Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.328 In, Max Outside Dia 0.687 In, Thickness 0.052 In, Overall Height 0.068 In, Load 630 Lbs, Deflection @ Load 0.013 In, Flat Load 892 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12