MP-40 barrel nut torque
Posted 29 December 2017 - 09:15 PM
Posted 30 December 2017 - 06:54 AM
So, if you have a safe way of anchoring the receiver, tighten the nut snuggly and see if it loosens up. If it does, clean the threads of the nut and the receiver and use a drop or two of loctite and snug it up again to where it was before. Hope this helps.
Posted 30 December 2017 - 10:52 PM
Posted 06 July 2019 - 02:02 PM
Loosening is a current problem that I have with mine. I may have to use the lock tight on it to keep it on. I thought that I had it pretty tight. But, yesterday while shooting. The nut became finger loose.
Any other ideas?
Posted 08 July 2019 - 05:25 PM
Does the lock tight method make it difficult to remove the nut in the future?
Posted 09 July 2019 - 04:11 PM
Does that include heat from firing the gun as well? Just curious about how many rounds it would take to melt the lock tight.
Posted 12 July 2019 - 08:58 AM
Here's a pic of the factory installed staked locking ring on my '41 bnz MP-40. The barrel nut has never been removed. Have no idea what torque value was originally used, but it shows no sign of loosening on its own after 78 years. The sling ring wiggles slightly.
Edited by TSMGguy, 12 July 2019 - 09:00 AM.
Posted 14 July 2019 - 06:17 AM
Thank you TSMGguy. I have tightened the nut as best as I can, but it likes to get loose. I bought a NOS ring and will try that. Now, I may have to go look, buy my sling ring may be facing the wrong way! If that's the case. It came that way when I bought it 10 years ago!!
Posted 20 July 2019 - 05:48 PM
I suspect the stakes in the locking ring prevent self loosening of the nut.
Right, the sling loop was factory installed on the right side where the sling doesn't foul the operating handle or get in the way of switching magazines. I'm a leftie, so the sling is always in my face!