The following document aims to study the fatigue life of wnid turbine blade bearings used in the wind energy industry. The chosen methodology is based on the SN Method for fatigue analysis. A real pitch bearing specimen was used for geometry and hardness data acquisition. The material s Wohler curve was estimated from the surveyed data. Through a month-long extensiometry data measurement campaign, the stress history to which the component was subjected under real service conditions was obtained. From a Finite Element Model, it was possible to obtain the stress concentration factor in the workpiece notch, and use it to obtain the stress history at the critical point. The rainflow method was used to count the load events and the Goodman criterion was used to model the effect of mean stresses. Damage analysis was performed by the Palmgreen-Miner rule with the SN curve adapted by Haibach for long lives. The results showed that the maximum macroscopic stress at the critical point does not exceed the yield strength of the material, validating the useof the SN method. Fatigue life analysis resulted in a total damage of only D = 5.4619 · 10(−5) , which would result in a life of over 1000 years if the analyzed series were extrapolated. It was concluded that the stress history obtained from the measurement campaign is not representative of the material life, especially since it does not include emergency stop events, associated with the greatest damage. It is suggested to continue the campaign for one year, followed by correlation with wind data and SCADA data for the acquisition of a representative long-term time series.