Loctite and torque specifications

[Tony Rama]

A general engineering question.

Does the use of loctite affect the torque specifications for tightening fixings?

ie if the spec. is for example 90nm and I use loctite, am I going to end up over torqueing the bolt?

[passenger]

Well I'm using daily locktite 253 I think, blue one, on job building cheese machines.

No, it will not be overtighten. Just that first "braeking" will be more difficult and screw you cannot put out with fingers when you loose it with wrench, because extra material on threads.

If you are not sure, you can put a lil bit blue one. Dont worry, you will undo screw with a lil bit extra force, it will not be "locked for ever"

[Tony Rama]

Thanks. I've used it many times, and know it takes a little extra force to break the seal when loosening, but it occurred to me that the slight lubricating effect of using it might cause over tightening.

[passenger]

Dont worry. I even use it on furmiture where possible is.
on car just where I dont have specific torque number.

[ferg55]

According to this user guide, no "on-torque" adjustment is necessary:

https://www.ellsworth.com/globalasse...eadlocking.pdf

[Tony Rama]

Thanks everyone for the responses.

I read somewhere that nearly all the torque friction is on the bolt head/nut interface and not the threads. So it seems one should keep the clamping area, and any washers, grease free and dry, and everything will be OK.