A surgical device, comprising: a powered actuator device including at least first and second rotatable drive shafts; a surgical end effector (40, 50, 60, 70) including at least first and second axially translatable drive members; and an adapter assembly selectively interconnecting the surgical end effector (40, 50, 60, 70) and the powered actuator device, the adapter assembly comprising: a first drive converter assembly configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the first drive member of the surgical end effector; and a second drive converter assembly configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the second drive member of the surgical end effector, the first drive converter assembly being at least partially disposed within the second drive converter assembly, wherein the first drive converter assembly and the second drive converter assembly are configured to rotate and translate independent of each other, characterized in that: the surgical end effector is selectively and detachably connected to a distal end portion of the adapter assembly; the first drive converter assembly includes an actuation shaft, the first drive converter assembly being configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the actuation shaft to drive said axial translation of the first drive member of the surgical end effector; and the second drive converter assembly includes an elongate tube, the second drive converter assembly being configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the elongate tube to drive said axial translation of the second drive member of the surgical end effector, wherein the actuation shaft is concentrically arranged within the elongate tube and configured for independent coaxial translation within the elongate tube. a powered actuator device including at least first and second rotatable drive shafts; a surgical end effector (40, 50, 60, 70) including at least first and second axially translatable drive members; and an adapter assembly selectively interconnecting the surgical end effector (40, 50, 60, 70) and the powered actuator device, the adapter assembly comprising: a first drive converter assembly configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the first drive member of the surgical end effector; and a second drive converter assembly configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the second drive member of the surgical end effector, the first drive converter assembly being at least partially disposed within the second drive converter assembly, wherein the first drive converter assembly and the second drive converter assembly are configured to rotate and translate independent of each other, a first drive converter assembly configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the first drive member of the surgical end effector; and a second drive converter assembly configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the second drive member of the surgical end effector, the first drive converter assembly being at least partially disposed within the second drive converter assembly, wherein the first drive converter assembly and the second drive converter assembly are configured to rotate and translate independent of each other, characterized in that: the surgical end effector is selectively and detachably connected to a distal end portion of the adapter assembly; the first drive converter assembly includes an actuation shaft, the first drive converter assembly being configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the actuation shaft to drive said axial translation of the first drive member of the surgical end effector; and the second drive converter assembly includes an elongate tube, the second drive converter assembly being configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the elongate tube to drive said axial translation of the second drive member of the surgical end effector, the surgical end effector is selectively and detachably connected to a distal end portion of the adapter assembly; the first drive converter assembly includes an actuation shaft, the first drive converter assembly being configured to convert a rotation of the first drive shaft of the powered actuator device into an axial translation of the actuation shaft to drive said axial translation of the first drive member of the surgical end effector; and the second drive converter assembly includes an elongate tube, the second drive converter assembly being configured to convert a rotation of the second drive shaft of the powered actuator device into an axial translation of the elongate tube to drive said axial translation of the second drive member of the surgical end effector, wherein the actuation shaft is concentrically arranged within the elongate tube and configured for independent coaxial translation within the elongate tube.