Disc Spring Belleville 302 Stainless Steel Min Inside Dia 0.164 In Max Outside Dia 0.343 In Thickness 0.019 In Overall Height 0.028 In Load 55 Lbs Deflection @ Load 0.005 In Flat Load 93 Lbs Meets/Exceeds ASI 302 and Government AMS Type 302 Package 12