Shaft Diameter 8mm RJ40 Crossed Roller Bearing 8X40X8mm Precision
Robot Bearing
The RJ40 bearing is designed for high-precision rotational motion,
featuring crossed cylindrical rollers arranged at right angles to
provide exceptional rigidity and load-bearing capacity. Key
features include:
- Outer Diameter: 40 mm
- Bore Diameter: 8 mm
- Width:8mm
- Structure: Integrated compact design supporting radial, axial, and moment
loads in any direction.
- Installation: Simplified by eliminating the need for a mounting flange.
The RJ40 bearing excels in applications requiring high performance
and reliability, offering superior stiffness and load capacity
while simplifying installation.
| Part Number | RJ40 |
| Measurement System | Metric |
| Bearing Type | Roller Bearing |
| Roller Bearing Type | Crossed |
| For Load Direction | Combined Load |
| Construction | Single Row |
| Seal Type | Open |
| Bore Diameter | 8 mm |
| Outer Diameter | 40 mm |
| Width | 8 mm |
| Holes | With Holes |
| Ring Material | Steel |
| Roller Material | Steel |
| Basic Dynamic Load Rating(C) | 3020N |
| Basic Static Load Rating (Co) | 3780N |
| Lubrication | Required |
| Shaft Mount Type | Press Fit |
| Temperature Range | 0 -230 °F |
| ABEC Rating | ABEC5/7/9 (P5,P4,P2) |
| RoHS | Compliant |
| REACH | Compliant |
| Weight | 0.06kg |
What's the Performance Features of RJ40 Crossed Roller Bearing?
High Precision: Achieves P4 and P2 precision levels, ensuring exceptional
rotational accuracy and stability.
High Rigidity: Features preloaded design to enhance structural stiffness and
performance.
High Load Capacity: Capable of supporting bi-directional axial loads, radial loads,
and tilting moments, making it suitable for complex loading
conditions.
Compact Design: Its small size helps save valuable space in machine tools without
compromising performance.
What's the Applications of the RJ40 Crossed Roller Bearing?
The RU series crossed roller bearings are widely used in fields
with stringent requirements for space and performance, thanks to
their high rigidity, precision, and compact design. Specific
applications include:
1. Industrial Robots
Joints and Rotating Parts: The integrated inner/outer ring structure with mounting holes
makes the RU series easy to install and capable of handling
multi-directional loads, making them ideal for critical movement
parts like waist joints and rotating arm joints in industrial
robots.
Collaborative Robots: The ultra-thin design suits compact collaborative robots,
especially at wrist and elbow joints, ensuring precise repeat
positioning.
2. Machine Tools and Processing Equipment
CNC Rotary Tables: Used in rotary tables of machining centers, providing stable
rotational accuracy and load capacity, supporting operations such
as high-precision milling and grinding.
Spindle Systems: Some high-speed machine tool spindles use RU series bearings due
to their low friction and high rigidity, enhancing machining
efficiency.
3. Medical and Precision Instruments
Medical Imaging Equipment: Devices like CT scanners and MRI machines rely on the high
cleanliness and low vibration characteristics of these bearings for
accurate imaging.
Optical Instruments: Applied in high-precision measuring instruments and laser cutting
equipment, ensuring precise control over minute displacements.
4. Automation and Inspection Equipment
Robotic Arms and Rotary Tables: In automated production lines, they are used in the rotating
joints of material handling robotic arms or indexing rotary tables,
improving the continuity and reliability of actions.
Semiconductor Manufacturing: Precision rotary platforms in IC packaging equipment and wafer
dicing machines require the high rigidity and anti-micro-vibration
performance of RU series bearings.
5. Aerospace and Special Fields
Radar and Satellites: RU bearings are utilized in satellite antenna adjustment
mechanisms or radar rotating bases, meeting extreme temperature
conditions and high reliability requirements.
Drone Gimbals: Lightweight designs cater to the dynamic balance needs of drone
camera gimbals.
RU Series (Integrated Inner/Outer Ring Type) Crossed Roller Bearing
The RU series bearings feature provided mounting holes, eliminating
the need for a presser flange or housing. Additionally, with an
integrated inner/outer ring structure and equipped with washers,
their performance is minimally impacted by the mounting procedure.
This ensures stable rotation accuracy and torque.
This model supports both inner-ring rotation and outer-ring
rotation, offering high flexibility and adaptability.
