Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.317 In, Max Outside Dia 0.625 In, Thickness 0.032 In, Overall Height 0.048 In, Load 142 Lbs, Deflection @ Load 0.008 In, Flat Load 260 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12