IKO CRBT505AC1 Super Slim Cross Roller Bearing
CRBT505AC1 is an ultra‑slim, high‑rigidity crossed roller bearing from IKO’s CRBT series, engineered for space‑constrained precision applications. It features cylindrical rollers alternately crossed at 90° between precision‑ground inner and outer rings, guided by a precision separator retainer. This design enables the bearing to support radial, axial, and moment loads simultaneously in an extremely compact form factor.
CRBT505AC1 is an ultra‑slim, high‑rigidity crossed roller bearing from IKO’s CRBT series, engineered for space‑constrained precision applications. It features cylindrical rollers alternately crossed at 90° between precision‑ground inner and outer rings, guided by a precision separator retainer. This design enables the bearing to support radial, axial, and moment loads simultaneously in an extremely compact form factor. The unit is factory‑equipped with separator‑type retainer (A) and C1 radial internal clearance, delivering exceptional rigidity, rotational accuracy, and minimal deflection.
Official Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Model | CRBT505AC1 | — |
| Inner Diameter (d) | 50 | mm |
| Outer Diameter (D) | 61 | mm |
| Width (B) | 5 | mm |
| Minimum Chamfer (rₘᵢₙ) | 0.15 | mm |
| Shaft Mounting Diameter (da) | 52.5 | mm |
| Housing Mounting Diameter (Da) | 57 | mm |
| Basic Dynamic Load Rating (C) | 2,280 | N |
| Basic Static Load Rating (C₀) | 3,200 | N |
| Mass | 32.3 | g (0.0323 kg) |
| Retainer | Separator‑type (A) | Precision roller guidance |
| Internal Clearance | C1 | Small radial internal clearance |
| Material | High‑carbon chromium bearing steel (SUJ2) | — |
| Operating Temperature | -20°C to +110°C | Standard service range |
| Accuracy Class | JIS Class 0 (P0) | ISO 492 / ABEC 1 |
| Lubrication | Factory‑filled lithium‑base grease | Non‑relubricatable (no oil holes) |
| Structure | Integral inner/outer rings | Ultra‑slim one‑piece construction |
Key Design Features
- Ultra‑Slim Profile: Compact dimensions (50×61×5 mm) ideal for space‑limited installations.
- Exceptional Rigidity: Crossed roller arrangement provides 3–4 times higher rigidity than double‑row angular contact ball bearings in the same envelope.
- Multi‑Directional Load Capacity: Single bearing supports radial, axial, and moment loads, simplifying system design.
- Precision Separator Retainer: Maintains roller alignment, reduces friction, and ensures stable rotational torque.
- C1 Clearance: Factory‑set small radial clearance guarantees high rotational accuracy and minimal backlash.
- Integral Ring Design: One‑piece inner/outer rings for enhanced rigidity and simplified mounting.
- Pre‑Greased: Factory‑lubricated for immediate use, no additional lubrication required.
Typical Applications
- Industrial robot joints and manipulator arms
- Precision rotary tables for machine tools
- Semiconductor manufacturing and inspection equipment
- Medical diagnostic and imaging devices
- Optical positioning systems and measuring instruments
- High‑precision automation modules and rotary stages
Model Code Explanation (IKO Standard)
| Code | Meaning |
|---|---|
| CRBT | Super Slim Type Crossed Roller Bearing |
| 50 | Inner diameter = 50 mm |
| 5 | Width = 5 mm |
| A | Separator‑type retainer |
| C1 | Small radial internal clearance |
