Disc Spring, Belleville, 17-7 PH Stainless Steel, Min Inside Dia 0.755 In, Max Outside Dia 1.500 In, Thickness 0.107 In, Overall Height 0.134 In, Load 1398 Lbs, Deflection @ Load 0.013 In, Flat Load 892 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302