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The overload test is the most severe a drilling mast or a service rig mast can be submitted to before putting into operation. In accordance with the actual standard for masts and derricks API 4F, the verification of the mast's behaviour for such a load is not always mandatory for manufacturers, but, usually, purchasers require it, in order to increase the confidence in their product and to be sure that the mast will respond appropriately to all requests during its work at the borehole. The value of this load is established by the purchaser in accordance with API 4F requirements, taking into account the real conditions in which the mast will work: borehole's deep, geological or environmental conditions, earthquakes etc. In the present paper there are analysed the results obtained using ANSYS program for a mast of 320 kN submitted to an overload which exceeds with 50% the maximum static hook load. [ABSTRACT FROM AUTHOR]