A surgical instrument, comprising: (a) an end effector; (b) a shaft assembly extending proximally from the end effector along a longitudinal axis, wherein the shaft assembly includes: (i) an acoustic waveguide extending along the longitudinal axis; (ii) a knob operatively connected to the acoustic waveguide, wherein the knob is configured to be selectively rotated and thereby rotate the acoustic waveguide; and (c) an integral torque wrench positioned internally to the knob and connected to the knob via a releasable coupling such that the integral torque wrench is configured to rotate with the knob, wherein the integral torque wrench comprises a body, a compressible member configured to compress in a distal direction from an elongated state to a compressed state, and a cam, wherein one of the compressible member and the cam extend from the body and the other of the compressible member and the cam extend from the knob, wherein the releasable coupling is configured to transmit torque from the integral torque wrench to the knob up to a predetermined torque, wherein the compressible member is engaged with the cam to transmit the torque therethrough, wherein the cam is configured to compress the compressible member as the torque being transmitted therethrough is increased, and wherein the releasable coupling is configured to release the knob as the transmitted torque exceeds the predetermined torque, wherein the compressible member is configured to slip from the cam to disengage the compressible member from the cam as the torque being transmitted therethrough exceeds the predetermined torque such that the integral torque wrench rotatably slips relative to the knob for inhibiting the transmission of torque through the knob from exceeding the predetermined torque while coupling the acoustic waveguide to an ultrasonic transducer assembly. (a) an end effector; (b) a shaft assembly extending proximally from the end effector along a longitudinal axis, wherein the shaft assembly includes: (i) an acoustic waveguide extending along the longitudinal axis; (ii) a knob operatively connected to the acoustic waveguide, wherein the knob is configured to be selectively rotated and thereby rotate the acoustic waveguide; and (i) an acoustic waveguide extending along the longitudinal axis; (ii) a knob operatively connected to the acoustic waveguide, wherein the knob is configured to be selectively rotated and thereby rotate the acoustic waveguide; and (c) an integral torque wrench positioned internally to the knob and connected to the knob via a releasable coupling such that the integral torque wrench is configured to rotate with the knob, wherein the integral torque wrench comprises a body, a compressible member configured to compress in a distal direction from an elongated state to a compressed state, and a cam, wherein one of the compressible member and the cam extend from the body and the other of the compressible member and the cam extend from the knob, wherein the releasable coupling is configured to transmit torque from the integral torque wrench to the knob up to a predetermined torque, wherein the compressible member is engaged with the cam to transmit the torque therethrough, wherein the cam is configured to compress the compressible member as the torque being transmitted therethrough is increased, and wherein the releasable coupling is configured to release the knob as the transmitted torque exceeds the predetermined torque, wherein the compressible member is configured to slip from the cam to disengage the compressible member from the cam as the torque being transmitted therethrough exceeds the predetermined torque such that the integral torque wrench rotatably slips relative to the knob for inhibiting the transmission of torque through the knob from exceeding the predetermined torque while coupling the acoustic waveguide to an ultrasonic transducer assembly.