Metric Steel Belleville Spring Washer, 1.969"(50.0mm) Outer Diameter, 0.882"(22.4mm) Inner Diameter.079"(2.0mm) Thickness, 5,222 Newtons Max. Load (Pack of 10)$$Hardware

Metric-Disc-Spring DIN2093 Belleville-Spring Conical-Spring M50-Disc-SpringYou may also like 1/2" x 24" Lag Screws/Steel/Zinc / 5 Pc. Carton.