ACTION SEAL TO DIN3760 R21 NBR25X47X7A

25x47x7-R21-NBR Rotary Shaft Seal - Nitrile Rubber (NBR) Metric 25 x 47 x 7Oil Seals or Rotary Shaft Seals are designed to provide a barrier to retain lubricant and to keep out contamination. They are available in metric and imperial sizes with a variety of sealing lip arrangements the most common of which are:R21 - Single Sprung LipR23 - Single Sprung Lip with the addition of a wiper lip to help keep out contamination Oil Seals are constructed using a steel case which is usually covered in rubber. Various materials are available the most common materials are:Nitrile Rubber (NBR) - Temperature Range -40 to +110 degree C - Usually coloured Black Viton Rubber (FPM) - Temperature Range -30 to +225 degrees C - Usually coloured Brown Silicone (SI) - Temperature Range -60 to +225 degrees C - Usually coloured Red