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SKF Radial Shaft Seal (CR Seal) HMSA10 RG - NBR

  • Radial shaft seals for general industrial applications, radial shaft seals sit between rotating and stationary components, or two components in relative motion.
  • They have two main parts, one is a cylindrical outer covering with an interference fit that seals statically against the housing bore.
  • The second, a sealing lip, seals dynamically and statically against the shaft.
  • Its sealing edge presses against the counterface surface of the shaft with a defined radial load.
  • With Auxiliary Lip, Nitrile Rubber.
  • Auxiliary Lip: Non-Contacting.

About Applications and Operating Conditions (HMS5 and HMSA10)

  • HMS5 and HMSA10 seals are designed for oil or grease lubricated applications with operating temperatures ranging from –40 to +100 °C (–40 to +210°F), short-term up to 120°C (250°F).
  • These seals are also appropriate for sealing lubricants within a wide range of viscosities.
  • Circumferential Speed: up to 14 m/s (2 755 ft/min).
  • Operating Pressure Max: 0.03 MPa (5psi).
  • These values are the maximum value for each service condition and should not occur together.
  • Consideration should be given as to how the operating conditions affect each other.

About Design SKF Radial Shaft Seal (HMS5 and HMSA10 Seals)

  • The rubbers outside diameter provide the optimized sealing ability in the housing, also at considerable surface roughness or in split housings.
  • The beads on the outside diameter provide improved sealing ability and retention in the bore.
  • They also prevent spring-back during installation.
  • The spring-loaded sealing lip contributes to a quick response in handling dynamic runout and maintaining the sealing performance, even when sealing lip wear is excessive.
  • The sealing lip and flex section are optimally balanced to withstand both high dynamic runout and shaft-to-bore misalignment.
  • The auxiliary lip on HMSA10 seals is non-contacting, which means that the seals normally can operate at the same speeds as the single-lip HMS5 seals.

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 A0161250
  • Brand SKF
  • Model Number 25*42*10 HMSA10 RG
  • Shaft Diameter - d1 (mm) 25
  • Permissible Operating Temp Short Periods Max (°C) 120°C
  • Shaft Speed Max. (r/min) 3840
  • Seal Designation With Auxiliary Lip, Nitrile Rubber
  • Type of Outside Diameter Rubber Metal Reinforced
  • Sealing Lip Technology SKF Edge
  • Seal Width - b (mm) 10
  • Pressure Differential (n/mm²) 0.03
  • Operating Temperature Max. (°C) 100°C
  • Auxiliary Lip Non-Contacting
  • Lip Material Nitrile Rubber (NBR)
  • Material Code RG
  • Housing Bore Diameter - D (mm) 42
  • Shaft Surface Speed Max. (m/s) 5.03
  • Operating Temperature Min. (°C) -40°C
  • Compliance with Standard ISO 6194, DIN 3760
  • Seal Design Code HMSA10
  • Desisgn Outside Diameter Configuration Rubber
  • Type Shaft Seal
SKU: A0161250 On Sale

SKF Radial Shaft Seal HMSA10 RG 25 x 42 x 10mm Nitrile Rubber - Pack of 2

SKF Radial Shaft Seal (CR Seal) HMSA10 RG - NBR

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