Disc and Belleville carries Belleville washer in imperial as well as metric sizes. Belleville washers also called conical spring washers are manufactured as per DIN 6796 and are designed specifically for Heavy Duty Bolted section such as Bus Bars, Transformers, Rectifiers, Heat Exchangers, Transmission, etc. These washers are intended to counteract the effect of setting which results in bolt/nut assemblies working loose.