Overview
B103 33.07:1 bevel helical gearbox with a 50mm hollow bore output and 80B5 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.
High reduction: This high reduction ratio prioritises torque multiplication and controlled output speed, suited to heavier conveyors, process machinery, and positioning applications.
With its compact 80B5 flange input, this setup suits space-conscious installations using IEC frame motors, while still delivering industrial-grade power density and durability.
As part of the modular Motovario B103 bevel helical gearbox range, this unit supports flexible mounting positions, straightforward IEC motor compatibility, and proven long-term reliability for industrial service.
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: 33.07:1
- Output Bore: 50mm Hollow Bore
- Motor Input: 80B5 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)
Manufactured to IEC dimensional standards for seamless compatibility with IEC frame motors and inverter-driven (VFD) applications.
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 | ~42 rpm |
| 2-Pole | 2800 | ~85 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 80B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 80B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø200 × 19 |
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 33.07:1 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: mixed-load machinery that needs dependable torque at a controlled speed — ideal for conveyors, process equipment, and continuous-duty handling systems.
- Selection tip: mid ratios are the safest all‑rounder choice — confirm shaft torque and choose service factor for start/stop cycles and shock loading.
FAQ
Is this a good general-purpose ratio?
Yes — mid reduction ratios are typically the best balance for many machines, providing controlled speed with useful torque multiplication.
How do I choose between two close ratios?
Pick the ratio that keeps your target output speed closest at the motor speed you’ll actually run (direct-on-line or via VFD), then confirm required torque and service factor.
Configuration Notes
- Input flange note: with an 80B5 motor flange, this setup suits many general‑purpose machines that need a robust input without stepping up to larger frame sizes.
- Output bore note: the 50mm hollow shaft bore is a common industrial size for conveyors and handling equipment, offering a strong shaft interface for torque transmission.
- Application example: Example use: production conveyor moving mixed loads where consistent speed control and torque reserve are both important.
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.
Mid reduction (balanced speed & torque): The 33.07:1 reduction ratio delivers increased torque multiplication with controlled output speeds, making it well suited to processing equipment, bottling lines, and continuous-duty drives. supporting stable performance where moderate speed reduction is needed.
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