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Twenty white plastic 12-tooth gears 7 mm diameter 2.5 mm bore

Unique-Bargains

Unique-Bargains 12-Teeth Plastic Gear Cog Wheel 2.5 mm Shaft 20Pcs

SKU CH-KJP3-S53W0

Set of 20 white plastic gears with 12 teeth each, 0.5 modulus and 2.5 mm bore for DIY gearboxes

  • Product typeOther Accessories
  • 20-piece pack keeps spares on hand for multiple builds
  • 12-tooth design gives precise gear ratio for custom gearboxes
  • 5 mm bore fits standard RC motor shafts directly
  • 7 mm outer diameter suits compact toy drivetrains
  • White plastic construction resists corrosion in hobby environments

Plastic Gear Cog Wheel 12 Teeth

This pack contains twenty plastic spur gears designed for small electric motors with a 2.5 mm shaft. They suit hobbyists building or repairing RC vehicles, drones and DIY gearboxes. Each gear has twelve teeth on a 7 mm outer diameter and a 5 mm face width. The white plastic construction keeps rotating mass low.

Capacity and Headroom

The 0.5 modulus profile meshes with matching pinions to transmit modest torque in lightweight drive-trains. Twelve teeth give a fine step for gradual ratio changes but limit maximum torque before stripping. At 4 g per gear the set adds negligible weight to airframes. They are not suited for high-load drivetrains or shafts larger than 2.5 mm.

2.5 mm Bore Constraint

The 2.5 mm bore is the single dimension that decides fit; it only accepts motors or shafts of that exact diameter. Builders using 2 mm, 3 mm or imperial shafts must source different gears. No keyway or set-screw hole is present, so retention relies on a press fit or adhesive.

How it compares

Measured against everything we stock in Boat Engine Components & Locks, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 90% of the 21 comparable items (median $6.99).

Specifications

Product
Brand nameUnique Bargains
Product typeOther Accessories

Questions about this item

Will these 12-tooth 2.5 mm bore gears mesh with other 0.5 modulus plastic gears I already have?

Yes, the 0.5 modulus and 12-tooth specification means they will mesh correctly with any other gear cut to the same 0.5 modulus standard.

How can I confirm the 2.5 mm bore fits my motor shaft before assembling the gearbox?

Slide a gear onto the 2.5 mm motor spindle; it should sit flush with light friction and no visible wobble when the shaft is rotated by hand.

The pack lists 20 pieces — does it include any set screws or retaining clips for the 2.5 mm shaft?

No, the package contains only the 20 white plastic gears; set screws, retaining clips or glue must be sourced separately.

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