An injection molding machine includes a movable platen specifically adapted to uniformly distribute a clamp force to the mold half surfaces thereby reducing localized deflections and unwanted flash on the molded article. The mold movable platen (10) is adapted to be slidably carried on at least one rail (40) of an injection molding machine (11), the platen (10) comprising: a substantially rectangular front face (12) specially adapted to carry a mold half (26a); a back face (14) parallel to and spaced from the front face (12) specifically adapted to interface with a clamp (20), said clamp being attached substantially in the center of the back face and applying a force substantially perpendicular to the front face (12); a wall (46,48) having a predetermined thickness and height protruding rearward from the periphery of the front face; a plurality of spaced apart ribs (18) extending in a predetermined pattern between and interconnecting each of the back face (14), the wall (46,48) and the front face (12), wherein the force from the clamp (20) is substantially uniformly transmitted from the back face to the front face thereby creating a uniform sealing pressure distribution during clamp-up.