SITI MI80 80:1 Worm Gearbox – 35mm Hollow Bore

This SITI MI80 80:1 worm gearbox is a compact right-angle speed reducer designed for applications requiring lower output speed, increased torque multiplication, and more controlled drive output. With a 35mm hollow bore output and 80B5, 80B14, 90B5 & 90B14 IEC motor input options, it is a practical choice for OEM and replacement duties where smooth running, compact installation, and dependable industrial service are important.

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Gearbox Overview

This larger MI size is commonly chosen where more torque capacity is needed without moving into very heavy gearbox constructions. The 80:1 ratio is aimed at applications needing slower output speed and stronger torque multiplication.

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Why Choose This Configuration?

A 80:1 worm gearbox is normally chosen where slower shaft speed, increased torque multiplication, and smooth controlled motion are more important than maximum output speed. In practical terms, this configuration is well suited to mixers, screw drives, indexing systems, and machinery where slower output speed and stronger torque multiplication are needed, while still keeping the compact MI-series format and flexible IEC motor input compatibility.

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Technical Details

Gearbox size: MI80
Gear ratio: 80:1
Output type: Hollow bore
Output bore: 35mm
Motor input options: 80B5, 80B14, 90B5 & 90B14
Input mounting: IEC motor input options as listed on the product page
Lubrication: Pre-lubricated with synthetic oil ISO VG 320 PAG
Operating temperature: -10°C to +30°C with synthetic oil
Mounting position: Must match the ordered mounting position / installation arrangement
Construction: Industrial right-angle worm gearbox
Approximate gearbox weight: 17.5kg

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Internal Links & Compatible Options

Same gearbox size, different ratios: compare nearby reduction options for the SITI MI80.

Same ratio, different gearbox sizes: explore nearby sizes offering a 80:1 ratio.

More SITI gearboxes: Browse all SITI gearboxes Browse all worm gearboxes

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

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Frequently Asked Questions

What does a 80:1 worm gearbox do?

A 80:1 worm gearbox reduces the input speed by a factor of 80, increasing torque output while lowering shaft speed for smoother and more controlled drive performance.

What is this SITI MI80 gearbox commonly used for?

This gearbox is commonly used on conveyors, packaging machines, automation systems, feeders, small processing equipment, and general industrial machinery where a compact right-angle drive is required.

Is this gearbox pre-lubricated?

Yes. SITI MI gearboxes are supplied pre-lubricated with synthetic ISO VG 320 PAG oil for standard service conditions.

Can this gearbox be used in different mounting positions?

SITI gearboxes can be supplied for different mounting positions, but the unit should be installed in the ordered mounting arrangement so lubrication remains correct.

What should I check before replacing a SITI MI80 gearbox?

Check the gearbox size, ratio, output bore size, motor input option, and mounting arrangement before ordering a replacement unit.

What is the output bore on this gearbox?

This version is supplied with a 35mm hollow bore output.