Overview
B123 25.89:1 bevel helical gearbox with a 60mm hollow bore output and 180B5 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.
Mid reduction: A mid reduction 25.89:1 ratio provides controlled output speed with meaningful torque multiplication, ideal for production conveyors, process equipment, and mixed-load applications.
This configuration includes a 60mm hollow output bore and a 180B5 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: 25.89:1
- Output Bore: 60mm Hollow Bore
- Motor Input: 180B5 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)
Heavy-duty sealing and housing rigidity help protect internal gearing from contamination in harsh industrial environments.
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 | ~54 rpm |
| 2-Pole | 2800 | ~108 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 180B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 180B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø350 x 48 |
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 25.89:1 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
✔ 25.89:1 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: 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: the 180B5 IEC input is for very high-power installations, supporting large motors and high torque demand in continuous-duty service.
- 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: turntable or rotary indexing system needing controlled speed with dependable torque multiplication.
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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