Dear Husqvarna

[Lightmart]

Loctite can be a good solution, but, only if it was originally specified in the joint. Loctite really screws (no pun intended) with the relationship between torque on the fastener and preload, and you can end up with a bolt which has had the right torque applied, but hasn't reached the right preload. If I were specifiying a joint to use Loctite, I would have to test the torque / preload relationship first to gain confidence.

 

Any locking device which changes the friction relationship can be useful, but, the torquing procedure will be defined during design or development to account for it. Fitting such a fastener in place of a standard one, and then using the torque spec for the standard fastener is dodgy to say the least.

 

Wire locking prevents the fastener unwinding - but, embedding failures and gasket settling can [and do!] give rise to joint failure without the fastener head rotating at all! Preventing fastener rotation prevents many, but not all joint failures.

 

In mentioning embedding and gasket failures, I'm talking about joint relaxation which is of the order of a few tens of microns leading to near complete loss of tension in the bolt.

 

Just to add fuel to the fire!!