THK RU85UUC0P5 Cross Roller Ring
RU85UUC0P5 is a high‑precision, integrated cross‑roller bearing (cross‑roller ring) from THK’s RU series. It features cylindrical rollers alternately arranged at 90° in precision‑ground raceways, guided by a spacer retainer. This design enables the bearing to support radial, axial, and moment loads simultaneously in a single, compact unit.
RU85UUC0P5 is a high‑precision, integrated cross‑roller bearing (cross‑roller ring) from THK’s RU series. It features cylindrical rollers alternately arranged at 90° in precision‑ground raceways, guided by a spacer retainer. This design enables the bearing to support radial, axial, and moment loads simultaneously in a single, compact unit. The model is factory‑equipped with double non‑contact rubber seals (UU), standard radial internal clearance (C0), and P5 precision grade, delivering exceptional rotational accuracy, rigidity, and contamination resistance for high‑precision motion systems.
Official Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Model | RU85UUC0P5 | — |
| Inner Diameter (d) | 55 | mm |
| Outer Diameter (D) | 120 | mm |
| Width (B) | 15 | mm |
| Roller Pitch Circle Diameter (dp) | 85 | mm |
| Minimum Chamfer (r₁ₘᵢₙ / r₂ₘᵢₙ) | 0.6 | mm |
| Basic Dynamic Load Rating (C) | 20.3 | kN |
| Basic Static Load Rating (C₀) | 29.5 | kN |
| Mass | 1.0 | kg |
| Seal Type | UU | Double non‑contact rubber seals (both sides) |
| Internal Clearance | C0 | Standard radial internal clearance |
| Retainer | Spacer retainer | Roller guidance |
| Material | High‑carbon chromium bearing steel (SUJ2) | — |
| Operating Temperature | -30°C to +80°C | Standard service rangeTHK |
| Accuracy Class | P5 | ISO 492 / ABEC 5 precision gradeTHK |
| Lubrication | Factory‑filled AFB‑LF grease | Grease lubrication, non‑relubricatableTHK |
| Inner Ring Mounting | 8‑M5 threaded holes | — |
| Inner Ring PCD (PCD1) | 65 | mm |
| Outer Ring Mounting | 8‑φ5.5 through holes, φ9.5 counterbore (depth 5.4) | — |
| Outer Ring PCD (PCD2) | 105 | mm |
Key Design Features
- Integrated Ring Structure: One‑piece inner and outer rings with pre‑drilled mounting holes eliminate the need for separate flanges, simplifying installation and ensuring stable performance.
- Crossed Roller Arrangement: 90° alternating roller placement provides exceptional rigidity and allows a single bearing to withstand multi‑directional loads.
- High Precision (P5): P5‑grade accuracy ensures minimal radial and axial runout, critical for precision positioning applications.
- Non‑Contact Sealing (UU): Double non‑contact seals prevent dust and moisture ingress while minimizing rotational torque.
- Standard Clearance (C0): Factory‑set C0 radial clearance guarantees consistent rotational performance and load distribution.
- Spacer Retainer: Precision spacer retainer maintains roller alignment, reduces friction, and enhances smooth rotation.
- Dual Rotation Capability: Suitable for both inner and outer ring rotation, offering design flexibility.
Typical Applications
- Industrial robot joints and rotary actuators
- Precision rotary tables and indexing devices
- Semiconductor manufacturing and inspection equipment
- Medical diagnostic and surgical robots
- Optical positioning systems and measuring instruments
- High‑precision automation modules and rotary stages
Model Code Explanation (THK Standard)
| Code | Meaning |
|---|---|
| RU | Integrated cross‑roller ring (mounting‑holed type) |
| 85 | Roller pitch circle diameter = 85 mm |
| UU | Double non‑contact rubber seals (both sides) |
| C0 | Standard radial internal clearance |
| P5 | ISO P5 / ABEC 5 precision grade |
