3mm Shaft Gearmotors

Compare Micro Metal Gearmotors

With a cross section measuring only 10 × 12 mm (0.39" × 0.47"), these high-quality gearmotors come in a variety of gear ratios ranging from 5:1 to 1000:1. High- and low-power versions are available, as well as an optional extended motor shaft.

Pololu item #: 1124
Price: $5.49

120:1 Mini Plastic Gearmotor 90-Degree 3mm D-Shaft Output

This compact, inexpensive, low-current gearmotor (motor with a 120:1 reduction gearbox) is well suited for use in small robots. At 4.5 V, it has a free-run speed of 120 RPM and a stall torque of approximately 20 oz-in (however, the built-in safety clutch might start slipping before the stall torque is reached). The D-shaped output shaft has a diameter of 3 mm and works with the Pololu wheels and 3mm universal aluminum mounting hub. This gearbox output shaft is perpendicular to the motor shaft.

Pololu item #: 1593
Price: $5.49

180:1 Mini Plastic Gearmotor 90-Degree 3mm D-Shaft Output

This compact, inexpensive, low-current gearmotor (motor with a 180:1 reduction gearbox) is well suited for use in small robots. At 4.5 V, it has a free-run speed of 80 RPM and a stall torque of approximately 30 oz-in (however, the built-in safety clutch might start slipping before the stall torque is reached). The D-shaped output shaft has a diameter of 3 mm and works with the Pololu wheels and 3mm universal aluminum mounting hub. This gearbox output shaft is perpendicular to the motor shaft.

Pololu item #: 1125
Price: $5.49

120:1 Mini Plastic Gearmotor Offset 3mm D-Shaft Output

Pololu item #: 1594
Price: $5.49

180:1 Mini Plastic Gearmotor Offset 3mm D-Shaft Output

On sale!
Pololu item #: 991
Price: $14.95 ~~$17.95~~

24:1 Mini Metal Gearmotor

This high-quality metal gearmotor is a compact (1.26" x 0.63" x 0.63") motor with an enclosed 24:1 metal gearbox. These units have a 0.275"-long, 3 mm-diameter D-shaped output shaft.

Key specs at 6 V: 410 RPM and 70 mA free-run, 4 oz-in (0.3 kg-cm) and 0.42 A stall.

Clearance: This product is being replaced by the 35:1 metal gearmotor 15.5Dx30L mm.

Pololu item #: 1091
Price: $17.95

35:1 Mini Metal Gearmotor

This gearmotor is a compact (1.50" x 0.59" x 0.47"), high-quality motor with 35:1 metal gearbox. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft that matches the micro metal gearmotor output shafts.

Key specs at 6 V: 350 RPM and 70 mA free-run, 20 oz-in (1.4 kg-cm) and 1.5 A stall.

Pololu item #: 1597
Price: $17.95

35:1 Metal Gearmotor 15.5Dx30L mm

This high-quality metal gearmotor is a compact (1.16" x 0.61" x 0.61") motor with an enclosed 35:1 metal gearbox. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft.

Key specs at 6 V: 460 RPM and 60 mA free-run, 13 oz-in (1.0 kg-cm) and 0.8 A stall.

Pololu item #: 1598
Price: $17.95

115:1 Metal Gearmotor 15.5Dx30L mm

This high-quality metal gearmotor is a compact (1.16" x 0.61" x 0.61") motor with an enclosed 115:1 metal gearbox. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft.

Key specs at 6 V: 140 RPM and 60 mA free-run, 35 oz-in (2.5 kg-cm) and 0.8 A stall.

Pololu item #: 638
Price: $19.75

Solarbotics GM12a 100:1 Mini Metal Gear Motor

The Solarbotics GM12a 100:1 mini metal gear motor is a compact (1.14" x 0.39" x 0.47"), high-quality motor with metal gears, very similar to the Sanyo NA2S motor. The major difference is that these Sanyo motor look-a-likes have brass front faceplates (not steel ones), and cost less.

Pololu item #: 639
Price: $19.75

Solarbotics GM13a 150:1 Mini Metal Gear Motor

The Solarbotics GM13a 150:1 mini metal gear motor is a compact (1.14" x 0.39" x 0.47"), high-quality motor with metal gears, very similar to the Sanyo NA3S motor. The major difference is that these Sanyo motor look-a-likes have brass front faceplates (not steel ones), and cost less.

