Wrench, angular clamping disc with a 1/2 '' square for torque wrench.
It consists in saying that if we turn the nut by one turn (360 °), it amounts to taking a step on the screw. If we know the pitch of the screw (in mm) then we know how much the screw extends. Original OEM comparison numbers are for identification purposes only, they are not original OEM tools.
So if you do a 90 ° angular tightening , you know that the screw extends by a quarter of the screw pitch. If the pitch of the screw is 1 mm, then you know that the screw has lengthened by 0.25 mm.