Overview
B103 132.87:1 bevel gearbox with a 50mm hollow bore output and 90B5 IEC motor input for compact 90° right-angle drive integration.
Engineered for continuous-duty industrial service, it provides smooth power transmission, stable output speed control, and dependable torque delivery in demanding environments.
Very high reduction: With very high reduction at 132.87:1 you achieve maximum torque and ultra-low output speed for demanding duty such as heavy conveyors, rotary valves, and high-inertia applications requiring stable motion.
Need the non-standard 45mm bore option?
If your application requires a 45mm output bore instead of the standard 50mm, we can supply this as a non-standard configuration. View available B103 options and request the 45mm version here: Motovario B103 Gearbox.
Key Specifications
- Series: B Series – Bevel Helical Gearboxes
- Model: B103
- Reduction Ratio: 132.87:1
- Output Bore: 50mm Hollow Bore
- Motor Input: 90B5 IEC Flange
- Housing Material: High-strength cast iron
- Gear Type: Spiral bevel + hardened helical stage
- Mounting Positions: B3 Horizontal Mount
- Duty Rating: Suitable for continuous industrial operation (S1)
Designed to IEC mounting and interface standards, ensuring straightforward integration with IEC frame motors and reliable operation in VFD-controlled drive systems.
Output Speed (4-Pole vs 2-Pole Motors)
Calculated nominal output speed using a standard IEC motor:
| Motor Type | Input Speed (rpm) | Estimated Output Speed (rpm) |
|---|---|---|
| 4-Pole | 1400 | ~11 rpm |
| 2-Pole | 2800 | ~21 rpm |
Need torque confirmation? Output torque depends on motor power (kW), gearbox efficiency, and service factor. Use our Gearbox Service Factor Calculator or contact us for verified torque figures.
Motor Input Chart (IEC Flange Details)
This gearbox is supplied with a 90B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 90B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø200 × 24 |
If you’re unsure whether your motor is B5 or B14, contact our technical team for compatibility confirmation.
Internal Links & Compatible Options
Same ratio, different motor input: jump to the B103 132.87:1 variant you need (50mm bore).
Need a different ratio? Explore the closest B103 50mm bore ratios above and below this version.
More B103 options: Browse all Motovario B103 gearbox ratios
Explore the full B Series range: Motovario B Series bevel gearboxes
Helpful calculators:
Gearbox Ratio & Speed Calculator |
Output Torque Calculator
Performance & Design Features
✔ Space-saving 90° bevel layout for compact machine designs
✔ Strong torque multiplication with stable, controlled output speeds
✔ Precision-machined spiral bevel gearing for smooth, low-noise power transfer
✔ Heavy-duty taper roller bearings for high radial and axial load handling
✔ Well suited to inverter (VFD) driven motors and variable-speed control
✔ Rigid cast iron housing built for OEM and continuous-duty operation
Ratio Selection Tips
- Best for: ultra-low speed, high-torque duties — suited to heavy conveyors, dosing systems, and high-inertia applications where control and stability matter more than speed.
- Selection tip: ultra‑low speed drives need careful checks — confirm holding torque, braking/overrun control, and any backdriving requirements of the application.
FAQ
Is a very high ratio suitable for heavy conveyors?
Yes — very high ratios are commonly used where maximum pulling power and stable, low-speed motion are required.
Do I need to worry about stopping/overrun?
Yes — with high inertia loads, consider braking (mechanical brake or VFD braking) and confirm holding/overrun requirements to keep motion controlled.
Configuration Notes
- Input flange note: the 90B5 flange option supports larger IEC motors where extra input torque capacity is required without changing the right‑angle installation layout.
- Output bore note: with a 50mm bore, this gearbox suits many standard shafting setups, providing a robust interface for continuous-duty power transfer.
- Application example: bulk handling drive where controlled start/stop and high pulling power are critical.
Typical Applications
- Conveyor and line-shaft drive systems
- Automated production and assembly lines
- Food and beverage processing machinery
- Materials handling and logistics equipment
- Pumps, mixers, and agitator drives
- OEM machine and equipment builds
Need help selecting the correct ratio, bore size, or motor input?
Contact our gearbox specialists for sizing assistance, torque verification, and availability confirmation.
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