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  • gear-set-plastic-gears-set-of-4
  • gear-set-plastic-gears-set-of-4

Gear Set, 4-Piece, 12T, 20T, 30T and 40T

4-piece plastic gear set for hobby and science projects.
SKU: GEARSET4
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Plastic Spur Gear Set, 4-Piece, 12T, 20T, 30T and 40T, Assorted Colors

This color-coded plastic spur gear assortment supports hands-on construction of light-duty meshed gear mechanisms for educational models, hobby assemblies, and small motorized projects. Different tooth counts allow users to connect compatible shafts, axles, or project supports and observe how motion is transferred between rotating components.

Product Specifications

Product Type Plastic spur gear set
Package Contents 1 red 40-tooth gear, 1 yellow 30-tooth gear, 1 blue 20-tooth gear, and 1 green 12-tooth gear
Material Plastic
Color Coding Red, yellow, blue, and green gears for identification by tooth count
Compatible Mounting Small motors, shafts, axles, compatible project supports, and custom mechanical assemblies
Duty Rating Educational models and light-duty mechanisms

Gear Dimensions

Gear Color Number of Teeth Approx. Outside Diameter Approx. Center Bore Approx. Thickness
T40 Red 40 41.5 mm 3.2 mm 5.7 mm
T30 Yellow 30 31.3 mm 3.2 mm 5.7 mm
T20 Blue 20 21.3 mm 3.2 mm 6.7 mm
T12 Green 12 13.5 mm 1.9 mm 6.7 mm

Caution:

Dimensions are approximate. Verify shaft diameter and fit before permanent installation. The T12 gear has a smaller center bore than the T20, T30, and T40 gears. These gears are not designed for automotive, industrial, or high-load applications.

Gear Center Bore Recommended Axle - Loose Fit Recommended Axle - Tight Fit
T12 1.9 mm Not recommended 2 mm motor shaft
T20 3.2 mm AXLE3MM - 3 mm metal axle PWHEELSA - Axle Rods For Wheels 1/8
T30 3.2 mm AXLE3MM - 3 mm metal axle PWHEELSA - Axle Rods For Wheels 1/8
T40 3.2 mm AXLE3MM - 3 mm metal axle PWHEELSA - Axle Rods For Wheels 1/8

Applications and Benefits:

  • Demonstrates gear ratios by combining gears with different tooth counts.
  • Supports speed reduction experiments in mechanical assemblies.
  • Shows speed increase when small and large gears are arranged in suitable drive configurations.
  • Illustrates torque multiplication and the relationship between speed and torque.
  • Shows how meshed spur gears reverse rotational direction.
  • Supports basic power transmission demonstrations.
  • Provides reusable components for science experiments and STEM activities.
  • Fits classroom engineering activities and mechanical demonstrations.
  • Supports small DC motor projects and motorized science models.
  • Provides gears for robotics prototypes, hobby mechanisms, custom builds, and light-duty prototypes.
  • Availability: In Stock
  • Model: GEARSET4
  • Brand: MiniScience