Martin Bearing Maintenance
And Troubleshooting Guide

Bearing Suffixes C

 

Bearing Suffixes: A - B :: C :: D - F :: G - K :: L - N :: P - S :: T - Z

 

C
  1. Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing series 

    Examples:
    • 7210 C Single row angular contact ball bearing with 15° contact angle
    • 21306 C Spherical roller bearing with a flange-less inner ring, symmetrical rollers, loose guide ring and a pressed window-type steel cage
  2. Y-bearing with cylindrical outside diameter, e.g. YET 205 C
CA
  1. Spherical roller bearing of C design, but with retaining flanges on the inner ring and a machined cage
  2. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to- face will have an axial internal clearance smaller than Normal (CB) before mounting
CACSpherical roller bearing of CA design but with enhanced roller guidance 
CB
  1. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a Normal axial internal clearance before mounting
  2. Controlled axial clearance of a double row angular contact ball bearing

CC
  1. Spherical roller bearing of C design but with enhanced roller guidance
  2. Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have an axial internal clearance larger than Normal (CB) before mounting

CDSingle row angular contact ball bearing, optimized internal design, 15° contact angle 
CLNTapered roller bearing with tolerances corresponding to ISO tolerance class 6X 
CL0Inch tapered roller bearing with tolerances to class 0 according to ANSI-ABMA Standard 19.2:1994 
CL00Inch tapered roller bearing with tolerances to class 00 according to ANSI-ABMA Standard 19.2:1994
CL3Inch tapered roller bearing with tolerances to class 3 according to ANSI-ABMA Standard 19.2:1994
CL7CTapered roller bearing with special frictional behavior and heightened running accuracy
CNNormal internal clearance, normally only used together with an additional letter that identifies a reduced or displaced clearance range 

Examples:
  • CNH Upper half of the Normal clearance range
  • CNL Lower half of the Normal clearance range
  • CNM Two middle quarters of the Normal clearance range
  • CNP Upper half of the Normal and lower half of C3 clearance
  • CNR Cylindrical roller bearings with Normal clearance range to DIN 620-4:1982
The above letters H, L, M and P are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H 
CVFull complement cylindrical roller bearing with modified internal design
CSSheet steel reinforced contact seal of Acrylonitrile-Butadiene rubber (NBR) on one side of the bearing
2CSCS contact seal on both sides of the bearing
CS2Sheet steel reinforced contact seal of fluoro rubber (FKM) on one side of the bearing
2CS2CS2 contact seal on both sides of the bearing
CS5Sheet steel reinforced contact seal of hydrogenated Acrylonitrile-Butadiene rubber (HNBR) on one side of the bearing
2CS5CS5 contact seal on both sides of the bearing
C1Bearing internal clearance smaller than C2
C2Bearing internal clearance smaller than Normal
C3Bearing internal clearance greater than Normal
C4Bearing internal clearance greater than C3
C5Bearing internal clearance greater than C4
C02Reduced tolerance for running accuracy of inner ring of assembled bearing
C04Reduced tolerance for running accuracy of outer ring of assembled bearing
C08C02 + C04
C083C02 + C04 + C3
C10Reduced tolerance for the bore and outside diameters