Abstract: A folding knife has a handle and a blade with a working end and a tang, the blade being coupled to the handle and pivotable relative to the handle about a fold axis between an open position and a closed position. A toggle is coupled to the handle and pivotable relative to the handle about a toggle axis, the toggle axis being located a radial distance from the fold axis. A free end of the toggle has an open lock face located a radial distance from the toggle axis. A primary lock face on the tang is located on the opposite side of the fold axis from the working end. When the blade is in the open position, the open lock face engages the primary lock face to prevent rotation of the blade toward the closed position.