Disc Spring Belleville 17-7 PH Stainless Steel Min Inside Dia 0.630 In Max Outside Dia 1.875 In Thickness 0.086 In Overall Height 0.129 In Load 744 Lbs Deflection @ Load 0.022 In Flat Load 70 Lbs Meets/Exceeds ASI 302 and Government AMS Type 302 Package 1