A forceps includes an end effector assembly having first and second jaw members. One or both jaw members is movable relative to the other between a spaced-apart position and an approximated position for grasping tissue therebetween. One or both jaw members includes an insulator having at least one engagement knob extending therefrom and a tissue-sealing plate including at least one engagement aperture extending therethrough and defining a tissue-sealing surface. The aperture is configured to receive the knob therein upon positioning of the tissue-sealing plate atop the insulator such that a free end of the knob extends through the engagement aperture and extends from the tissue-sealing surface. The knob is deformable from a first configuration to a second configuration, wherein the free end of the knob is permanently inhibited from passing through the aperture, thereby engaging the insulator and the jaw frame to one another.
