a thermoplastic endless belt has a smooth outer surface substantially free of discontinuities and an inner surface with a plurality of teeth at a given belt pitch . the teeth are adapted to engage a sprocket with circumferentially spaced sheaves at a sprocket pitch greater than the belt pitch . the belt is slightly stretchable so that the sprocket can drive the endless belt when engaging the teeth within a range of load on the belt . the belt is preferred for use in conveyors in food processing industries where the smooth outer surface can transport food items and is easier to clean and keep free of impurities .