In the pursuit of the ultimate balance between lightness and high performance in precision mechanical design, the ultra-thin XRA-C series cross roller bearings are your best choice. These bearings are designed for space-constrained and weight-sensitive applications.
The ultra-thin XRA-C series crossed roller bearings are high-precision, high-rigidity, ultra-thin rolling bearings. Their core feature is the use of cross-shaped cylindrical rollers, which are perpendicular to each other at 90° angles and alternate between the raceways. This design enables a single bearing to simultaneously withstand radial, axial, and overturning moments from all directions, simplifying the structure and significantly reducing installation space.
| Ultra thin XRA-C series crossed roller bearings | ||||||||||
| Nominal type | External dimension | Basic rated load | Weight | Corresponding type | ||||||
| （kN） | ||||||||||
| Internal diameter | Outside diameter | Width | Pitch Circle diameter of roller | Shoulder dimension | Radial direction | |||||
| d | D | B | Dpw | ds | Dh | C | Co | Kg | THK | |
| XRBT205 | 20 | 31 | 5 | 25.5 | 22.5 | 27 | 1.4 | 1.29 | 0.014 | RAU2005 |
| XRBT305 | 30 | 41 | 5 | 35.5 | 32.5 | 37 | 1.77 | 1.97 | 0.02 | RAU3005 |
| XRBT405 | 40 | 51 | 5 | 45.5 | 42.5 | 47 | 2 | 2.52 | 0.026 | RAU4005 |
| XRBT505 | 50 | 61 | 5 | 55.5 | 52.5 | 57 | 2.28 | 3.2 | 0.032 | RAU5005 |
| XRA5008C | 50 | 66 | 8 | 57 | 53.5 | 60.5 | 5.1 | 7.19 | 0.08 | RA5008C |
| XRA6008C | 60 | 76 | 8 | 67 | 63.5 | 70.5 | 5.68 | 8.68 | 0.09 | RA6008C |
| XRA7008C | 70 | 86 | 8 | 77 | 73.5 | 80.5 | 5.98 | 9.8 | 0.1 | RA7008C |
| XRA8008C | 80 | 96 | 8 | 87 | 83.5 | 90.5 | 6.37 | 11.3 | 0.11 | RA8008C |
| XRA9008C | 90 | 106 | 8 | 97 | 93.5 | 100.5 | 6.67 | 12.4 | 0.12 | RA9008C |
| XRA10008C | 100 | 116 | 8 | 107 | 103.5 | 110.5 | 7.15 | 13.9 | 0.16 | RA10008C |
| XRA11008C | 110 | 126 | 8 | 117 | 113.5 | 120.5 | 7.45 | 15 | 0.15 | RA11008C |
| XRA12008C | 120 | 136 | 8 | 127 | 123.5 | 130.5 | 7.84 | 16.5 | 0.17 | RA12008C |
| XRA13008C | 130 | 146 | 8 | 137 | 133.5 | 140.5 | 7.94 | 17.6 | 0.18 | RA13008C |
| XRA14008C | 140 | 156 | 8 | 147 | 143.5 | 150.5 | 8.33 | 19.1 | 0.19 | RA14008C |
| XRA15008C | 150 | 166 | 8 | 157 | 153.5 | 160.5 | 8.82 | 20.6 | 0.2 | RA15008C |
| XRA16013C | 160 | 186 | 13 | 172 | 165 | 179 | 23.3 | 44.9 | 0.59 | RA16013C |
| XRA17013C | 170 | 196 | 13 | 182 | 175 | 189 | 23.5 | 46.8 | 0.64 | RA17013C |
| XRA18013C | 180 | 206 | 13 | 192 | 185 | 199 | 24.5 | 49.8 | 0.68 | RA18013C |
| XRA19013C | 190 | 216 | 13 | 202 | 196 | 209 | 24.9 | 51.5 | 0.69 | RA19013C |
| XRA20013C | 200 | 226 | 13 | 212 | 205 | 219 | 25.8 | 54.7 | 0.71 | RA20013 |
1. Extremely Thin and Light, Saving Space
The significant advantage of the ultra-thin series crossed roller bearings lies in their extremely low profile and lightweight design. This makes them excellent for applications requiring compact layouts and reduced overall weight, such as robotic joints, precision rotary tables, medical devices, and aerospace equipment.
2. High Rigidity and High Precision
The crossed roller arrangement makes the bearings several times more rigid than conventional bearings. The high-density contact between the rollers and raceways ensures rotational accuracy and repeatability. Our XRA-C series bearings undergo rigorous precision control during the manufacturing process and offer ultra-high precision grades of P5, P4, and even P2, ensuring stability and reliability under high speeds and high loads.
3. Capable of Multi-Directional Loads
Thanks to their unique crossed roller structure, the ultra-thin XRA-C bearings can simultaneously support complex, combined loads. This eliminates the need for two or more conventional bearings to separately support radial and axial loads, simplifying the design and reducing potential sources of error.
4. High Speed and Low Friction
Despite their compact size, ultra-thin crossed roller bearings offer excellent high-speed performance. Optimized raceway geometry and precision manufacturing processes effectively reduce frictional torque, extend service life, and minimize heat generation.
Industrial robots and collaborative robots: Serving as joint bearings, they provide stable support for the robots' precise motion.
Medical equipment: Rotating components in medical imaging equipment such as CT and MRI ensure clear and accurate scans.
Semiconductor manufacturing equipment: Providing ultra-high-precision positioning and rotation in wafer processing and optical inspection equipment.
Precision measuring instruments: Used in various high-precision measuring stages and probes to ensure accurate measurement results.
Aerospace: Their lightweight and high-precision characteristics are crucial in satellite antennas, optical equipment, and navigation systems.
Selecting the right ultra-thin crossed roller bearing requires a comprehensive consideration of your specific application requirements:
Load type and magnitude: Evaluate the peak and average values of radial, axial, and moment loads.
Precision Requirement: Select the appropriate precision grade (P5, P4, P2) based on the equipment's application.
Operating Environment: Consider temperature, humidity, and the need for corrosion protection.
Installation Space: Select the appropriate inner diameter, outer diameter, and cross-section height based on your design.
Whether you're designing the next generation of precision robotics or looking for an optimal bearing solution for existing equipment, our ultra-thin XRA-C series crossed roller bearings are the ideal choice. We offer a variety of sizes and specifications, and we can customize them to meet your specific needs.
