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[Andy B]

.....

edit .. must either type less or type faster !!!

        

[psl]

I did think that might be what was ment but couldnt understand why a higher torque value wasnt just specified.

[Entwood]

I did think that might be what was ment but couldnt understand why a higher torque value wasnt just specified.

Torque values are highly dpendant on the condition of the threads and the surface the nut is rotating against .. if lubricated you will get a lot more tension in the bolt than if they are dry and corroded.

The "turning force" of the handle will be the same.. but one will both strech the bolt and overcome friction, the other just causes "stretch". By using a releatively "light" torque setting then an angle tighten the "stretch" or "clamping force" of the nut & bolt is far more accurately set.

If a bolt is tightened to "just" within its elastic range it will hold far better. Bolts that have high forces (head bolts) or are in critical positions (brakes, steering, suspension) use angle tightening for this reason.

HTH

[psl]

you lern somthing new every day