This paper investigated the Thrust force and surface roughness in drilling of AI/15%SiC/2%Gr and AI/15%SiC/4%Gr hybrid metal composites fabricated by stir casting method. The experiments were conducted with Tin coated solid carbide twist drill of 4 mm diameter under the dry cutting condition. The result revelled that inclusion of graphite as on additional reinforcement in Al/SiC reinforced composites reduce the thrust force. The cutting speed and its interactions with feed rates are minimum. The feed rate has a major influence on thrust force and surface roughness in both hybrid composites. The less thrust force value and higher surface roughness value for AI/15%SiC/4%Gr hybrid metal composite compared to the AI/15%SiC/2%Gr composite. The thrust forces and surface roughness values are increases with increase in feed rate and decrease with increase in cutting speed in both hybrid metal matrix composites.