Taper roller bearings are used in a variety of industrial applications. They consist of an inner ring, outer ring, and tapered rollers. Proper installation is important for long life and performance. Bearings must be carefully fitted and mounted, ensuring correct tolerances, preload, and lubrication to transfer loads efficiently.

1. Taper Roller Bearings

2. Taper Roller Bearings

3. Taper Roller Bearing Components

4. Geometry
Bearing
axis
Apex

5. Dimension Series
Diameter series
Width series

6. Shaft Tolerances
Shaft Shaft diameter tolerances
diameter
(Nominal g6 h6 j6 k6 m6 n6 p6
bearing bore
diameter) Adjusted values for bearing with inch dimensions
over incl. high low high low high low high low high low high low high low
mm µm
10 18 +4 –7 +10 –1 +18 +7 +22 +11 +28 +17 +33 +22 +39 +28
18 30 +4 –9 +11 –2 +20 +7 +26 +13 +32 +19 +39 +26 +46 +33
30 50 +3 –13 +12 –4 +23 +7 +30 +14 +37 +21 +45 +29 +54 +38
50 76,2 +4 –15 +14 –5 +26 +7 +35 +16 +44 +25 +53 +34 +65 +46
76,2 80 +10 –9 +20 +1 +32 +13 +41 +22 +50 +31 +59 +40 +71 +52
80 120 +11 –11 +23 +1 +36 +14 +48 +26 +58 +36 +68 +46 +82 +60
120 180 +11 –14 +25 0 +39 +14 +53 +28 +65 +40 +77 +52 +93 +68
180 250 +15 –14 +30 +1 +46 +17 +63 +34 +76 +47 +90 +61 +109 +80

7. Housing Tolerances
Housing Housing bore tolerances
bore
diameter
(Nominal H7 J7 J6 K6 K7 M6 M7 N7 P7
bearing out-
side diameter) Adjusted values for bearing with inch dimensions
over incl. high low high low high low high low high low high low high low high low high low
mm µm
24 30 +37 +16 +28 +7 +24 +11 +18 +5 +22 +1 +12 –1 +16 –5 +9 –12 +2 –19
30 50 +42 +17 +31 +6 +27 +11 +20 +4 +24 –1 +13 –3 +17 –8 +9 –16 0 –25
50 80 +48 +18 +36 +6 +31 +12 +22 +3 +27 –3 +13 –6 +18 –12 +9 –21 –3 –33
80 120 +56 +21 +43 +8 +37 +15 +25 +3 +31 –4 +15 –7 +21 –14 +11 –24 –3 –38
120 150 +62 +22 +48 +8 +40 +15 +26 +1 +34 –6 +14 –11 +22 –8 +10 –30 –6 –46
150 180 +65 +25 +51 +11 +43 +18 +29 +4 +37 –3 +17 –8 +25 –15 +13 –27 –3 –43
180 250 +71 +25 +55 +9 +47 +18 +30 +1 +38 –8 +17 –12 +25 –21 +11 –35 –8 –54

8. Load Capability
Load
conditions
Angle
series

9. Design range for Taper Roller Bearings
Single row bearing
Back-to-back arrangement Face-to-face arrangement
Designation suffix DB Designation suffix DF
Double row bearing
TDO configuration TDI configuration
Four-row bearing
TQO configuration TQI configuration

10. Roller Forces
Qe = Outer ring/
roller contact force
Qi = Inner ring/
roller contact force
Qf = Roller/
flange contact force

11. Effects of Axial and Radial Loads
QR = External radial load
QA = Internal induced axial load

12. Life Performance
Calculated life
–25 –10 25
Preload Clearance
–25 –10 25
Bearing setting Load distribution

13. Roller End/Flange Contact
Sliding
Outer ring
Roller/flange
contact point
Roller
Inner ring

14. Stress Distribution in Raceway Contact
straight circular crowning logarithmic crowning
light load
heavy load
heavy load
+
misalignment

15. Application: Commercial Vehicle

16. Application: Worm Gearbox

17. Application: Double Reduction Final Drive Unit

18. Application: Cone Crusher

19. Application: Work Roll in Cold Strip Rolling Mill

20. Check Machine Drawings and Fits

21. Preparation for Efficient Dismounting

22. Before Fitting Bearings

23. Matched Set Arrangement
Face-to-face Back-to-back Tandem
arrangement arrangement arrangement
Designation suffix DF Designation suffix DB Designation suffix DT

24. Fitting in Wheel Hub: Cold Mounting

25. Fitting in Wheel Hub: Cone Assembly

26. Fitting in Wheel Hub: Apply Nut

27. Fitting in Wheel Hub: Dial Gauge

28. Fitting on Rotating Shaft: Tight Fit
Axial clearance

29. Fitting on Rotating Shafts: Face-to-Face
Shims
Cover

30. Fitting on Rotating Shafts: Back-to-Back
Telescopic sleeve
Larger
Distance sleeve