Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.265 In, Max Outside Dia 0.562 In, Thickness 0.042 In, Overall Height 0.055 In, Load 400 Lbs, Deflection @ Load 0.010 In, Flat Load 567 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12