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Twenty white plastic gears 5.5mm diameter nine teeth 2mm bore

Unique-Bargains

Unique-Bargains 5.5mm 9-Tooth Plastic Gear 20 Pcs

SKU CH-E16Z-SA8CW

Pack of 20 white plastic gears with 9 teeth, 5.5 mm diameter, 0.5 modulus and 2 mm bore for DIY motor gearboxes

  • TypeOther Accessories
  • 20-piece pack gives plenty of spares for multiple builds
  • 5 mm outer diameter with 9 teeth for precise gear ratios
  • 2 mm bore fits standard motor shafts directly
  • 5 modulus ensures smooth meshing with matching gears
  • White plastic construction keeps weight low for RC models

Plastic Gear Kit for DIY Gearboxes

This pack contains twenty white plastic gears, each with nine teeth and a 5.5mm outer diameter. They are designed for hobbyists building custom gearboxes on a 2mm motor shaft. The modulus is 0.5 and the gear thickness is 5mm. The lightweight parts suit small-scale RC vehicles and model aircraft projects.

Verify Shaft Diameter and Modulus Compatibility

Check that your motor shaft measures exactly 2mm before ordering, as the bore is sized for this specific diameter. Ensure the driven gear shares a 0.5 modulus to maintain correct meshing and pitch alignment. The gear thickness of 5mm must also fit within the available space inside your gearbox housing. Mismatched dimensions will prevent proper engagement.

Low-Friction Operation with Minimal Heat

Plastic construction keeps rotational inertia low and eliminates the need for lubrication in typical hobby applications. Normal use in lightweight RC drivetrains generates negligible heat and runs silently. The material avoids the electrical conductivity and weight penalties of metal equivalents. Load capacity suits small electric motors only.

Highlights

  • 20-piece pack gives plenty of spares for multiple builds
  • 5 mm outer diameter with 9 teeth for precise gear ratios
  • 2 mm bore fits standard motor shafts directly
  • 5 modulus ensures smooth meshing with matching gears
  • White plastic construction keeps weight low for RC models

Specifications

BrandUnique Bargains
TypeOther Accessories

Questions about this item

What comes in the package and do I need to buy a motor shaft separately?

The package contains 20 white plastic gears with 9 teeth each, 5.5 mm outer diameter and 2 mm bore. A 2 mm motor shaft is required but not included.

Should I choose a different tooth count or modulus for my gearbox?

This pack provides only the 9-tooth, 0.5 modulus size; select it when your design calls for that exact ratio and mesh.

What does the 5.5 mm diameter mean once the gear is mounted on a 2 mm shaft?

The 5.5 mm outer diameter sets the gear's pitch circle for meshing, while the 2 mm bore fits directly onto the motor shaft.

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