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Oil seal OS-A13



  • Elastomer-coated OD, flat
  • Non-spring-loaded sealing lip 
  • Protective lip against entry of contamination from outside (dust, dirt,...) ribbed OD available on request, type OS-G13

Special features

  • Non-spring-loaded lip design, for secondary sealing jobs e.g., grease sealing
  • Low friction
  • Compact design
  • Little installation space
  • Reliable static sealing inside housing
  • For housings with high thermal expansion, e.g., light metal housing
  • For split housings
  • For housings with increased surface roughness
  • No risk of fretting corrosion
  • Efficient protection against air side contaminations

Applications e.g.:

  • Secondary sealing jobs
  • Mechanical and apparatus engineering
  • Drive systems
  • Electric motors


Standard material

Elastomer NBR 70 black
Metal case Carbon steel according to DIN EN 10139

Special materials

Elastomer FKM
Metal case Stainless steel 1.4301

Application parameters

For the standard materials combination:

Temperature  -40°C to +100°C                                                                                           
Pressure depressurized
Shaft speed max. 6 m/s, and acc. to chart „Operating parameters for rotary shaft seals“
Media Mineral oil based lubricants, synthetic lubricants

When synthetic lubricants are used for which there is no empirical experience, test the compatibility in the laboratory or - better even - in practical trials. The operating temperature should not exceed 80°C.

Design information


Tolerance ISO h11
Hardness min. 45 HRC
Roughness Ra = 0,2 - 0,8 μm
Rz 1-5 μm 
Rmax ≤ 6,3 μm
Surface finish free of orientation (lead free)

Housing bore

Tolerance ISO H8
Roughness Ra = 1,6 - 6,3 μm 
Rz = 10 - 20 μm 
Rmax ≤ 25 μm


Please read our installation instructions.