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Schaeffler Group FAG cylindrical roller bearings developed the TB roller to significantly increase the bearing operating life under axial load. The special torus-shaped curvature of the end faces of this roller enables loads to be distributed across a significantly greater surface area. This reduced surface pressure provides a number of benefits:
• The permissible axial load for semi-locating and locating bearings is increased by a factor of 1.5 compared with standard bearings (now Fa / Fr ≤ 0.6 compared with Fa / Fr ≤ 0.4 previously)
• Lower bearing temperatures, since the frictional torque under axial load is reduced by up to 50 %
• Significantly less wear on the rollers under axial load due to improved lubricant film formation
• Bearings have a longer operating life under axial load
FAG supply new TB bearings with its proven two-piece brass cage M1 as standard; the new MPAX cage is also optionally available. They have completely revised the bearing design for all series with MPAX cages, which mean the benefits of the TB roller really come into their own. The dimensions and tolerances of these new cage bearings correspond with DIN 5412.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 6221NR NSK | 105 | 190 | 36 |
| 6218N NSK | 90 | 160 | 30 |