An electrosurgical forceps, comprising: a first shaft member including a first inner frame, (114, 28124, 30124) a first jaw member extending distally from the first inner frame, and a first outer housing supported by the first inner frame, wherein the first inner frame includes a first member stamped from sheet metal; a second shaft member including a second inner frame (124, 28114, 30114), a second jaw member extending distally from the second inner frame, and a second outer housing supported by the second inner frame, wherein the second inner frame includes a second member /28115a) stamped from sheet metal and a rigid filler member disposed on the second member; a pivot member pivotably coupling the first and second inner frames of the first and second shaft members to each other such that pivoting of the first and second shaft members relative to one another between spaced-apart and approximated positions pivots the first and second jaw members relative to one another between open and closed positions; a knife selectively translatable through the first shaft member from a retracted position to an extended position wherein the knife extends at least partially between the first and second jaw members; a knife deployment mechanism operably coupled to the first shaft member, the knife deployment mechanism including at least one trigger and at least one linkage coupling the at least one trigger with the knife such that pivoting of the at least one trigger relative to the first shaft member translates the knife between the retracted and extended positions; and a knife lockout including a cantilever arm biased towards a locked position inhibiting distal translation of the knife, the cantilever arm movable upon approximation of the first and second jaw members from the locked position to an unlocked position to permit distal translation of the knife wherein the second inner frame further includes a first overhang member extending from an upper end of the second inner frame, the first overhang member configured to secure the rigid filler member to the second inner frame. a first shaft member including a first inner frame, (114, 28124, 30124) a first jaw member extending distally from the first inner frame, and a first outer housing supported by the first inner frame, wherein the first inner frame includes a first member stamped from sheet metal; a second shaft member including a second inner frame (124, 28114, 30114), a second jaw member extending distally from the second inner frame, and a second outer housing supported by the second inner frame, wherein the second inner frame includes a second member /28115a) stamped from sheet metal and a rigid filler member disposed on the second member; a pivot member pivotably coupling the first and second inner frames of the first and second shaft members to each other such that pivoting of the first and second shaft members relative to one another between spaced-apart and approximated positions pivots the first and second jaw members relative to one another between open and closed positions; a knife selectively translatable through the first shaft member from a retracted position to an extended position wherein the knife extends at least partially between the first and second jaw members; a knife deployment mechanism operably coupled to the first shaft member, the knife deployment mechanism including at least one trigger and at least one linkage coupling the at least one trigger with the knife such that pivoting of the at least one trigger relative to the first shaft member translates the knife between the retracted and extended positions; and a knife lockout including a cantilever arm biased towards a locked position inhibiting distal translation of the knife, the cantilever arm movable upon approximation of the first and second jaw members from the locked position to an unlocked position to permit distal translation of the knife wherein the second inner frame further includes a first overhang member extending from an upper end of the second inner frame, the first overhang member configured to secure the rigid filler member to the second inner frame.