Overview
With a 90B5 input flange and standard 35mm hollow bore, this BA72 configuration is set up for dependable right-angle speed reduction in machinery that uses common IEC motor mountings.
Reduction profile: The 54.94:1 ratio is suited to applications that need a noticeably slower output shaft together with higher torque gain for heavier handling, process, or conveyor duties.
This suits process handling equipment, slower conveyor sections, mixers, feeders, and general OEM machinery where extra reduction helps stabilise the driven system.
The 90B5 input gives a familiar motor interface for many plant and OEM installations, making integration easier where this frame size is already standardised.
In use, the BA72 platform offers robust geared transmission, consistent output behaviour, and the durability needed for regular industrial operation.
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): 54.94:1
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 | ~25 rpm |
| 2-Pole | 2800 | ~51 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 54.94:1 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: slow-speed conveyors, process lines, and equipment that benefits from stronger torque and more controlled output speed.
Selection tip: pick 54.94:1 when the application needs a substantial reduction in shaft speed while remaining within the main BA72 high-ratio range.
FAQ
Will this ratio be too slow for my application?
54.94:1 is a slower high reduction option, so it is well suited to applications that need controlled output speed and stronger mechanical advantage.
Can I run this with a VFD?
Yes — a VFD can be used with 54.94:1 to fine-tune process speed while keeping the strong torque characteristics of the gearbox.
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: 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: general conveyor drives, line machinery, and plant equipment where direct B5 motor mounting is preferred.
Typical Applications
- Conveyor and transfer drive systems
- 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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