A surgical instrument, comprising: (a) a body assembly including an outer sheath extending distally from the body; (b) an ultrasonic waveguide extending through the body assembly, wherein the waveguide extends within and through the outer sheath; (c) an ultrasonic blade connected to a distal end of the ultrasonic waveguide; (d) a clamp arm assembly configured to move from an opened position for receiving a tissue toward a closed position for clamping the tissue relative to the ultrasonic blade, wherein the clamp arm assembly includes: (i) a clamp body, and (ii) a clamp pad connected to the clamp body facing the ultrasonic blade; (e) a clamp arm actuator operatively connected to the clamp arm assembly and configured to selectively move from a first position toward a second position relative to the body to thereby respectively direct the clamp arm assembly from the opened position toward the closed position; and (f) at least one alignment feature (10300, 10306) connected to the body assembly and contacting the clamp arm assembly, wherein the at least one alignment feature is configured to control jaw offset and cross jaw between the clamp body and the ultrasonic blade, characterised in that the at least one alignment feature comprises a first alignment feature and a second alignment feature, wherein the first alignment feature is configured to connect with an inner surface of the outer sheath and further configured to contact the clamp body of the clamp arm assembly, wherein the clamp body is rotatably connected to the body assembly by a pivot coupling, and wherein the second alignment feature is an adjustable spacer located on the pivot coupling and configured to contact the clamp body and guide the clamp body into contact with the first alignment feature on the opposite side of the clamp body. (a) a body assembly including an outer sheath extending distally from the body; (b) an ultrasonic waveguide extending through the body assembly, wherein the waveguide extends within and through the outer sheath; (c) an ultrasonic blade connected to a distal end of the ultrasonic waveguide; (d) a clamp arm assembly configured to move from an opened position for receiving a tissue toward a closed position for clamping the tissue relative to the ultrasonic blade, wherein the clamp arm assembly includes: (i) a clamp body, and (ii) a clamp pad connected to the clamp body facing the ultrasonic blade; (i) a clamp body, and (ii) a clamp pad connected to the clamp body facing the ultrasonic blade; (e) a clamp arm actuator operatively connected to the clamp arm assembly and configured to selectively move from a first position toward a second position relative to the body to thereby respectively direct the clamp arm assembly from the opened position toward the closed position; and (f) at least one alignment feature (10300, 10306) connected to the body assembly and contacting the clamp arm assembly, wherein the at least one alignment feature is configured to control jaw offset and cross jaw between the clamp body and the ultrasonic blade, characterised in that the at least one alignment feature comprises a first alignment feature and a second alignment feature, wherein the first alignment feature is configured to connect with an inner surface of the outer sheath and further configured to contact the clamp body of the clamp arm assembly, wherein the clamp body is rotatably connected to the body assembly by a pivot coupling, and wherein the second alignment feature is an adjustable spacer located on the pivot coupling and configured to contact the clamp body and guide the clamp body into contact with the first alignment feature on the opposite side of the clamp body.