... resistance 2.fatigue resistance 3.high-press resistance compressor oil seal for sd507(8353)/sd508(8390) Brand Name : ... spring (spring stainless steel is widely used in mechanical seals, rotary joints, aviation, aerospace, petroleum, chemical industry, printing and dyeing ... AC compressors, auto refrigerant, auto AC condensers, auto AC evaporator, auto AC receiver driers, auto AC expansion valves, etc. ...