Flat washers protect surfaces by evenly distributing torque when a bolt or screw is tightened. They prevent corrosion between a steel screw and an aluminum surface. A nylon washer can be placed under a machine screw to reduce noise and abrasion and offer electrical insulation. Sealing washers are used for plumbing and hydraulic projects.MaiJin Metal Works | Custom CNC Machining Parts Manufacturer-CNC Milling Parts CNC Turned ComponentsOfficial website: https://www.chinamaijin.com/Email: mj@chinamaijin.com