Disc Spring, Belleville, High Carbon Steel, Min Inside Dia 0.531 In, Max Outside Dia 1.250 In, Thickness 0.125 In, Overall Height 0.143 In, Load 2780 Lbs, Deflection @ Load 0.014 In, Flat Load 860 Lbs, Meets/Exceeds ASTM-A684, Package 12