The RSU series crossed roller bearings were created to meet these challenges. As a precision bearing that integrates innovative design and superior performance, the XRSU series stands out in many high-precision applications due to its unique structure.
The XRSU series crossed roller bearing is a specially designed precision bearing. Its characteristic feature is that the internal rollers are arranged in a 90° V-pattern and separated by a spacer. This unique cross-arrangement allows a single bearing to simultaneously support radial loads, axial loads, and overturning moments. Compared to traditional combinations of two or more bearings, the XRSU series bearings not only significantly simplify the design, but also significantly reduce installation space, while providing higher rigidity and rotational accuracy.
| Nominal type | Basic size（mm） | Mounting dimensions（mm） | Basic rated load（kN） | Weight | Corresponding type | ||||||||
| Axial Direction | Radial direction | ||||||||||||
| Da | di | Di | da | La | Li | nB1 | Dynamic State Ca | Static state Coa | Dynamic State Cr | Static state Cor | Kg | INA | |
| XRSU168 | 205 | 130 | 174 | 159 | 190 | 145 | 12 | 65 | 243 | 41.4 | 119 | 3.3 | XSU080168 |
| XRSU188 | 225 | 150 | 194 | 179 | 210 | 165 | 16 | 70 | 270 | 44.5 | 133 | 3.7 | XSU080188 |
| XRSU218 | 255 | 180 | 224 | 208 | 240 | 195 | 20 | 76 | 315 | 48 | 154 | 4.3 | XSU080218 |
| XRSU258 | 295 | 220 | 264 | 249 | 280 | 235 | 24 | 83 | 370 | 53 | 182 | 5.1 | XSU080258 |
| XRSU318 | 355 | 280 | 324 | 309 | 340 | 295 | 28 | 94 | 465 | 60 | 228 | 6.3 | XSU080318 |
| XRSU398 | 435 | 360 | 404 | 389 | 420 | 375 | 36 | 106 | 580 | 67 | 285 | 7.8 | XSU080398 |
1. Ultra-High Rigidity and High Precision
The XRSU series utilizes line contact between rollers and raceways, effectively eliminating the elastic deformation caused by point contact in traditional bearings, resulting in ultra-high rotational rigidity. Furthermore, rigorous manufacturing processes ensure rotational accuracy reaches P5, P4, and P2 levels, making it ideal for applications requiring the highest precision, such as CNC machine tool rotary tables, industrial robot joints, and medical equipment.
2. Strong Load Capacity
Due to the cross-shaped roller arrangement, XRSU bearings can withstand loads from all directions within a compact footprint. Their unique structure enables them to simultaneously withstand combined loads such as radial, axial, and overturning moments, significantly simplifying mechanical design. This strong load capacity makes the XRSU series a reliable choice for heavy and high-load conditions.
3. Simplified Design and Compact Structure
The thin-walled design of the XRSU crossed roller bearing makes it lighter and more compact than traditional bearings. In many applications, a single XRSU bearing can replace a set of two angular contact ball bearings or tapered roller bearings. This not only reduces the number of components but also simplifies the installation process, effectively lowering design and assembly costs.
XRSU series crossed roller bearings, with their superior performance, are widely used in the following high-precision equipment:
Industrial robots: Robot joints, rotary axes, and servo motor reducers.
CNC machine tools: CNC rotary tables, tool spindles, and milling centers.
Medical equipment: CT scanners, MRI machines, and medical robotic arms.
High-precision measuring equipment: Measuring instruments, optical instruments, and high-precision rotary tables.
Semiconductor manufacturing equipment: Wafer processing equipment and photolithography machines.
We offer a full range of XRSU crossed roller bearings and can customize them to meet your specific needs. Whether you're looking for standard models or special sizes, our team of experts can provide professional selection advice and technical support.
