Rossi MVR63 UO3A 25:1 Worm Gearbox – 32mm Output Bore, Cast Iron Housing

This Rossi MVR63 UO3A 25:1 worm gearbox is a versatile mid-range Rossi worm gearbox size designed for applications needing a balanced reduction between output speed and torque multiplication. With a 17kg gearbox weight, Rossi industrial build quality, and a 32mm hollow output bore, it suits conveyors, mixers, pumps, indexing equipment, and general machinery where dependable day-to-day drive performance is required.

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Gearbox Overview

The MVR63 casing is a monolithic cast iron design with feet integral with the casing on three faces plus B14 flange fixing on two faces. Rossi specifies a Ni bronze worm wheel, precision ground worm gearing, and long-life synthetic oil lubrication for dependable service. This ratio is commonly chosen for applications that need a practical middle ground between output speed reduction and torque increase without oversizing the drive.

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Why Choose This Configuration?

This exact version is best suited to buyers who specifically need a Rossi MVR63 UO3A 25:1 gearbox with a 32mm hollow bore. It is a strong replacement option where matching the gearbox size, bore, and ratio matters more than using a generic worm reducer. For users standardising around Rossi worm gearboxes, this keeps the same overall design logic, output geometry, and industrial-duty construction.

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Technical Details

Gearbox series: Rossi MVR worm gearbox
Gearbox size: MVR63
Design code: UO3A
Gear ratio: 25:1
Output bore: 32mm hollow bore
Housing material: Cast iron monolithic casing
Worm wheel material: Ni bronze gear rim
Mounting arrangement: Universal mounting with feet on 3 faces with B14 on 2 faces
Motor compatibility: IEC motor mounting system
Lubrication: Synthetic oil bath, long-life lubrication
Oil supply note: supplied complete with synthetic oil
Finish: Blue RAL 5010
Approximate gearbox weight: 17kg

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Internal Links & Compatible Options

Same gearbox size, different ratios: explore the closest ratios for the Rossi MVR63 range.

Same ratio, different gearbox sizes: explore nearby sizes offering a 25:1 ratio.

More Rossi gearboxes: Browse all Rossi worm gearboxes Browse all worm gearboxes

Helpful calculators:
Gearbox Ratio & Speed Calculator |
Output Torque Calculator

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Frequently Asked Questions

What does a 25:1 worm gearbox do?

A 25:1 worm gearbox reduces input speed by a factor of 25, increasing torque while lowering output shaft speed for smoother controlled drive performance.

What is this Rossi MVR63 gearbox commonly used for?

This gearbox is commonly used on conveyors, mixers, feeders, pumps, and general industrial machinery needing applications needing a practical balance between speed reduction and torque multiplication.

What output bore does this gearbox have?

This version has a 32mm hollow output bore, so the driven shaft size should be checked carefully before ordering.

What is the housing material?

Rossi specifies a cast iron monolithic casing for this series, designed for industrial-duty strength, rigidity, and oil capacity.

What lubricant is used in this gearbox?

Rossi specifies synthetic oil bath lubrication for long-life operation in this worm gearbox range.

Why is B3 mounting usually preferred?

B3 is generally the technically preferred orientation because it supports lower oil splash, good lubrication behaviour, and reduced heating in normal service.