Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.406 In, Max Outside Dia 0.875 In, Thickness 0.089 In, Overall Height 0.100 In, Load 1290 Lbs, Deflection @ Load 0.009 In, Flat Load 1871 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 6