Disc Spring Belleville 302 Stainless Steel Min Inside Dia 0.505 In Max Outside Dia 1.000 In Thickness 0.035 In Overall Height 0.067 In Load 174 Lbs Deflection @ Load 0.051 In Flat Load 260 Lbs Meets/Exceeds ASI 302 and Government AMS Type 302 Package 12