A surgical instrument includes a shaft defining a proximal end, a distal end, an interior surface, and an exterior surface. The shaft includes a pair of channels defined in the interior surface thereof towards the distal end of the shaft. A drive member is movably disposed within the shaft. An end effector assembly is pivotably coupled to the shaft towards the distal end of the shaft. A cam pin operably couples the end effector assembly and the drive member such that movement of the drive member relative to the shaft manipulates the end effector assembly. Ends of the cam pin extend outwardly from the end effector assembly and are received within the channels of the shaft to guide movement of the cam pin relative to the shaft in response to movement of the drive member relative to the shaft.