A forceps (10) includes an end effector assembly (100) having first (110) and second (120) jaw members. One or both jaw members (110,120) is movable relative to the other between a spaced-apart position and an approximated position for grasping tissue therebetween. One or both jaw members (110,120) includes an insulator (126) having at least one engagement knob (126c) extending therefrom and a tissue-sealing plate (112,122) including at least one engagement aperture (122b) extending therethrough and defining a tissue-sealing surface. The aperture (122b) is configured to receive the knob (126c) therein upon positioning of the tissue-sealing plate (122) atop the insulator (126) such that a free end of (126d) the knob (126c) extends through the engagement aperture (122b) and extends from the tissue-sealing surface. The knob (126c) is deformable from a first configuration to a second configuration, wherein the free end (126d) of the knob (126c) is permanently inhibited from passing through the aperture (122b), thereby engaging the insulator (126) and the jaw frame (124) to one another.
