Overview
B123 99.70:1 bevel helical gearbox with a 60mm hollow bore output and 90B5 IEC motor input for compact 90° right-angle drive integration.
Designed for industrial reliability, this build provides stable output speed control and robust torque delivery in demanding environments.
Very high reduction: This very high reduction ratio delivers maximum torque multiplication with very low output speed, ideal for heavy conveying, bulk handling, and high-inertia loads where stability and control matter more than speed.
This configuration includes a 60mm hollow output bore and a 90B5 IEC motor input, providing dependable speed reduction and confident torque delivery for conveyors, automation lines, packaging machinery, and OEM equipment builds.
With its robust 90B5 flange input, this setup suits widely used IEC frame motors, offering excellent motor compatibility and a compact right-angle footprint while maintaining industrial-grade power density and durability.
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: 99.70:1
- Output Bore: 60mm Hollow Bore
- Motor Input: 90B5 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)
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 | ~14 rpm |
| 2-Pole | 2800 | ~28 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 x 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 B123 99.7:1 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
✔ 99.70:1 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: maximum torque and very low output speed — ideal for heavy conveying, bulk handling, rotary valves, and high-inertia loads that demand stable, controlled motion.
- 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 IEC input is suited to higher-power motor pairings, improving input torque handling for continuous-duty industrial operation.
- Output bore note: with a 60mm bore, this configuration supports larger shafts and higher torque demand in continuous-duty service.
- Application example: rotary valve or dosing system where precise low-speed output and high torque prevent stalling under load.
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.
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