Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.138 In, Max Outside Dia 0.281 In, Thickness 0.015 In, Overall Height 0.023 In, Load 36 Lbs, Deflection @ Load 0.004 In, Flat Load 62 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12