An electromechanical surgical system 10 is provided including a hand-held surgical instrument 100； an end effector 400； and a shaft assembly 200 for selectively interconnecting the end effector and the surgical device. The shaft assembly includes a transmission housing 212； an outer tubular body 210； a distal neck housing 236 for interconnecting a rotatable drive member 268 of the surgical instrument and a rotation receiving member 426 supported in the end effector, wherein the distal neck housing includes at least one gear system 280 configured to convert a rotational input of the rotatable drive member into at least two output forces to the end effector； and an articulating neck assembly 230 interconnecting the tubular body 210 and the distal neck housing. The articulating neck assembly enables off-axis articulation of the distal neck assembly, and wherein the rotatable drive member extends through the articulating neck assembly.
