Disc Spring, Belleville, High Carbon Steel, Min Inside Dia 0.567 In, Max Outside Dia 1.125 In, Thickness 0.056 In, Overall Height 0.084 In, Load 410 Lbs, Deflection @ Load 0.014 In, Flat Load 1846 Lbs, Meets/Exceeds ASTM-A684, Package 12