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SKF Radial Shaft Seal (CR Seal) CRWH1 R - NBR

  • CRWH1 Seal with a double steel case, SKF WAVE lip, and a carbon steel garter spring.
  • The CRWH1 radial shaft seals, also called SKF Wave seals as part of the CR Seals assortment, are low-friction seals with SKF WAVE lip design for reduced heat generation.
  • They have a metal outside diameter for easy installation and a firm and accurate fit in the housing bore.

About Radial Shaft Seals - General

  • Some radial shaft seal designs have an auxiliary lip that protects the primary sealing lip from dust and other contaminants.
  • A suitable lubricant in the space between the primary sealing lip and the auxiliary lip can reduce wear and delay corrosion.
  • Contaminants that have passed the auxiliary lip will eventually cause damage to the counterface surface area.
  • A build-up of heat can also occur between the two lips, resulting in premature wear.
  • Radial shaft seals are used in a multitude of applications.
  • Radial shaft seals are used between rotating and stationary machine components or between two components in relative motion and consist of two main parts:

 A cylindrical outer covering of sheet steel (case)

  • A cylindrical outer covering of sheet steel (case) or an elastomer that has the requisite interference to seal statically against the housing bore.

 A Sealing

  • A sealing lip is made of an elastomeric or thermoplastic material that seals dynamically and statically against the shaft.
  • The lip has a sealing edge that is formed by moulding, cutting, or grinding.
  • It is normally pressed against the counterface surface of the shaft, with a defined radial load, by a garter spring.
  • The edge of the sealing lip and the shaft counterface surface form the most important functional area of a radial shaft seal.
  • The sealing effect of the lip can be enhanced by designing the contact area of the lip with hydrodynamic features.

About Nitrile Rubber

  • The term nitrile rubber is used in this publication for acrylonitrile-butadiene rubber (NBR).
  • This material has very good engineering properties and is a general-purpose sealing lip material.
  • It is a copolymer manufactured from acrylonitrile and butadiene that provides good resistance to the following media:
    • Most mineral oils and greases with a mineral oil base.
    • Normal fuels like gasoline, diesel, and light heating oils.
    • Animal and vegetable oils, fats, and hot water.
  • Nitrile rubber also tolerates short-term dry running of the sealing lip.
  • The permissible operating temperature range of nitrile rubber is –40 to +100°C (–40 to +210°F) for brief periods, temperatures of up to 120°C (250°F) can be tolerated.
  • SKF also offers a special nitrile rubber compound with a temperature range between –55 and +110°C (–65 and +230°F).


  • AIMS SKU A0162918
  • Brand SKF
  • Model Number 20538
  • System of Measurement Imperial
  • Seal Design CRWH1
  • Housing Bore Diameter - D (in) 2.842
  • Shaft Surface Speed Max. (m/s) 8.03
  • Operating Temperature Min. (°C) -40°C
  • Sealing Lip Technology SKF Wave
  • Design Outside Diameter Configuration Metal
  • Shaft Diameter - d1 (in) 2.063
  • Shaft Speed Max. (r/min) 2940
  • Type of Outside Diameter Metal-cased with Sealant Coating on the Outside Diameter
  • Material Code R
  • Nominal Seal Width - b (in) 0.438
  • Pressure Differential (n/mm²) 0.07
  • Operating Temperature Max. (°C) 100°C
  • Lip Material Nitrile Rubber (NBR)
  • Type Shaft Seal
SKU: A0162918

SKF Radial Shaft Seal CRWH1 R 2.063 x 2.842 x 0.438" Nitrile Rubber (NBR)

SKF Radial Shaft Seal (CR Seal) CRWH1 R - NBR


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