Product name: Combination washer Executive standard: JB982-77 Material: carbon steel+NBR Rubber Specifications: Order per inside diameter specs Product Usage: Combination gasket, composed of rubber and metal, appropriate for sealing strain systems in oil founded pipeline systems, including welding, clamping, growth pipe joints, screw plugs, and mechanical devices. To forestall leakage of oil, fuel, water, and drugs, the nominal stress is as much as 40MPa, and the working temperature is -25 ℃~+100 ℃