Motovario B153 38.81:1 Bevel Gearbox – 90mm Bore, 160B5

Overview

Configured as a Motovario B153 38.81:1 bevel gearbox, this unit combines a 90mm hollow bore output with a 160B5 IEC motor input for compact right-angle industrial drive installations.

Engineered for continuous-duty operation, it provides reliable reduction performance and dependable torque transmission across plant, process, and OEM machinery.

High Reduction: Designed for slower shaft speeds and increased turning force, this configuration suits loaded conveyors, transfer systems, process machinery, and applications requiring controlled movement under load.

Combining a 90mm hollow bore output and 160B5 IEC motor interface, this version supports secure shaft mounting, dependable torque delivery, and stable operation across industrial conveying and handling systems.

Its 160B5 IEC flange input supports direct motor fitment for applications needing dependable alignment, straightforward installation, and a compact 90° gearbox arrangement.

Within the modular Motovario B Series, this gearbox benefits from flexible configuration options, dependable IEC motor compatibility, and proven suitability for long-term industrial service.

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Key Specifications

Regulations: No
Bevel Helical: PAM B
Size: 153
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 38.81
Input Dim: Ø350 x 42 (IEC160 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

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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	~36 rpm
2-Pole	2800	~72 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.

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Motor Input Chart (IEC Flange Details)

This gearbox is supplied with a 160B5 IEC motor input. Confirm flange compatibility below:

Motor Input	IEC Standard	Input Dimensions
160B5	IEC 60072 / IEC 60034 (B5 flange)	Ø350 x 42

If you’re unsure whether your motor is B5 or B14, contact our technical team and we’ll confirm compatibility.

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Internal Links & Compatible Options

Same ratio, different motor input: jump to the B153 38.81:1 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

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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.

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Ratio Selection Tips

Best for: applications where torque and controlled movement matter more than fast shaft speed, such as loaded conveyors, transfer equipment, process lines, and production machinery.

Selection tip: a 38.81:1 ratio works well where you need stronger turning force together with reduced output speed. It is particularly effective in machinery operating under heavier load or requiring more measured movement through the drive system.

FAQ

Will this ratio be too fast for my application?
This 38.81:1 ratio is better suited to duties where torque and controlled output are more important than higher shaft speed. For faster-running applications, consider a lower ratio.

Can I run this with a VFD?
Yes — this gearbox can be paired with a VFD for more precise speed control, smoother acceleration, and improved process flexibility. When operating at very low motor speeds for long periods, make sure cooling remains adequate, especially under constant load conditions.

Configuration Notes

Input flange note: the 160B5 IEC input allows compatibility with larger IEC motors, providing a stable and versatile mounting arrangement for industrial drive systems where dependable input-side performance is important.

Output bore note: the 90mm hollow bore is designed for larger driven shafts, helping provide secure torque transmission and stable mechanical connection in demanding applications.

Application example: ideal for loaded conveyors, transfer equipment, and production machinery where lower output speed and increased torque support stable continuous-duty performance.

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Need help selecting the correct ratio, bore size, or motor input?
Contact our gearbox specialists for sizing support, torque checks, and availability confirmation.