not seen the 30 ft-lb quoted. I guarantee the factory setting is more than that! I use at least 100. You are correct to lube the threads before torquing. I personally use Fel-Pro brand anti seize but any lube is better than dry threads.

 

[jerkface11]

There's no torque spec at the factory. They tighten the nut till the headspace is correct.

 

[Arizona_Mike]

As far as recoil it has never been fired.

My barrel nut wrench insturctions say 30-40.

Mike

 

[Arizona_Mike]

I just put a digital hanging scale on the wrench 17 inches from the axis and got between 16 and 17lb when it tripper at 30 lb-ft indicated. That's between 23 and 24 lb-ft actual torque.

Mike

 

[moojpg2]

On an AR, Its supposed to be torqued to 30ft lbs and then further tightened until the gas tube alignment is correct. Maximum torque for mil spec is 80 ft lbs.

I would say didnt make it tight enough. I would tighten it to 30, then back it off and re torque it to slightly above 30

 

[Arizona_Mike]

On an AR, Its supposed to be torqued to 30ft lbs and then further tightened until the gas tube alignment is correct. Maximum torque for mil spec is 80 ft lbs.

I would say didnt make it tight enough. I would tighten it to 30, then back it off and re torque it to slightly above 30

On an AR, I torque several times to 30, and then to 35 and then the next position. If I go over 50 I'll try another nut.

However this has nothing at all to do with Savages.

I posted the root cause on the 12th. My torque wrench was way off calibration.

Mike