Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.255 In, Max Outside Dia 0.500 In, Thickness 0.018 In, Overall Height 0.034 In, Load 47 Lbs, Deflection @ Load 0.008 In, Flat Load 70 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12