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Mini Gearboxes

A mini gearbox — also called a micro gearbox or gearhead — pairs a small-diameter, precision-machined gear train with a compact housing to cut speed and add torque inside a tight envelope.

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  • Mini Gearboxes

Types

Mini Gearbox Range by Type

Spur, planetary and worm mini gearboxes cover light loads, high torque density and right-angle self-locking output.

  • Spur Mini Gearboxes

    The simplest, most efficient reduction for light loads, with same-direction or reverse output depending on stage count.

    • Sizes: 10mm, 12mm, 13mm and 15mm
    • Ratios: 20–250, 3–1000 and 6–360
    • Output: Same-direction or reverse by stage count

  • Planetary Mini Gearboxes

    Coaxial, 1–4 stages, the highest torque density per diameter, with sizes from 10mm up to 45mm.

    • Sizes: 10mm, 12mm, 16mm, 20mm, 22mm, 28mm, 36mm, 42mm and 45mm
    • Ratios: Up to 509:1, 5–1080, 4–625, 3.7–721 and up to 515:1
    • Torque: 800–2,000 g·cm rated on 16mm

  • Worm Mini Gearboxes

    Right-angle output with self-locking hold, in 18mm and 24mm sizes.

    • Sizes: 18mm and 24mm
    • Ratios: 42–2025 and 26–1000
    • Torque: 300–400 g·cm and 200–500 g·cm rated
Comparison

Mini Gearbox Comparison

The table below compares our mini gearbox types by diameter, gear type, ratio behavior, torque character, backlash, and efficiency for quick engineering reference.

DiameterGear TypeRatio BehaviorTorque CharacterBacklashEfficiency
10mm spurSpur20:1–250:1, 3–5 stages, Φ10×8×6–9mm100–300 g·cm rated, 300–600 g·cm peakLowest per mesh, accumulates per stageHighest of the three types
13mm / 15mm spurSpur6:1–360:1, 2–4 stages, 13×12×11mm200–300 g·cm rated, 600–900 g·cm peakLowHigh
18mm wormWorm42:1–2025:1 with 4 stages, 18×12×10mm300–400 g·cm rated, 600–1,200 g·cm peak; self-locking outputRight-angle mesh — moderateLowest of the three, drops further as ratio climbs
16mm planetaryPlanetary4:1–1621:1, 1–4 stages, 16.35–31mm long800–2,000 g·cm rated, 2,400–6,000 g·cm peak — highest torque density per volumeCompounds with each added stage~80% (2 stages) to ~70% (3 stages)

Exact ratio, torque, and backlash figures are confirmed against your load and duty cycle once we review your drawing, so send your drawing for a ratio check and we'll match the mini gearbox to your application.

Spec

Spec Confirmation

Module, gear tolerance class, surface finish, minimum order quantity, and sample lead time are not fixed catalog values — gear geometry changes with your envelope.

Each of these is confirmed once we've reviewed your ratio, load, and shaft/housing requirements, keeping quotes accurate instead of promising a generic number that doesn't match your actual part.

  • Module: Confirmed after ratio and load review
  • Gear tolerance class: Set to your envelope, not catalog
  • Surface finish: Confirmed with your shaft and housing needs
  • Minimum order quantity: Confirmed once requirements are reviewed
  • Sample lead time: Confirmed after we review your part
Quality

Materials & Quality Process

Housing and gear material is chosen for wear resistance, weight, or cost per application, and every gear train is verified before it ships.

  • Housing Material

    Brass, stainless steel, powder-metallurgy alloys, or engineering plastics are selected to match the demands of each application.

  • Gear Material

    Gear material is picked for wear resistance, weight, or cost depending on what the application needs most.

  • Incoming Inspection

    Every gear train passes incoming inspection before it moves further into the build.

  • In-Process Testing

    In-process testing checks the gear train while it is being made.

  • Final Verification

    Final verification confirms dimensional accuracy and consistent performance before the gearbox ships.

Each gear train is inspected on arrival, tested during production, and verified at the end for dimensional accuracy and consistent performance.

Integration

Motor + Gearbox Integration

A mini gearbox works bare or pre-paired with our brushed, brushless, coreless, or stepper motors as a complete DC gear motor assembly — one part number, common in robotics and automation.

Either route keeps the gear train identical; only the drive end changes. This combination is common in robotics and automation builds where torque density and footprint both matter.

Options

Customization Options

  • Ratio & Shaft

    Ratio, output shaft style, and housing dimensions matched to your envelope.

  • Integration

    Encoder integration, PCB soldering, wire harness or module assembly.

  • Materials

    Material selection for wear, weight, or cost targets.

Quote

Get a Quote

Send your ratio, output shaft, and mounting envelope — whether you need the gear train alone or a motor-ready assembly. Batch size and lead time are confirmed once your spec is set.

To start, Get a Quote and share your mini gearbox requirements with our team.

Options

More Options

Need loose gears rather than a housed reducer? Custom-machined precision gears in brass, stainless steel, powder-metallurgy alloys, or engineering plastics are supplied to your drawing.

  • Motor families: Spur, Planetary, Stepper, Brushless DC, Coreless DC, Brushed DC.
  • Gears: Custom-machined to your drawing.
  • Materials: Brass, stainless steel, powder-metallurgy alloys, engineering plastics.
  • Format: Loose gears rather than a housed reducer.
  • Motor families: Spur, Planetary, Stepper, Brushless DC, Coreless DC, Brushed DC.
A Closer Look

Why Source from SLW Motor

Who We Are

Founded in 2012 and based in a 2,400 m² Shenzhen facility, SLW Motor's 56-plus staff bring 15+ years of gear and motor R&D, including work for Japanese manufacturing customers.

What We Offer

  • Certified production: ISO 9001:2015, tested against RoHS and halogen-free requirements
  • Global reach: serving OEM/ODM buyers across 30+ countries
  • Flexible output: small-batch customization and stable bulk supply
Contact Us

Tell us your project or application requirements, and our team will get back to you with technical support, product recommendations, or a customized motor solution.

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