Motovario BA72 40.87:1 Bevel Gearbox – 35mm Bore, 90B5

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: At 40.87:1, this high-reduction setup brings output speed down decisively while giving a clear step up in available torque for controlled, lower-speed drive duties.

It is a practical fit for conveyors, packaging lines, indexing systems, and process machinery that benefit from stronger reduction without moving fully into ultra-slow output speeds.

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.

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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.

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Key Specifications

Regulations: No
Bevel Helical: PAM B
Size: A72
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 40.87:1
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.

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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	~34 rpm
2-Pole	2800	~69 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 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.

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Internal Links & Compatible Options

Same ratio, different motor input: jump to the BA72 40.87:1 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

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Ratio Selection Tips

Best for: heavier conveyors, process machinery, and industrial handling systems where slower shaft speed and stronger torque are needed.

Selection tip: choose 40.87:1 when medium ratios still feel too quick and the application needs a clearer step up in torque multiplication.

FAQ

Will this ratio be too slow for my application?
40.87:1 is firmly in the high reduction group, so it is intended for applications that benefit from slower shaft speed and stronger torque rather than fast output.

Can I run this with a VFD?
Yes — this ratio works well with a VFD where you need adjustable process speed, smoother startup, and more control under load.

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

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