Disc Spring, Belleville, High Carbon Steel, Min Inside Dia 0.317 In, Max Outside Dia 0.625 In, Thickness 0.022 In, Overall Height 0.042 In, Load 69 Lbs, Deflection @ Load 0.010 In, Flat Load 1350 Lbs, Meets/Exceeds ASTM-A684, Package 12