How are installation sizes of ball bearings standardised?

igu-blog-adm | 26. August 2019

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Many rolling bearings are available as sealed version. The sealing takes place according to the principle of the shaft seal. The following manufacturer-specific seal designations are possible:

  • Z = one-sided sheet metal cover disc with gap seal
  • ZZ/2Z = as above, from both sides
  • RS = one-sided, grinding rubber seal
  • LB = as above
  • 2RS = as above, from both sides
  • LLU = as above, non-contact rubber seal, from both sides
  • EE = as above, touching from both sides, grinding
  • RZ = one-sided, non-contact rubber seal
  • LB = as above
  • 2RZ = as above, from both sides
  • LLB = as above
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Ball bearings


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