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Oil seal OS-ST18



  • Cassette seals, also available in other types
  • These seals are highly robust and rigid sealing systems
  • Often used in heavy dutp applications and dirty environments

Bijzondere eigenschappen

  • Cassette seals are fully encapsulated and on the inside they form a grease-filled labyrinth with several sealing and dirt lips (radial and axial)
  • The main sealing lip is spring-energised,  In this way the penetration of dirt, mud, water and dust is effectively prevented
  • The grease filling reduces wear, increases service life and thereby extends maintenance intervals for heavy-duty applications
  • The cassette seals also contain a fully pre-treated sealing contact surface
  • This means that the shaft does not have to be specially hardened and grounded
  • Additional dirt seals are not required either

Applications e.g.:

  • agricultural forestry
  • construction machinery
  • material handling equipment


Standard material

Elastomer NBR 70 black
Spring Spring steel according to DIN EN 10270-1
Metal case Carbon steel according to DIN EN 10139

Speciale materialen

Elastomer FKM
Spring Stainless steel 1.4301
Metal case Stainless steel 1.4301

Application parameters

For the standard materials combination

Temperature  -40°C to +100°C                                                                                           
Druk Drukloos, max. 0,05 MPa
Shaft speed max. 5 m/s, acc. to chart in „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.