Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.156 In, Max Outside Dia 0.312 In, Thickness 0.011 In, Overall Height 0.022 In, Load 19 Lbs, Deflection @ Load 0.006 In, Flat Load 27 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 12