Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.755 In, Max Outside Dia 1.500 In, Thickness 0.060 In, Overall Height 0.102 In, Load 460 Lbs, Deflection @ Load 0.021 In, Flat Load 600 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302