A surgical stapling apparatus, comprising: a housing assembly; and an elongated shaft assembly selectively attachable to the housing assembly, the elongated shaft assembly including: an adapter assembly extending distally to a distal tip Z housing, the distal tip housing supporting an adapter electrical connector assembly therein; and a loading unit selectively attachable to the adapter assembly and extending distally to an end effector supporting at least one sensor therein, the loading unit supporting a loading unit electrical connector assembly therein, the loading unit electrical connector assembly positioned to contact the adapter electrical connector assembly when the adapter assembly and the loading unit are coupled together to electrically couple the at least one sensor to the housing assembly wherein the adapter electrical connector assembly includes an adapter connector housing that rotatably supports a firing rod therethrough; wherein the adapter electrical connector assembly includes an electronic ring assembly that is supported on the adapter connector housing; charaterized in that the adapter connector housing includes a connector shaft that supports the electronic ring assembly thereon; wherein the connector shaft defines a plurality of annular ribs and a plurality of ring recesses disposed between the annular ribs, the plurality of ring recesses and the plurality of annual ribs positioned to support a plurality of contact rings of the electronic ring assembly. a housing assembly; and an elongated shaft assembly selectively attachable to the housing assembly, the elongated shaft assembly including: an adapter assembly extending distally to a distal tip Z housing, the distal tip housing supporting an adapter electrical connector assembly therein; and a loading unit selectively attachable to the adapter assembly and extending distally to an end effector supporting at least one sensor therein, the loading unit supporting a loading unit electrical connector assembly therein, the loading unit electrical connector assembly positioned to contact the adapter electrical connector assembly when the adapter assembly and the loading unit are coupled together to electrically couple the at least one sensor to the housing assembly wherein the adapter electrical connector assembly includes an adapter connector housing that rotatably supports a firing rod therethrough; wherein the adapter electrical connector assembly includes an electronic ring assembly that is supported on the adapter connector housing; charaterized in that the adapter connector housing includes a connector shaft that supports the electronic ring assembly thereon; wherein the connector shaft defines a plurality of annular ribs and a plurality of ring recesses disposed between the annular ribs, the plurality of ring recesses and the plurality of annual ribs positioned to support a plurality of contact rings of the electronic ring assembly. an adapter assembly extending distally to a distal tip Z housing, the distal tip housing supporting an adapter electrical connector assembly therein; and a loading unit selectively attachable to the adapter assembly and extending distally to an end effector supporting at least one sensor therein, the loading unit supporting a loading unit electrical connector assembly therein, the loading unit electrical connector assembly positioned to contact the adapter electrical connector assembly when the adapter assembly and the loading unit are coupled together to electrically couple the at least one sensor to the housing assembly wherein the adapter electrical connector assembly includes an adapter connector housing that rotatably supports a firing rod therethrough; wherein the adapter electrical connector assembly includes an electronic ring assembly that is supported on the adapter connector housing; charaterized in that the adapter connector housing includes a connector shaft that supports the electronic ring assembly thereon; wherein the connector shaft defines a plurality of annular ribs and a plurality of ring recesses disposed between the annular ribs, the plurality of ring recesses and the plurality of annual ribs positioned to support a plurality of contact rings of the electronic ring assembly.