Overview
Motovario B163 12.81:1 bevel gearbox with a 100mm hollow bore output and 280B5 IEC motor input, developed for demanding right-angle drive duties where high input capacity, dependable torque transmission, and robust industrial performance are essential.
Suited to heavy-duty OEM machinery, plant equipment, and continuous-process systems, this configuration delivers stable speed reduction, smooth mechanical operation, and reliable long-term service in challenging industrial environments.
Low Reduction: An 12.81:1 ratio is ideal for applications that need to keep output speed relatively high while still benefiting from practical torque increase, making it a strong solution for conveyors, transfer systems, packaging machinery, and material handling lines.
The 100mm hollow bore output is intended for larger driven shafts, helping provide secure shaft engagement and dependable torque transfer in heavier-load installations.
Paired with a 280B5 IEC motor input, this version is designed for larger flange-mounted motor combinations, giving increased input-side capacity and making it suitable for more demanding drive packages within the modular Motovario B Series bevel helical gearbox range.
Key Specifications
Regulations: No
Bevel Helical: PAM B
Size: 163
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 12.81
Input Dim: Ø550 x 75 (IEC280 B5)
Output Shaft Dim: Ø100
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 | ~109 rpm |
| 2-Pole | 2800 | ~219 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 280B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 280B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø550 x 75 |
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 B163 12.81:1 variant you need with a 100mm bore.
Need a different ratio? Explore the closest B163 100mm bore ratios to this version.
More B163 options: Browse all Motovario B163 gearbox ratios
Explore the full B Series range: Motovario B Series bevel gearboxes
Helpful calculators: Gearbox Ratio & Speed Calculator | Output Torque Calculator
FAQ
What type of machinery is an 12.81:1 ratio best suited to?
This ratio is a strong choice for machinery that needs useful speed reduction without dropping output speed too far. It works particularly well on conveyors, transfer equipment, packaging lines, and handling systems where efficient throughput and dependable torque transmission are both important.
Is the 280B5 input intended for higher-power motor setups?
Yes — the 280B5 IEC input is designed for larger flange-mounted motor pairings, making this configuration well suited to heavier-duty applications where greater input capacity and stronger motor compatibility are required.
Configuration Notes
Input flange note: the 280B5 IEC input supports larger industrial motor frames, making this gearbox suitable for high-capacity drive assemblies that need a secure and dependable flange-mounted motor connection.
Output bore note: the 100mm hollow bore is designed for larger driven shafts, helping provide stable shaft retention and reliable torque transmission in demanding industrial installations.
Application example: ideal for bulk conveyors, transfer lines, process equipment, and larger packaging machinery where a compact right-angle gearbox, high motor input capacity, 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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