Disc Spring, Belleville Spring Washer, Stainless Steel, Finish Plain, Min. Inside Dia. 0.505 In, Max. Outside Dia. 1 In, Thickness 0.043 In, Overall Height 0.071 In, Load at Deflection 250 Lbs., Deflection at Load 0.014 In, Calculated Load at Flat 431 Lbs., Package Quantity 10