NTN - Ball and Roller Bearings

CYLINDRICAL
ROLLER
BEARING
NUMBERING
SYSTEM
(blank if standard)
1. TYPE
N: Straight outer ring with inner ring and roller assembly
NU: Straight inner ring with outer ring and roller assembly
NF: One lip outer ring with inner ring and roller assembly
NJ: One lip inner ring with outer ring and roller assembly
NH: NJ series bearing with HJ thrust collar (NJ+HJ=NH)
NN: Double row precision cylindrical bearings
HJ: Separate thrust collar
R, RN, RNU: Special cylindrical roller bearings
2. SERIES
10: Standard series cylindrical roller bearings
2: Standard series cylindrical roller bearings
22: Standard series cylindrical roller bearings
23: Standard series cylindrical roller bearings
3: Standard series cylindrical roller bearings
4: Standard series cylindrical roller bearings
6. INTERNAL CLEARANCE
C1: Radial clearance less than C2
C2: Radial clearance less than normal
No Suffix: Normal Radial Clearance
C3: Radial clearance greater than normal
C4: Radial clearance greater than C3
C5: Radial clearance greater than C4
CSXX: Special radial clearance;
XX is mean value in 0.001 mm units (µm)
NA: Radial clearance of cylindrical roller bearings
with non-interchangeable components
7. TOLERANCE
Normal: ISO class 0
P6: ISO class 6 (equivalent to RBEC 3)
P5: ISO class 5 (equivalent to RBEC 5)
P4: ISO class 4 (equivalent to RBEC 7)
3. INTERNAL DESIGN
E: High capacity cylindrical roller bearings
4. CHAMFER
Xn: Special chamfer, from 1 onward (X1, X2 . . .)
5. CAGE
F1: Machined steel cage
J: Pressed steel cage
G1: Machined brass cage
T2: Nylon cage
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