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