FM-20 flexible ball bearings
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FM-20 flexible ball bearings
Metric Dimensions (mm)
| Bore d | 35.56 | mm | Bearing inner bore |
| Outer Dia. D | 49.073 | mm | Bearing outer diameter |
| Width B | 8.13 | mm | Bearing width |
Structural Dimensions (mm)
| C‑outer | 7.24 | mm | Outer ring width |
| Ball Diameter | 4 | mm | Rolling element ball diameter |
| Ball Quantity | 33 | Pc. | Quantity of rolling elements |
| Max Radial Deformation | 0.3 | mm | Maximum radial deformation |
Radial Load (KN)
| Dynamic Load Cr | 12.63 | KN | Basic dynamic radial load rating |
| Static Load C0r | 12 | KN | Basic static radial load rating |
Speed & Torque
| Input Speed | 3000 | rpm | Input rotational speed |
| Output Torque | 45 | N·m | Output torque |
FM‑20 FM‑series flange flexible ball bearing is medium‑spec harmonic‑drive special‑bearing with pre‑integrated mounting‑flange. While realizing periodic elastic‑elliptical‑deformation and bearing alternating‑stress, it supports direct bolt‑fastening. Widely deployed for medium‑size robot joints and integrated‑structure harmonic‑automation equipment.
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.
