Overview
B143 166.53:1 bevel helical gearbox with a 70mm hollow bore output and 180B5 IEC motor input for compact 90° right-angle drive integration.
Designed to handle demanding loads, it combines efficient gearing with robust construction for reliable 90° transmission in compact machine layouts.
Very high reduction: A 166.53:1 very high reduction ratio is designed for low-speed, high-torque work where control and holding capability are critical.
This configuration includes a 70mm hollow output bore and a 180B5, providing dependable speed reduction and consistent torque delivery for conveyors, automation lines, packaging machinery, and OEM equipment builds.
With its larger 180B5 flange input, this version is intended for bigger IEC frame motors, offering higher input capacity and wider motor compatibility while maintaining a compact 90° installation footprint and proven heavy-duty reliability.
As part of the modular Motovario B143 bevel helical gearbox range, this unit supports multiple mounting orientations, straightforward IEC motor fitment, and dependable long-term performance for continuous industrial service.
Need the non standard 65mm bore option?
If you need an output bore other than the standard 70mm, alternative configurations may be available subject to supply. View the B143 range and request your required bore option here: Motovario B143 Gearbox.
Key Specifications
- Series: B Series – Bevel Helical Gearboxes
- Model: B143
- Reduction Ratio: 166.53:1
- Output Bore: 70mm 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)
Manufactured with hardened, precision-ground gear geometry to improve efficiency and help minimise 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 | ~8 rpm |
| 2-Pole | 2800 | ~17 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 and we’ll confirm compatibility.
Internal Links & Compatible Options
Same ratio, different motor input: jump to the B143 166.53:1 variant you need (70mm bore).
Need a different ratio? Explore the closest B143 70mm bore ratios above and below this version.
More B143 options: Browse all Motovario B143 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
✔ Efficient 90° transmission in a compact bevel-helical package
✔ Quiet running and stable output thanks to precision gear cutting
✔ Designed to handle continuous-duty operation (S1) in industrial environments
✔ High load-bearing capability for demanding shaft loading conditions
✔ Ideal for variable-speed operation with VFDs where specified
✔ Durable cast iron construction for OEM and heavy-use applications
Ratio Selection Tips
- Best for: very low-speed, high-torque duties — ideal for lifting, positioning, indexing under load, and slow process machinery.
- Selection tip: very high ratios suit slow-speed loads; confirm motor cooling (especially with a VFD) and ensure service factor covers duty and shock loads.
FAQ
Is this ratio too slow for conveyors?
Very high ratios are generally for slow-speed, high-torque duties. If you need higher line speed, select a low/mid reduction ratio instead.
Can I run this with a VFD?
Yes — a VFD is ideal for accurate speed control. For long periods at very low motor speeds, ensure adequate motor cooling if running at reduced frequency.
Configuration Notes
- Input flange note: the 180B5 IEC input suits larger IEC motors, increasing input capacity and expanding motor compatibility for heavier-duty applications.
- Output bore note: the 70mm hollow bore supports larger shaft interfaces and higher loading, providing a rigid, secure connection for torque transmission.
- Application example: heavy positioning table where low output speed and high torque are required
Typical Applications
- Precision slow-speed positioning systems under load
- Rotary tables and indexing for heavy assemblies
- Slow conveyor or process drives requiring very low output rpm
- Lift/hold applications (confirm braking/holding requirements)
- High-inertia machinery needing maximum mechanical advantage
- Robust industrial duty where torque capacity is critical
Need help selecting the correct ratio, bore size, or motor input?
Contact our gearbox specialists for sizing support, torque checks, and availability confirmation.
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