Jam nuts on top of rear shocks

[Exp21]

Hi everyone. I'm trying to find the proper way to install and torque to specs the two top nuts (jam nuts) of the new set of rear shocks for my B-class. Aftermarket shocks have two nuts instead of the MB original one. WIS says to torque to only 20 Nm. First question: is it possible only 20 Nm?
Second question: 20 Nm is referred to a single nut. But in the case of jam nuts, I read that the first nut has to be torqued to about 50% of the value, and then the second nut torqued to the full value (20 Nm) while holding the first nut. Is it the proper way?

Do you have knowledge about jam nuts? Thank you

 

[LostKiwi]

I'd bin the jam nuts and use nylocs.

I also wouldn't worry too much about torque figures as long as they're tight enough not to come undone and to hold the shock properly in its mounting.
To tighten jam nuts just hold the lower one and tighten the second one tight against it firmly.

 

[rifiki]

Have changed plenty of shocks, here and overseas. As with LostKiwi never bothered.

 

[EmilysDad]

That's the first time I've ever heard of lock nuts being described as 'jam nuts' ....

 

[Exp21]

Thank you when I read wis my first thought was if torque is so low, there must be the risk of damaging the rubber bushing. But probably it's overthinking.
I'll search for a nyloc one

 

[EmilysDad]

Thank you when I read wis my first thought was if torque is so low, there must be the risk of damaging the rubber bushing. But probably it's overthinking.
I'll search for a nyloc one

A local engineering supplies will have loads of them .... my R Class use two M8 nylocs at the top of each shocker.

 

[Exp21]

Thank you

 

[Tony Dyson]

"Jam Nut" Sounds like another American trying to reinvent the English language again

 

[Exp21]

I know it's the famous question . The bolts of the front shocks have to be torqued 120 Nm + 90 deg. Wis says to replace them.

I think there's a difference between TTY (torque to yield) bolts and torque+angle bolts. Probably these are TA.

Honestly in 10 years it's probable that some mechanics went heavy with impacts when doing alignments on those nuts. It could be dangerous to reuse them?
But if I spend 30-40 euros in new bolts, then I take the car for alignment, they loose and impact them again and we are full stop and newline. A complete no-sense.

Thanks again