Disc Spring Belleville 302 Stainless Steel Min Inside Dia 0.281 In Max Outside Dia 0.875 In Thickness 0.050 In Overall Height 0.066 In Load 310 Lbs Deflection @ Load 0.013 In Flat Load 445 Lbs Meets/Exceeds ASI 302 and Government AMS Type 302 Package 6