Disc Spring Metric Disc Spring High Carbon Steel Finish Phosphate Min Inside Dia 20.4mm Max Outside Dia 31.7mm Thickness 0.40mm Overall Height 1.1mm Load @ Deflection (Lbs.) 81N Deflection @ Load 0.52mm Meets/Exceeds GB/T 1222-2007 ASTM-A684 Package Quantity 10