Overview
Configured around a compact 80B14 IEC flange input, this BA72 bevel helical gearbox is a strong choice for right-angle drives where installation space is tight and a standard 35mm hollow bore output is needed.
Reduction profile: The 27.45:1 ratio is chosen when a standard medium reduction still feels too fast, giving a stronger slowdown and more pronounced torque multiplication for production and handling equipment.
The compact B14 flange arrangement is often preferred where motor projection needs to be kept short, so this build works well in OEM machinery, retrofit assemblies, and tighter side-mounted installations.
In service, the BA72 arrangement is valued for efficient right-angle transmission, stable output behaviour, and the kind of durability expected in continuous-duty industrial environments.
Need the non-standard 30mm bore option?
If your application requires the non-standard 30mm output bore instead of this standard 35mm version, we can supply that configuration as well. View available BA72 options and request the non-standard bore 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): 27.45:1
Input Dim: Ø120×19 (IEC 80 B14)
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 | ~51 rpm |
| 2-Pole | 2800 | ~102 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 80B14 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 80B14 | IEC 60072 / IEC 60034 (B14 flange) | Ø120 × 19 |
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 27.45:1 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: loaded conveyors, process handling equipment, and automation systems that need stronger torque with controlled output speed.
Selection tip: pick 27.45:1 when you want a clear step up in torque multiplication from the lower medium ratios without moving fully into the slower high-ratio end of the range.
FAQ
Will this ratio be too fast for my application?
This ratio is no longer in the quick-output category. It suits equipment that benefits from steadier motion and stronger torque, though it is still faster than the higher BA72 ratios used for slower duty.
Can I run this with a VFD?
Yes — using a VFD with 27.45:1 gives good flexibility for startup, process control, and trimming conveyor speed without sacrificing the stronger torque advantage of this ratio.
Configuration Notes
- Input flange note: the 80B14 motor input gives a compact flange arrangement for smaller IEC motors where installation length matters.
- Output bore note: this build uses the standard 35mm bore. A 30mm BA72 bore is available as a non-standard option if a smaller shaft size is required.
- Application example: compact conveyors, transfer equipment, and OEM machinery where a short B14 motor arrangement is preferred.
Typical Applications
- Suitable for production lines, processing equipment, automated handling systems, and general industrial machinery.
- Packaging and process handling equipment
- Automated production and assembly lines
- Light materials handling equipment
- Rotary equipment and general machinery drives
- OEM machine and equipment builds
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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