With the Cross-Roller Bearing, cylindrical rollers are arranged crosswise, with each roller perpendicular to the adjacent roller, in a 90 ゜ V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including, radial, axial and moment loads.
| Part Number | RA12008 Bearing |
| Bearing Type | Crossed Roller Bearings |
| Interchange | CRBS 1208 Bearings |
| Construction | Single Row,Combined Radial; Thrust; and Moment |
| Seal Type | Open |
| ABEC Rating | ABEC-5, ABEC-7, ABEC-9 |
| Ring Material | Steel |
| Roller Material | Steel |
| Shaft dia. mm | 120 |
| Mass(kg) | 0.17 |
| Bore Dia (d) | 120 |
| Outer Dia (D) | 136 |
| Width (B) | 8 |
Since the Cross-Roller Ring achieves high rigidity despite the minimum possible dimensions of the inner and outer rings, it is optimal for applications such as joints and swiveling units of industrial robots, swiveling tables of machining centers, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments and IC manufacturing machines.
● High Rotation Accuracy of RA 12008 Cross Roller Bearing/ CRBS 1208 Bearings
● Easy Handling
The inner and outer rings, which are separable, are secured to the Cross-Roller Ring body after the rollers and spacer retainers are installed. This procedure prevents the rings from separating from each other. Thus, it is easy to handle the rings when installing the Cross-Roller Ring.
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| Major dimensions | Shoulder dimensions | Basic load rating | Mass |
| Shaft diameter |
| (radial) |
| TKW | Model No. | Inner diameter | Outer diameter | Roller pitch circle diameter |
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| d | D | dp | Width | Greasing hole |
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| C | C0 |
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| B B1 | a | b | rmin | ds | Dh | kN | kN | kg |
| 50 | RA 5008 | 50 | 66 | 57 | 8 | 2 | 0.8 | 0.5 | 53.5 | 60.5 | 5.1 | 7.19 | 0.08 |
| 60 | RA 6008 | 60 | 76 | 67 | 8 | 2 | 0.8 | 0.5 | 63.5 | 70.5 | 5.68 | 8.68 | 0.09 |
| 70 | RA 7008 | 70 | 86 | 77 | 8 | 2 | 0.8 | 0.5 | 73.5 | 80.5 | 5.98 | 9.8 | 0.1 |
| 80 | RA 8008 | 80 | 96 | 87 | 8 | 2 | 0.8 | 0.5 | 83.5 | 90.5 | 6.37 | 11.3 | 0.11 |
| 90 | RA 9008 | 90 | 106 | 97 | 8 | 2 | 0.8 | 0.5 | 93.5 | 100.5 | 6.76 | 12.4 | 0.12 |
| 100 | RA 10008 | 100 | 116 | 107 | 8 | 2 | 0.8 | 0.5 | 103.5 | 110.5 | 7.15 | 13.9 | 0.14 |
| 110 | RA 11008 | 110 | 126 | 117 | 8 | 2 | 0.8 | 0.5 | 113.5 | 120.5 | 7.45 | 15 | 0.15 |
| 120 | RA 12008 | 120 | 136 | 127 | 8 | 2 | 0.8 | 0.5 | 123.5 | 130.5 | 7.84 | 16.5 | 0.17 |
| 130 | RA 13008 | 130 | 146 | 137 | 8 | 2 | 0.8 | 0.5 | 133.5 | 140.5 | 7.94 | 17.6 | 0.18 |
| 140 | RA 14008 | 140 | 156 | 147 | 8 | 2 | 0.8 | 0.5 | 143.5 | 150.5 | 8.33 | 19.1 | 0.19 |
| 150 | RA 15008 | 150 | 166 | 157 | 8 | 2 | 0.8 | 0.5 | 153.5 | 160.5 | 8.82 | 20.6 | 0.2 |
| 160 | RA 16013 | 160 | 186 | 172 | 13 | 2.5 | 1.6 | 0.8 | 165 | 179 | 23.3 | 44.9 | 0.59 |
| 170 | RA 17013 | 170 | 196 | 182 | 13 | 2.5 | 1.6 | 0.8 | 175 | 189 | 23.5 | 46.5 | 0.64 |
| 180 | RA 18013 | 180 | 206 | 192 | 13 | 2.5 | 1.6 | 0.8 | 185 | 199 | 24.5 | 49.8 | 0.68 |
| 190 | RA 19013 | 190 | 216 | 202 | 13 | 2.5 | 1.6 | 0.8 | 195 | 209 | 24.9 | 51.5 | 0.69 |
| 200 | RA 20013 | 200 | 226 | 212 | 13 | 2.5 | 1.6 | 0.8 | 205 | 219 | 25.8 | 54.7 | 0.71 |
When you purchase the crossed roller bearings, please confirm the designation first.
1. Model RU (Integrated Inner/Outer Ring Type)
2. Model RB (Separable Outer Ring Type for Inner Ring Rotation)
3. Model RE (Separable Inner Ring Type for Outer Ring Rotation)
4. USP-Grade Series of Models RB/RE
5. Model RA (Separable Outer Ring Type for Inner Ring Rotation)
6. Model RA-C (Single-Split Type)
Features of Crossed Roller Bearings RA 12008/CRBS 1208
1. Excellent rotation accuracy
2. Simplified operation and installation
3. Withstand large axial and radial loads
4. Significantly save installation space
5. High speed capability
6. Reduce shaft length and processing costs, thermal expansion causes limited changes in geometric dimensions
7. Adopt nylon divider, low moment of inertia, low starting torque, easy to control angle indexing
8. Optimize the pre-tightening force, the rigidity is large, and the guiding roller has high precision
9. Carburized steel provides excellent impact resistance and surface abrasion resistance
10. Simple but well lubricated
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