Disc Spring, Belleville, 302 Stainless Steel, Min Inside Dia 0.442 In, Max Outside Dia 0.875 In, Thickness 0.045 In, Overall Height 0.067 In, Load 275 Lbs, Deflection @ Load 0.011 In, Flat Load 495 Lbs, Meets/Exceeds ASI 302 and Government AMS Type 302, Package 6