Technical Articles

RHP (NSK) Bearing Codes

rhp nsk baring marking codes  

Often we would like to know the specifications of an RHP bearing and what the codes stamped on the bearing mean. For example what does one, or more, small circles like ‘C2’ or ‘0’ engraved or stamped on the side of the bearing mean? Or what is the difference between MRJA

C2 Radial clearance less than Normal – marked ‘0’ or ‘C2’
CN Normal grade of radial internal clearance – not marked or marked ‘CN’
C3 Radial internal clearance greater than Normal – marked ‘000’ or ‘C3’
C4 Radial internal clearance greater than C3 – marked ‘0000’ or ‘C4’
C4 Radilal internal clearance greater than C4 – marked ‘00000’ or ‘C5’

Or what is the difference between MRJA and MMRJA?

Search out in RHP reference:
 Inch series radial ball bearings or Inch series cylindrical roller bearings
Click on the link above to read what all those codes mean!