Gunsmithing Impact Action Barrel Toque Spec

[HogsLife]

Hey yal. Got my pre-fit barrel in from Altus today and was wondering what you guys recommend torquing the barrel to?

Also, do you recommend checking everything with go/no-go gauges?

Appreciate the help guys.

 

[superde]

I've changed out and swapped barrels probably 8-10 times between my 3 Impacts. IIRC they torque them to 70 ft pounds from Impact, but I torque mine to 50 Ft pounds and use anti seize (USE ANTI SEIZE!) to make them easier to break loose. All my barrels have come from Impact or Stuteville Precision (Wade makes the the Impact barrels). The tolerances are really tight on the actions, and every time I take one Dasher barrel off and put another one, the fire formed brass has the same measurements - never have to adjust shoulder bump on my dies. I've used bolts interchangeably between actions to with no issues as well FWIW. I've never used go/no gauge as well.

 

[HogsLife]

I've changed out and swapped barrels probably 8-10 times between my 3 Impacts. IIRC they torque them to 70 ft pounds from Impact, but I torque mine to 50 Ft pounds and use anti seize (USE ANTI SEIZE!) to make them easier to break loose. All my barrels have come from Impact or Stuteville Precision (Wade makes the the Impact barrels). The tolerances are really tight on the actions, and every time I take one Dasher barrel off and put another one, the fire formed brass has the same measurements - never have to adjust shoulder bump on my dies. I've used bolts interchangeably between actions to with no issues as well FWIW. I've never used go/no gauge as well.

Awesome. That’s what I wanted to hear. I appreciate the info. Looks like it’s time to get this gun together!

 

[jinxx4ever]

i touqued mine to 40 ft lbs. and am having no problems. Use anti seize. My barrels have come from Core

 

[Shanerbanner10]

Anything from 30-100 ft/lbs will do. We torque all our Impact barrels to 80 ft/lbs.

100% check your headspace. Smiths' are humans and we mess up occasionally.

 

[HogsLife]

Anything from 30-100 ft/lbs will do. We torque all our Impact barrels to 80 ft/lbs.

100% check your headspace. Smiths' are humans and we mess up occasionally.

Roger that. Got her all put together today. I ended up torquing it to 50 ft/lbs.

Looks like I need to get some go / no-go gauges. Thank you man.

 

[generalzip]

Nobody does the barrel vice and mallet technique?

 

[atombomb]

I've changed out and swapped barrels probably 8-10 times between my 3 Impacts. IIRC they torque them to 70 ft pounds from Impact, but I torque mine to 50 Ft pounds and use anti seize (USE ANTI SEIZE!) to make them easier to break loose. All my barrels have come from Impact or Stuteville Precision (Wade makes the the Impact barrels). The tolerances are really tight on the actions, and every time I take one Dasher barrel off and put another one, the fire formed brass has the same measurements - never have to adjust shoulder bump on my dies. I've used bolts interchangeably between actions to with no issues as well FWIW. I've never used go/no gauge as well.

what anti seize do you use? most of the ones I have for automotive use seem a little thick for gun use….

 

[oldrifleman]

what anti seize do you use? most of the ones I have for automotive use seem a little thick for gun use….

I use a tube of lok-tite silver that is like a thick paste and just run the tube around the threads and go with it.

 

[superde]

what anti seize do you use? most of the ones I have for automotive use seem a little thick for gun use….

Some sort of automotive anti seize. I'd have to look in my gun room to see what brand it is.

 

[Jcarpenter223]

what anti seize do you use? most of the ones I have for automotive use seem a little thick for gun use….

I had som aero shell left over from building out my ARs over the years, tossed some on the threads and torqued and sent it

 

[R_A_W]

I used to use Permatex copper antisieze (very easy to see where it is and where it isn’t), but it’s not recommended for stainless or titanium. Probably not a huge issue, but not worth the risk. Just use the nickel based versions

https://bobistheoilguy.com/forums/threads/difference-and-applicability-of-copper-vs-nickel-anti-sieze.49972/#post-625458

 

[giumau1]

is there any rule of thumb defining how much percentage of torque increase anti-seize application generates? (because we all agree on the principle grease = more resulting torque, or am I wrong?)

 

[Shanerbanner10]

You guys are over complicating the shit outta this. Torque to 30-100 lbs and add a little dab of any anti seize. It’s truly not that complicated.

 

[Mike Casselton]

is there any rule of thumb defining how much percentage of torque increase anti-seize application generates? (because we all agree on the principle grease = more resulting torque, or am I wrong?)

I don't remember the amount, but maybe @308pirate can help here.

 

[giumau1]

You guys are over complicating the shit outta this. Torque to 30-100 lbs and add a little dab of any anti seize. It’s truly not that complicated.

Of course we do and then we bitch and wine for dozen of pages about nothing. That’s the Internet. Then someone comes records it all, crunch it, and pretends it’s artificial intelligence

 

[308pirate]

is there any rule of thumb defining how much percentage of torque increase anti-seize application generates? (because we all agree on the principle grease = more resulting torque, or am I wrong?)

I don't know that there is s thumbrule but there is a formula that uses k factors (which are approximate not exact) to calculate the higher clamping force for a given torque when the threads are lubricated.

Or said another way lubricated threads create less friction which leads to the required clamping force achieved at a lower wrench torque value.

 

[oldrifleman]

I don't know that there is s thumbrule but there is a formula that uses k factors (which are approximate not exact) to calculate the higher clamping force for a given torque when the threads are lubricated.

Or said another way lubricated threads create less friction which leads to the required clamping force achieved at a lower wrench torque value.

Yeah I just put the nickel based anti size all over the barrel threads and screw the action on. I set my wrench to 80 lb/ft and go.

 

[Cynical]

72. And nothing wrong with permeates copper, or nickel, or aero shell grease if you’re an ar15 dork.

 

[NiteQwill]

I also use anti seize...

I torque my barrels to 69 ft/lbs.

Cuz, that's a number I live for in my life.

 

[TheOE800]

I also use anti seize...

I torque my barrels to 69 ft/lbs.

Cuz, that's a number I live for in my life.

Giggity

 

[308pirate]

I also use anti seize...

I torque my barrels to 69 ft/lbs.

Cuz, that's a number I live for in my life.

Oh behave, baby......