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