THK RA12008UUC0 Cross Roller Bearing
RA12008UUC0 is a high-precision, thin-section cross-roller bearing from THK’s RAU series (integrated inner/outer ring type, interchangeable with RA series). It features cylindrical rollers arranged orthogonally in 90° V-grooves, separated by a spacer retainer, enabling a single bearing to support radial, axial, and moment loads in all directions.
RA12008UUC0 is a high-precision, thin-section cross-roller bearing from THK’s RAU series (integrated inner/outer ring type, interchangeable with RA series). It features cylindrical rollers arranged orthogonally in 90° V-grooves, separated by a spacer retainer, enabling a single bearing to support radial, axial, and moment loads in all directions. Designed for compact, lightweight equipment, it delivers exceptional rotational accuracy and rigidity.
Key Features
- Ultra-compact cross-section: Enables significant weight reduction and space saving in equipment.
- Integrated inner/outer ring: Supports both inner ring and outer ring rotation.
- Spacer retainer design: Low friction coefficient, stable rotational torque, and prevents roller skewing or locking.
- Dual-sided contact seals (UU): Prevents grease leakage and contamination, suitable for general industrial environments.
- Standard radial clearance (C0): Balances rotational smoothness and load capacity.
- High rigidity: Rigidity is 3–4 times higher than conventional ball bearing assemblies.
- Precision grade: JIS Class 0 (standard precision).
Official Specifications (Unit: mm, kN, kg)
| Parameter | Value |
|---|---|
| Model Number | RA12008UUC0 |
| Inner Diameter (d) | 120 |
| Outer Diameter (D) | 136 |
| Width (B) | 8 |
| Roller Pitch Circle Diameter (dp) | 127 |
| Lubrication Hole Width (B₁) | 1.5 |
| Minimum Chamfer (rₘᵢₙ) | 0.5 |
| Inner Ring Shoulder Diameter (dsₘₐₓ) | 123.5 |
| Outer Ring Shoulder Diameter (Dhₘᵢₙ) | 130.5 |
| Basic Dynamic Load Rating (C) | 7.84 |
| Basic Static Load Rating (C₀) | 16.5 |
| Mass | 0.17 |
| Material | Inner/outer ring & rollers: High-carbon chromium bearing steel; Retainer: Resin mold |
| Operating Temperature Range | -30°C to +80°C |
Applications
Ideal for precision rotating mechanisms requiring compactness and high accuracy, including:
- Industrial robot joints and rotary tables
- Precision machine tools and indexing tables
- Medical equipment and optical instruments
- Automation machinery and rotary actuators
