Overview
Motovario B153 12.64:1 bevel gearbox with a 90mm hollow bore output and 225B5 IEC motor input, built for efficient 90° right-angle drive integration in larger industrial power transmission assemblies.
Designed for reliable long-term service, it provides consistent speed reduction and dependable torque transfer for OEM machinery, processing equipment, and continuous-duty plant installations.
Low Reduction: A strong choice for applications that need relatively fast output speed together with practical torque multiplication, making it well suited to conveyors, packaging systems, transfer equipment, and light-to-medium duty automation lines.
This version combines a 90mm hollow output bore with a 225B5 IEC motor input, giving a heavy-duty input-side configuration for larger motor pairings where secure shaft engagement and steady power transmission are essential.
With its 225B5 flange input, this configuration is intended for larger IEC motor frames, offering increased motor compatibility and greater input-side capacity while preserving a compact right-angle installation format and dependable industrial performance.
As part of the modular Motovario B Series bevel helical gearbox range, this unit supports flexible mounting arrangements, straightforward IEC motor adaptation, and proven long-term operation in demanding industrial environments.
Key Specifications
Regulations: No
Bevel Helical: PAM B
Size: 153
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 12.64
Input Dim: Ø450 x 60 (IEC225 B5)
Output Shaft Dim: Ø90
Rotation Direction: Standard
ON-Oil Plugs: Breather-Drain-Level (Standard)
Mounting Position: B3
ON-Output Oil Seal: NBR-Nitrile
ON-Input Oil Seal: NBR-Nitrile
ON-Output Bearings: Taper Roller Bearings
ON-Lubrication: Without Oil
Paint: RAL 5010 Blue
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 | ~111 rpm |
| 2-Pole | 2800 | ~222 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 225B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 225B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø450 x 60 |
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 B153 12.64:1 variant you need with a 90mm bore.
Need a different ratio? Explore the closest B153 90mm bore ratios to this version.
More B153 options: Browse all Motovario B153 gearbox ratios
Explore the full B Series range: Motovario B Series bevel gearboxes
Helpful calculators: Gearbox Ratio & Speed Calculator | Output Torque Calculator
Need the non-standard 80mm bore option?
If your application requires a 80mm output bore instead of the standard 90mm, we can supply this as a non-standard configuration. View available B103 options and request the 80mm version here: Motovario B153 Gearbox.
Ratio Selection Tips
Best for: right-angle drive applications that need quicker output speed without losing useful torque support, including automated conveyors, packaging lines, transfer units, and general materials handling equipment.
Selection tip: a 12.64:1 ratio is well suited to machinery where maintaining output speed is important but some torque increase is still required for reliable load movement. It is a good fit for continuously operating equipment where smooth transmission, compact installation, and stable running are priorities. Always confirm inertia, start-up loading, and operating hours before final selection.
FAQ
Is 12.64:1 better for speed or torque?
This ratio is generally chosen when you want to keep output speed relatively high while still gaining useful torque multiplication. If your application is slow-running or requires maximum reduction, a higher ratio would usually be more suitable.
Can I use this gearbox with an inverter-duty motor?
Yes — it can be used with a VFD or inverter-duty motor to provide more accurate speed control and smoother machine performance. For extended operation at low motor speeds, check that motor cooling and sizing are suitable for the application.
Configuration Notes
Input flange note: the 225B5 IEC input is intended for larger motor frames, making this version suitable for installations that need increased motor capacity and stronger input-side drive support.
Output bore note: the 90mm hollow bore suits larger driven shafts, providing a secure and stable mechanical connection for dependable torque transmission in industrial assemblies.
Application example: suitable for automated conveyor sections, packaging transfer systems, or materials handling equipment where a compact right-angle drive, larger motor compatibility, and relatively fast output speed are required.
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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