Overview
Motovario BA72 8.36:1 bevel gearbox with a 35mm hollow bore output and 100-112B5 IEC motor input, configured for right-angle industrial drive systems that require a larger direct-mount motor arrangement.
Low reduction ratio: The 8.36:1 reduction keeps output speed comparatively high while still multiplying torque, which makes this version well suited to larger conveying systems, process lines, and OEM machinery needing responsive power transmission.
Its combination of a 100-112B5 motor interface and 35mm hollow output bore provides a practical answer where the non-non-standard 30mm BA72 bore is preferred and a direct B5 motor mounting format is preferred.
The BA72’s bevel helical design supports smooth running, stable output behaviour, and dependable service life in continuous industrial operation.
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: Ø250×28 (IEC 100-112 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 100-112B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 100-112B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø250 × 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 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: larger conveyors, process plant auxiliaries, and OEM machinery where direct B5 motor mounting and faster output speed are both required.
Selection tip: use this version when you need the larger 100-112 B5 input format, a non-standard 35mm output bore, and one of the quicker BA72 ratios for higher shaft speed duties.
FAQ
Will this ratio be too fast for my application?
This variant is designed for applications where relatively quick output speed is an advantage. If your machine needs slower shaft rotation, heavier pulling force, or greater reduction, stepping up to a higher BA72 ratio would make more sense.
Can I run this with a VFD?
Yes — it can be used with a VFD for variable-speed operation and process tuning. Make sure the chosen motor is suitable for inverter duty where required, and monitor cooling at low operating speeds.
Configuration Notes
- Input flange note: the 100-112B5 motor input allows direct flange mounting for larger IEC motors where a more substantial B5 interface is preferred.
- Output bore note: this build uses the standard 35mm bore, while a 30mm BA72 configuration is available as a non-standard option.
- Application example: main conveyor drives, process machinery, and OEM equipment where a larger direct-mount motor needs to be paired with a relatively fast right-angle gearbox ratio.
Typical Applications
- Main conveyor and transfer drives
- Process plant auxiliary machinery
- Larger packaging and handling systems
- Production line drive modules
- OEM industrial machine assemblies
- Retrofit installations needing larger direct-mount motors
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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