Bearing Number | Dimensions(mm) | Mounting Size | Basic Load Rating(N) | Inner Ring Mounting Hole | Outer Ring Mounting Hole | Reference
Weight(Kg) |
| Inner Diameter | Outer Diameter | Width | Chamfer | Dynamic | Static | Hole Center | Hole size | Hole Center | Hole size |
| d | D | B | r(min) | da | Da | Cr | Cor | dn | do | Dn | Do | Wt ≈ |
| RJ40 | 8 | 40 | 8 | 0.3 | 26 | 28 | 3020 | 3780 | 20 | 4-M3 | 34 | 6-ф2.8-ф4.6/凵2.8 | 0.06 |
| RU208 | 8 | 44 | 8 | 0.3 | 26 | 32 | 3020 | 3780 | 16 | 4-M3 | 38 | 4-ф3-ф 5/凵3 | 0.08 |
| RU28 | 10 | 52 | 8 | 0.3 | 24 | 29.5 | 2900 | 3400 | 16 | 4-M3 | 42 | 6-ф3.4-ф6.5/凵3.3 | 0.12 |
| RU42 | 20 | 70 | 12 | 0.6 | 37 | 47 | 7350 | 8350 | 28 | 6-M3 | 57 | 6-ф3.4-ф6.5/凵3.3 | 0.29 |
| RU52 | 30 | 80 | 12 | 0.6 | 46.5 | 58.5 | 8610 | 10600 | 35 | 6-M3 | 67 | 6-ф3.4-ф6.5/凵3.3 | 0.40 |
| RU66 | 35 | 95 | 15 | 0.6 | 59 | 74 | 17500 | 22300 | 45 | 8-M4 | 83 | 8-Φ4.5-Φ 8/凵4.3 | 0.62 |
| RU85 | 55 | 120 | 15 | 0.6 | 79 | 93 | 20300 | 29500 | 65 | 8-M5 | 105 | 8-Φ5.5-Φ9.5/凵5.4 | 1.00 |
| RU124 | 80 | 165 | 22 | 1 | 114 | 134 | 33100 | 50900 | 97 | 10-M5 | 148 | 10-Φ5.5-Φ9.5/凵5.4 | 2.60 |
| RU178 | 115 | 240 | 28 | 1.5 | 161 | 195 | 80300 | 13500 | 139 | 12-M8 | 217 | 12-Φ8.6-Φ14/凵8.6 | 6.80 |
| CRBTF105A | 10 | 43 | 5 | 0.15 | 12.5 | 38.5 | 2800 | 2500 | 16 | 6-M2.5 | 35 | 6-ф2.8-ф4.6/凵2.8 | 0.09 |
| CRBTF305A | 30 | 63 | 5 | 0.15 | 33.5 | 58.5 | 5040 | 4500 | 36 | 8-M2.5 | 55 | 8-ф2.8-ф4.6/凵2.8 | 1.20 |
| CRBT305-41A | 30 | 41 | 5 | 0.15 | 33.5 | 36.5 | 3640 | 3250 | - | 0.08 |
| RA5008C | 50 | 66 | 8 | 0.5 | 53.5 | 60.5 | 5100 | 7190 | - | 0.08 |
| RA6008C | 60 | 76 | 8 | 0.5 | 63.5 | 70.5 | 5680 | 8680 | - | 0.09 |
| RA7008C | 70 | 86 | 8 | 0.5 | 73.5 | 80.5 | 5980 | 9800 | - | 0.10 |
| RA8008C | 80 | 96 | 8 | 0.5 | 83.5 | 90.5 | 6370 | 11300 | - | 0.11 |
| RA9008C | 90 | 106 | 8 | 0.5 | 93.5 | 100.5 | 6760 | 12400 | - | 0.12 |
| RA10008C | 100 | 116 | 8 | 0.5 | 103.5 | 110.5 | 7150 | 13900 | - | 0.14 |
| BNAT105 | 10 | 21 | 5 | 0.2 | 12.5 | 18.5 | 1100 | 800 | - | 0.009 |
| BNAT205 | 20 | 31 | 5 | 0.2 | 22.5 | 28.5 | 1500 | 1400 | - | 0.015 |
| BNAT305 | 30 | 41 | 5 | 0.2 | 32.5 | 38.5 | 1900 | 2100 | - | 0.021 |
| BNAT408 | 40 | 56 | 8 | 0.2 | 42.5 | 53.5 | 4200 | 5800 | - | 0.027 |
| BNAT505 | 50 | 61 | 5 | 0.2 | 52.5 | 58.5 | 2400 | 3400 | - | 0.032 |
| BNAT555 | 55 | 66 | 5 | 0.2 | 57.5 | 63.5 | 2500 | 3700 | - | 0.035 |
| BNAT805 | 80 | 91 | 5 | 0.2 | 82.5 | 88.5 | 3000 | 5400 | - | 0.05 |
| BNAT905 | 90 | 101 | 5 | 0.2 | 92.5 | 98.5 | 3100 | 6000 | - | 0.056 |
If you need more detailed information , feel free to ask!
