| B20 | Reduced width tolerance |
| C3 | Bearing internal clearane greater than Normal (CN) |
| C4 | Bearing internal clearance greater than C3 |
| C4H | Bearing internal clearance greater than C3(upper half of C4
clearance) |
| C5 | Bearing internal clearance greater than C4 |
| C5H | Bearing internal clearance greater than C4(upper half of C5
clearance) |
| CA | 1 Spherical roller bearing of C design.but with retaining flanges
on the inner ring and a machined cage |
2.Singl row angular contact ball bearings for universal matching.
Two bearings arranged back-to-face will have an axial internal
clearance smaller than Normal(CB) before mounting |
| CB | 1.Single row angular contact ball bearings 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 |
| CL7C | High-performance design for tapered roller bearings in pinion
arrangements |
| DB | Matched single row tapered roller bearing pair, arranged
back-to-back. |
| A number immediately following the DB identifies the design of the
intermediate rings |
| DF | Matched single row tapered roller bearing pair, arranged
face-to-face. |
| A number immediately following the DF identifies the design of the
intermediate ring |
| DT | Matched single row tapered roller bearing pair, arranged in tandem.
A number immediately following the DT identifies the design of the
intermediate rings |
| EC | Optimized internal design incorporating more and/or larger rollers
and with modified roller end/flange contact |
| G | Single row angular contact ball bearing for universal matching. Two
bearings arranged back-to-back or face-to-face will have a "Normal"
axial clearance |
| MA | Machined brass cage, outer ring centred, used for oil lubrication |
| ML,MP | Machined one-piece window-type brass cage, outer ring centred, used
for oil lubrication |
| MR | Machined one-piece window-type brass cage, rolling element centred |
| MR3D | Machined one-piece window-type brass cage, special design |
| N | Snap ring groove in the outer ring |
| N1 | One locating slot (notch) in one outer ring side face |
| N2 | Two locating slots (notches) 180.apart in one outer ring side face |
| N3 | Snap ring groove in the outer ring,one locating slot (notch) in one
outer ring side face |
| P4 | Dimensional and running accuracy to IS0 tolerance class 4 |
| GA | Single row angular contact ball bearing for universal matching. |
| Two bearings arranged back-to-back or face-to-face will have a
light preload |
| GB | Single row angular contact ball bearing for universal matching. |
| Two bearings arranged back-to-back or face-to-face will have a
moderate preload |
| GC | Single row angular contact ball bearing for universal matching. |
| Two bearings arranged back-to-back or face-to-face will have a
heavy preload |
| P5 | Dimensional and running accuracy to IS0 tolerance class 5 |
| P54 | P5 +C4 |
| P6 | Dimensional and running accuracy to IS0 tolerance class 6 |
| P63 | P6 +C3 |
| P64 | P6 + C4 |
| P65H | P6+C5H |
| Q | Optimized contact geometry and surface finish |
| RS1 | Sheet steel reinforced contact seal of acrylonitrile-butadiene
rubber (NBR) on one side of the bearing |
| 2RS1 | RS1 contact seal on both sides of the bearing |
| HA | Case-hardened bearing or bearing components. For closer
identification, HAis followed by one of the following figures |
| 0: Complete bearing |
| 1:Outer and inner rings |
| 2:Outer ring |
| 3:Inner ring |
| 4: Outer ring, inner ring and rolling elements |
| 5: Rolling elements |
| 6:Outer ring and rolling elements |
| 7:Inner ring and rolling elements |
| HB | Bainite-hardened bearing or bearing component.For closer
identification,HB is followed by one of the figures explained under
HA |
| HC | Bearing or bearing components of ceramic. For closer
identification, HC is followed by one of the figures explained
under HA |
| Example: HC5 Rolling elements made of silicon nitride |
| J,J1, J2 | Pressed window-type steel cage |
| M | Machined brass cage, rolling element centred |
| RSH | Sheet steel reinforced contact seal of acrylonitrile-butadiene
rubber (NBR) on one side of the bearing |
| 2RSH | RSH contact seal on both sides of the bearing |
| RSL | Sheet steel reinforced low-friction contact seal of
acrylonitrile-butadiene rubber (NBR) on one side of the bearing |
| 2RSL | RSL low-friction contact seal on both sides of the bearing |
| RZ | Sheet steel reinforced low-friction seal of acrylonitrile-butadiene
rubber (NBR) |
| 2RZ | RZ low-friction seal on both sides of the bearing |
| S0 | Bearing rings or washers dimensionally stabilized up to +150 ℃ |
| T | T, followed by a figure, identifies the total width of single row
tapered roller bearing pairs arranged back-to-back or in tandem |
| TNH | Injection moulded cage of glass fibre reinforced
polyetheretherketone (PEEK), rolling element centred |
| TN9 | Injection moulded cage of glass fibre reinforced polyamide 66,
rolling element centred |
| V... | V combined with a second letter,identifies a variant group, and
followed by a three-or four-figure number denotes variants not
covered by "standard” designation suffixes. |
| VA:Application oriented variants |
| VB: Boundary dimension deviations |
| VE: External or internal deviations |
| VL: Coatings |
| VQ: Quality and tolerances other than standard |
| VS: Clearance and preload |
| VT: Lubrication |
| VU: Miscellaneous applications |
| Z | Shield of pressed sheet steel on one side of the bearing |
| 2Z | Z shield on both sides of the bearing |
