Overview
B123 69.43:1 bevel helical gearbox with a 60mm hollow bore output and 100-112B5 IEC motor input for compact 90° right-angle drive integration.
Built for long service life, this gearbox supports consistent performance for automation and materials handling duties.
High reduction: This high reduction ratio delivers significant torque multiplication with reduced output speeds, supporting high-load drive systems where maximum torque capacity and operational stability are essential.
This configuration includes a 60mm hollow output bore and a 100-112B5 IEC motor input, providing dependable speed reduction and confident torque delivery for conveyors, automation lines, packaging machinery, and OEM equipment builds.
As part of the modular Motovario B123 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 55mm bore option?
If your application requires a different output bore size than the standard 60mm, we can often supply alternative configurations depending on availability. View the B123 range and request your required bore option here: Motovario B123 Gearbox.
Key Specifications
- Series: B Series – Bevel Helical Gearboxes
- Model: B123
- Reduction Ratio: 69.43:1
- Output Bore: 60mm Hollow Bore
- Motor Input: 100-112B5 IEC Flange
- Housing Material: High-strength cast iron
- Gear Type: Spiral bevel + hardened helical stage
- Mounting Positions: B3 Mount
- Duty Rating: Suitable for continuous industrial operation (S1)
Designed with hardened, precision-ground gear geometry to maximise efficiency and reduce heat build-up under continuous load.
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 | ~20 rpm |
| 2-Pole | 2800 | ~40 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 100-112B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 100-112B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø250 x 28 |
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 B123 69.43:1 variant you need (60mm bore).
Need a different ratio? Explore the closest B123 60mm bore ratios above and below this version.
More B123 options: Browse all Motovario B123 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
✔ Compact 90° right-angle bevel design for space-saving gearbox installations
✔ 69.43:1 reduction delivers reliable torque boost with smooth, predictable output speeds
✔ Precision-cut spiral bevel gears for quiet running and efficient power transmission
✔ Heavy-duty bearing arrangement designed to manage high radial and axial shaft loads
✔ Excellent choice for VFD-driven motors and variable-speed process control
✔ Robust cast iron housing engineered for OEM machinery and continuous industrial service
Ratio Selection Tips
- Best for: torque-focused drives with reduced output speed — ideal for heavier conveyors, mixers, and load-handling equipment that must start and run smoothly under load.
- Selection tip: for torque-heavy duties, high reduction helps — verify duty cycle, heat dissipation, and whether backdriving resistance is required.
FAQ
Does a high ratio increase torque a lot?
Yes — high reduction significantly multiplies torque and reduces output speed, improving stability under load. Always confirm shaft torque and gearbox service factor.
Do I need braking or a soft start?
Often recommended for heavier loads. A VFD ramp or soft starter helps reduce shock loading during start/stop, and braking may be needed for controlled stopping.
Configuration Notes
- Input flange note: the 100–112B5 IEC input is designed for larger IEC motors, increasing torque capacity and widening motor compatibility for heavier duty applications.
- Output bore note: the 60mm hollow shaft bore suits larger shaft interfaces and heavier loading, providing a robust connection for high-torque transmission.
- Application example: loaded conveyor or agitator where reduced speed improves stability and higher torque handles heavier product flow.
Typical Applications
- Belt and chain conveyor drives (incl. incline conveyors)
- Line-shaft conveyor sections and transfer stations
- Packaging machinery (cartoners, case packers, pallet conveyors)
- Automated assembly and indexing tables
- Food-grade conveyor and processing line drives (washdown-area compatible when specified)
- Materials handling: roller conveyors, sortation lines, and accumulation systems
Need help selecting the correct ratio, bore size, or motor input?
Contact our gearbox specialists for sizing assistance, torque verification, and availability confirmation.
Reviews
There are no reviews yet.