3E904KAT2 flexible ball bearings
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📐 Structure Drawing
3E904KAT2 flexible ball bearings
Metric Dimensions (mm)
| Bore d | 18.8 | mm | Bearing inner bore |
| Outer Dia. D | 25 | mm | Bearing outer diameter |
| Width B | 4 | mm | Bearing width |
Structural Dimensions (mm)
| C‑outer | 4 | mm | Outer ring width |
| Ball Diameter | 2.381 | mm | Rolling element ball diameter |
| Ball Quantity | 21 | Pc. | Quantity of rolling elements |
| Max Radial Deformation | 0.2 | mm | Maximum radial deformation |
Radial Load (KN)
| Dynamic Load Cr | 3.75 | KN | Basic dynamic radial load rating |
| Static Load C0r | 3.12 | KN | Basic static radial load rating |
Speed & Torque
| Input Speed | 3000 | rpm | Input rotational speed |
| Output Torque | 2 | N·m | Output torque |
3E904KAT2 flexible ball bearing belongs to classic 3E‑series harmonic‑drive special‑bearing fitted with KAT2 custom nylon‑cage. Ultra‑thin steel‑ring completes periodic elliptical‑elastic‑deformation under cam‑drive and resists complex alternating‑stress. High‑precision grade guarantees stable‑performance for miniature harmonic‑reducers and tiny robot‑joint assemblies.
Flexible ball bearings feature thin-walled flexible rings that undergo controlled elastic deformation during operation, enabling precise motion transmission through wave generator assemblies. Available in standard, ultra-thin, and high-fatigue designs, with bore diameters ranging from 20mm to 300mm. These bearings deliver high torsional stiffness, zero backlash, and exceptional positional accuracy, making them ideal for harmonic drive reducers, robotics joints, aerospace actuators, and precision positioning systems.
