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Connections made with stainless steel screws or bolts used without surface treatment generate significant friction. These are characterised by the coefficient of friction µ which can, depending on the functional characteristics of the elements of the assembly, vary from 0.20 ) to infinity (to infinity when there is seizure). The effective tensions in the corresponding assemblies then vary from 50% to 0% (zero when seizure occurs) (see Figure 1).
In order to obtain a correct and reproducible tightening of the connections, it is necessary to limit the variations of the friction coefficient µ in order to make the torque/tension relationship in the connection as constant as possible.
The values determined below for checking the torque/voltage relationship should only be assigned to industrial couplings, where the assembly conditions do not differ from the test conditions.
