L. V. Engineering Co. Manufactures Heavy Disc Spring Washers. L. V. Engineering Co. Also manufactures various types of locking devices. These Spring Washers are made of high carbon spring steel. The Heavy Disc Spring Washers have dimensional consistency. These Spring Washers are made in factory fully equipped with modern machinery and heat-treatment plant plus testing equipment. These Spring Washers undergoes a thorough check-up, chain-wise, right from the selection of materials to the final finishing stage.