The Bearing Area Between Screw and Nut is defined as the area of contact of one thread, between one mating pair of screw and nut. And is denoted by Ab. Bearing Area Between Screw and Nut is usually measured using the Square Millimeter for Area. Note that the value of Bearing Area Between Screw and Nut is always positive. Typically, the value of Bearing Area Between Screw and Nut is greater than 0.