A Belleville Washer, also known as a Conical Spring Washer, Disc Spring Washer, Belleville Spring Washer or Cupped Spring Washer, is a type of spring that is shaped like a washer. It's shape gives the washer a spring characteristic. The benefits of Belleville washers include a long service lie, no setting or fatigue under normal loads and stresses, low creep tendency, high load capacity, efficient use of space and high spring forces with low spring height. Belleville washers can be stacked to modify the spring constant or the amount of deflection to better meet a variety of application needs. Belleville washers are available in spring steel, stainless steel and 410 stainless steel.