The following safety factors SG against slipping for the screw calculation according to VDI 2230 shall be taken into account:· Safety factor against slipping for fatigue load: SG,fatigue=1.8· Safety factor against slipping for static load: SG,static=1.2"Within the clamping area of a screw/bolt connection it shall be ensured by the supplier that no coating is applied. If primer is necessary due to the usage of carbon-steel then this needs to be limited to a thickness of maximum 0.06mm and shall be only present on one side of two contacting surfaces.If any additional coating is used (e.g. powder-coating) the supplier is obliged to provide the amounts of embedding and friction values to Bombardier.