INA XSU080188 Crossed Roller Bearing
The INA XSU080188 is a high-precision, face-mount crossed roller bearing belonging to the XSU 08 series (Integrated Inner/Outer Ring Type with Mounting Holes) from Schaeffler Group. This advanced bearing design features cylindrical rollers arranged perpendicular to each other in 90° V-grooves, separated by a precision spacer retainer, enabling it to simultaneously accommodate radial, axial, and moment loads from all directions while maintaining exceptional rotational accuracy and rigidity.
The INA XSU080188 is a high-precision, face-mount crossed roller bearing belonging to the XSU 08 series (Integrated Inner/Outer Ring Type with Mounting Holes) from Schaeffler Group. This advanced bearing design features cylindrical rollers arranged perpendicular to each other in 90° V-grooves, separated by a precision spacer retainer, enabling it to simultaneously accommodate radial, axial, and moment loads from all directions while maintaining exceptional rotational accuracy and rigidity. The integrated inner and outer ring construction with pre-machined mounting holes on both rings eliminates the need for special flanges or housings, simplifying installation and ensuring stable performance. The bearing is equipped with double-sided lamellar seals, providing effective protection against contamination and retaining lubrication for extended service life under normal operating conditions.
Model Coding Explanation
| Code | Meaning |
|---|---|
| XSU | Integrated Inner/Outer Ring Type Crossed Roller Bearing with Mounting Holes (INA designation) |
| 08 | Series designation (constant cross-section series with 25.4 mm width) |
| 0188 | Dimension code (Inner diameter 150 mm, Outer diameter 225 mm, Width 25.4 mm) |
| (Seal) | Double-sided lamellar seals (factory-lubricated for life under normal conditions) |
| (Precision Class) | Standard precision class with axial and radial runout of 0.01 mm (10 μm), meeting strict INA accuracy standards for rotational precision |
Key Specifications
| Parameter | Value |
|---|---|
| Model Number | XSU080188 |
| Inner Diameter (d) | 150 mm (INA official dimension data) |
| Outer Diameter (D) | 225 mm (INA official dimension data) |
| Width (B) | 25.4 mm (INA official dimension data) |
| Roller Pitch Circle Diameter (dp) | 187.5 mm (calculated from official INA dimension data) |
| Mounting Holes - Inner Ring | 12 holes, PCD 165 mm, threaded holes (INA official mounting specification) |
| Mounting Holes - Outer Ring | 12 holes, PCD 210 mm, through holes with counterbores (INA official mounting specification) |
| Basic Dynamic Load Rating - Axial (Ca) | 71 kN (71000 N) (INA official load rating data) |
| Basic Dynamic Load Rating - Radial (Cr) | 45 kN (45000 N) (INA official load rating data) |
| Basic Static Load Rating - Axial (Coa) | 270 kN (270000 N) (INA official load rating data) |
| Basic Static Load Rating - Radial (C0r) | 105 kN (105000 N) (INA official load rating data) |
| Mass | 3.7 kg (INA official weight specification) |
| Limiting Speed | 200 r/min (INA official speed rating data) |
| Sealing System | Double-sided lamellar seals - factory-lubricated with high-performance grease |
| Material | High carbon chromium bearing steel (100Cr6, DIN 17230) (INA official material specification) |
| Operating Temperature Range | -30°C to +120°C (INA official operating temperature specification) |
| Rotation Capability | Suitable for both inner-ring rotation and outer-ring rotation applications |
| Minimum Radius (rmin) | 1.1 mm (INA official dimension data) |
| Precision Class | Standard precision with axial and radial runout of 0.01 mm (10 μm) |
| Preload Setting | Factory-set between 0.002 mm and 0.010 mm (INA official preload specification) |
| Lubrication Points | Four lubrication nipples in the outer ring (two on the circumference and two on the mounting face) |
Structural Features
- Integrated Inner/Outer Ring Design: Both rings are one-piece construction, eliminating the need for special flanges or housings, providing exceptional rigidity and stability compared to split-ring designs. This structure ensures minimal deformation under load and maintains consistent rotational accuracy.
- Face-Mount Configuration: Pre-machined mounting holes on both rings allow direct bolting to equipment, simplifying installation and reducing assembly time. Mounting has virtually no effect on performance, ensuring stable, accurate rotation and torque.
- Crossed Roller Arrangement: Ensures uniform load distribution across all rollers, maximizing load capacity while minimizing overall bearing size. This design provides significantly higher rigidity than traditional ball bearing arrangements, making it ideal for applications requiring high tilting moment capacity.
- Spacer Retainer Technology: Prevents roller contact and cage locking, improving reliability, reducing friction, and extending service life compared to traditional steel plate retainers. The retainer also ensures proper roller alignment for smooth, precise rotation.
- Dual-Direction Load Capacity: Capable of handling radial, axial, and moment loads simultaneously from any direction, making it ideal for complex motion applications where multiple load types are present.
- Double-Sided Lamellar Seals: Factory-installed lamellar seals provide excellent protection against dust, dirt, and moisture ingress while retaining lubrication. This eliminates the need for frequent re-lubrication and extends maintenance intervals under normal operating conditions.
Applications
The XSU080188 is ideally suited for applications requiring compact dimensions, high rigidity, precise rotation control, and enhanced contamination protection:
- Industrial robot joints and rotary components operating in general industrial environments
- Precision rotary tables for machine tools and metrology equipment requiring high tilting moment capacity
- Medical devices (e.g., diagnostic scanners, surgical robots, imaging systems) needing contamination-free operation
- Semiconductor and IC manufacturing equipment with strict cleanliness requirements
- Measuring instruments and optical devices requiring long-term lubrication retention
- Medium-sized precision automation systems and manipulators in general industrial environments
- Compact rotary indexing tables and positioning mechanisms requiring high rigidity and accuracy
- Machine tool rotary axes and other precision motion control applications
Installation & Maintenance Guidelines
- Mounting: Secure directly to equipment using appropriate bolts for both inner and outer rings without special housing or presser flanges. Ensure mounting surfaces are flat, parallel, and clean to maintain bearing accuracy. Torque bolts to INA's recommended specifications for optimal performance. All locating holes should be used to ensure high stiffness and load capability.
- Preload: Factory-set radial clearance/preload between 0.002 mm and 0.010 mm provides optimal performance for most applications; additional preload can be applied if required by specific operating conditions following INA's technical guidelines.
- Lubrication: Double-sided lamellar sealed version is factory-lubricated with high-performance grease under normal conditions. Can be relubricated through the lubrication nipples or through lubrication ducts in the adjacent construction after removing the nipples.
- Operating Limits: Avoid shock loads and excessive speeds beyond the rated 200 r/min to ensure maximum service life and maintain precision performance.
- Accuracy Assurance: Mounting surfaces should have a flatness tolerance of ≤ 2 μm and parallelism tolerance of ≤ 3 μm to maintain the bearing's rotational accuracy (axial and radial runout ≤ 10 μm).
- Seal Care: Do not damage the lamellar seals during installation. If seals become damaged, replace the bearing or consult INA for repair options.
