Overview
Motovario BA72 8.36:1 bevel gearbox with a 35mm hollow bore output and 90B5 IEC motor input, built for dependable 90° right-angle transmission in conveyor systems, line machinery, and OEM assemblies.
Low reduction ratio: The 8.36:1 ratio gives a useful balance of higher output speed and practical torque multiplication, making it a good fit for continuous-duty machinery that still needs responsive shaft speed.
This arrangement uses a robust 90B5 direct motor interface together with a 35mm hollow output bore, providing a practical solution when the non-non-standard 30mm BA72 bore is preferred but you want the simplicity of B5 flange mounting.
Designed for long-term industrial use, the BA72 delivers smooth mechanical efficiency, stable output behaviour, and reliable service across demanding operating conditions.
Need the non-standard 30mm bore option?
If your application requires the standard 30mm output bore instead of this 30mm non-standard version, we can supply that configuration as well. View available BA72 options and request the 30mm version here: Motovario BA72 Gearbox.
Key Specifications
Regulations: No
Bevel Helical: PAM B
Size: A72
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 8.36:1
Input Dim: Ø200×24 (IEC 90 B5)
Output Shaft Dim: Ø35
Rotation Direction: Standard
ON-Oil Plugs: No Plugs (Standard)
Mounting Position: U
ON-Output Oil Seal: NBR-Nitrile
ON-Input Oil Seal: NBR-Nitrile
ON-Output Bearings: Ball Bearings
ON-Lubrication: Mineral SAE 85W-140
Paint: Ral 5010 Blue
Designed to IEC mounting and interface standards, this gearbox offers straightforward compatibility with IEC frame motors and dependable performance in direct-on-line or VFD-controlled drive systems.
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 | ~167 rpm |
| 2-Pole | 2800 | ~335 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 × 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 BA72 8.36:1 variant you need (35mm bore).
Need a different ratio? Explore the closest BA72 35mm ratios around this version.
More BA72 options: Browse all Motovario BA72 gearbox ratios
Explore the full BA Series range: Motovario BA Series bevel gearboxes
Helpful calculators:
Gearbox Ratio & Speed Calculator |
Output Torque Calculator
Ratio Selection Tips
Best for: general conveying, line-shaft drives, and plant machinery where you want higher shaft speed with a direct B5 motor interface.
Selection tip: this version makes sense when you need a little more motor-side mounting robustness than B14, while still keeping the faster output characteristics of a lower reduction ratio.
FAQ
Will this ratio be too fast for my application?
That depends on the driven equipment. This ratio is aimed at applications needing comparatively quick output speed, so for slower mixers, heavy handling, or high-torque duties you would normally move to a higher reduction.
Can I run this with a VFD?
Yes — a VFD can be used to fine-tune output speed and improve startup control with this configuration. Check the motor’s cooling arrangement if operation at low speed will be frequent or continuous.
Configuration Notes
- Input flange note: the 90B5 motor input offers direct flange mounting for IEC 90 frame motors and is well suited to tidy, rigid installations.
- Output bore note: with the standard 35mm bore, this gearbox suits the normal BA72 shaft arrangement, while a 30mm version is available as a non-standard option.
- Application example: conveyor drives, production line auxiliaries, and general plant machinery where dependable B5 motor coupling and relatively fast output speed are needed.
Typical Applications
- General conveyor drive systems
- Production and process line auxiliaries
- Line-shaft and transfer equipment
- Packaging and handling machines
- Light industrial processing systems
- OEM machinery and replacement installations
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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