Rossi MVR100 UO3A 40:1 Worm Gearbox – 48mm Output Bore, Cast Iron Housing

This Rossi MVR100 UO3A 40:1 worm gearbox is a larger Rossi worm gearbox size built for higher torque duties designed for applications needing slower output speed with stronger torque multiplication. With a 47kg gearbox weight, Rossi industrial build quality, and a 48mm hollow output bore, it suits heavier conveyors, screw feeds, agitators, lifting-related drives, and machinery requiring stronger low-speed torque delivery.

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Gearbox Overview

The MVR100 casing is a monolithic cast iron design with feet integral with the casing on two 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 higher ratio is commonly used where lower output speed, improved control, and increased torque multiplication are more important than outright shaft speed.

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Why Choose This Configuration?

This exact version is best suited to buyers who specifically need a Rossi MVR100 UO3A 40:1 gearbox with a 48mm 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: MVR100
Design code: UO3A
Gear ratio: 40:1
Output bore: 48mm hollow bore
Housing material: Cast iron monolithic casing
Worm wheel material: Ni bronze gear rim
Mounting arrangement: Universal mounting with feet on 2 faces with B14 on 2 faces
Motor compatibility: IEC motor mounting system
Lubrication: Synthetic oil bath, long-life lubrication
Oil supply note: synthetic oil bath design; larger sizes are specified with filler, drain and level plug arrangements
Finish: Blue RAL 5010
Approximate gearbox weight: 47kg

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Internal Links & Compatible Options

Same gearbox size, different ratios: explore the closest ratios for the Rossi MVR100 range.

Same ratio, different gearbox sizes: explore nearby sizes offering a 40:1 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 40:1 worm gearbox do?

A 40:1 worm gearbox reduces input speed by a factor of 40, increasing torque while lowering output shaft speed for smoother controlled drive performance.

What is this Rossi MVR100 gearbox commonly used for?

This gearbox is commonly used on conveyors, mixers, feeders, pumps, and general industrial machinery needing applications needing lower output speed and stronger output torque.

What output bore does this gearbox have?

This version has a 48mm 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.