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These tiny gearmotors are available in a range of gear ratios. All of the micro metal gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change.
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Micro Metal Gearmotor HP w/ 100 to 1 gear ratio
Item Details
Micro Metal Gearmotor HP w/ 100 to 1 gear ratio
Item Name:
Micro Metal Gearmotor HP w/ 100 to 1 gear ratio
Item #:
Your Price:
$15.15/ea. - Qty: 10 - 24
$14.35/ea. - Qty: 25 and above
38 Ready to Ship!

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These tiny brushed DC gearmotors are intended for use at 6 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The Micro Metal Gear Motor HP w/ 50:1 gear ratio and Micro Metal Gear Motor HP w/ 75:1 gear ratio are also available.

Micro Metal Gearmotor Table
Micro Metal
@ 6V
Top Zumo Speed
@ 6V
Stall Torque
@ 6V
Stall Current
@ 6V
100:1 HP 320 RPM 25 in/s (65 cm/s) 30 oz·in 1600 mA
75:1 HP 400 RPM 32 in/s (80 cm/s) 22 oz·in 1600 mA
50:1 HP 625 RPM 50 in/s (130 cm/s) 15 oz·in 1600 mA

Features and Specifications:

  • Size: 24 x 10 x 12 mm
  • Weight: 0.34 oz
  • Shaft diameter: 3 mm
  • Gear ratio: 100:1
  • Free-run speed @ 6V: 320 rpm
  • Free-run current @ 6V: 80mA
  • Stall current @ 6V: 1600 mA
  • Stall torque @ 6V: 30 oz·in
  • Extended motor shaft: No

The gearbox has a long (0.365" or 9.27 mm), 3 mm-diameter D- shaped metal output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch). It weighs approximately 0.35 oz (10 g). Versions with the extended motor shaft have a 1mm diameter round shaft that protrudes 4.5 mm from the rear of the motor, between the two motor terminals; this is not pictured in the above dimension diagram.


This gearmotor is a miniature (0.94" x 0.39" x 0.47"), high-power brushed DC motor with 100:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft.
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