Pololu item #: 640
Price: $19.75

Solarbotics GM14a 298:1 Mini Metal Gear Motor

The Solarbotics GM14a 298:1 mini metal gear motor is a compact (1.14" x 0.39" x 0.47"), high-quality motor with metal gears, very similar to the Sanyo NA4S motor. The major difference is that these Sanyo motor look-a-likes have brass front faceplates (not steel ones), and cost less.

Pololu item #: 641
Price: $19.75

Solarbotics GM18 30:1 Mini Metal Gear Motor

The Solarbotics GM18 30:1 mini metal gear motor is a compact (1.14" x 0.39" x 0.47"), high-quality motor with metal gears, similar to the Sanyo motors such as NA2S, NA3S, and NA4S. The major difference is that these Sanyo motor look-a-likes have brass front faceplates (not steel ones), and cost less.

On sale!
Pololu item #: 68
Price: $8.29 ~~$11.00~~

Tamiya 70110 4-Speed Crank-Axle Gearbox Kit

This gearbox has four possible gear ratios, including the highest gear ratio of Tamiya’s gearbox series, 5402:1. The other options are 126:1, 441:1, and 1543:1. This gearbox also features a worm gear, which locks the output shaft when the motor is not turning.

Pololu item #: 1679
Price: $7.95

Tamiya 89916 4-Speed Crank-Axle Gearbox Kit - Clear

On sale!
Pololu item #: 69
Price: $7.59 ~~$8.75~~

Tamiya 70103 Universal Gearbox Kit

Unlike the other gearboxes in Tamiya’s series, the universal gearbox has a thin metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.

On sale!
Pololu item #: 118
Price: $7.55 ~~$8.75~~

Tamiya 70167 Single Gearbox (4-Speed) Kit

The single gearbox is perfect if you like the gear ratio options of the 70168 double gearbox but need just one motor or added flexibility in positioning multiple output shafts. Available gear ratios are: 12.7:1, 38:1, 115:1, or 344:1.

Pololu item #: 1678
Price: $7.49

Tamiya 89917 Single Gearbox Kit - Clear

On sale!
Pololu item #: 114
Price: $9.25 ~~$12.50~~

Tamiya 70168 Double Gearbox Kit

Tamiya’s double gearbox packs two independent gear trains into a compact and affordable package that is great for small mobile robots. Each side can be assembled to have one of four gear ratios: 12.7:1, 38:1, 115:1, or 344:1.

Pololu item #: 1677
Price: $8.25

Tamiya 89918 Double Gearbox Kit - Clear

On sale!
Pololu item #: 61
Price: $8.95 ~~$12.00~~

Tamiya 70097 Twin-Motor Gearbox Kit

Tamiya’s twin-motor gearbox consists of two independent motors and gearboxes in one compact housing, making it perfect for small robots. You can assemble the gearboxes to have a 58:1 or a 204:1 gear ratio.

Pololu item #: 1680
Price: $8.25

Tamiya 89915 Twin-Motor Gearbox Kit - Clear

Pololu item #: 67
Price: $6.95

Tamiya 70093 3-Speed Crank-Axle Gearbox Kit

Tamiya’s 3-speed crank-axle gearbox looks very much like half of the twin-motor gearbox (with an added gear ratio option). This compact gearbox can be built in one of three gear ratios (17:1, 58:1, and 204:1), and is Tamiya’s cheapest, general-purpose gearbox.

Pololu item #: 1681
Price: $7.95

Tamiya 89914 3-Speed Crank-Axle Gearbox Kit - Clear

On sale!
Pololu item #: 1684
Price: $10.95 ~~$15.00~~

Tamiya 70189 Mini Motor Low-Speed Gearbox (4-Speed) Kit

Tamiya’s 4-speed low-speed mini motor gearbox features a more compact 030-form-factor motor driving a single gear train that can be assembled to have one of 4 gear ratios: 71.4:1, 149.9:1, 314.9:1, or 661.2:1. The gear train includes a self-locking worm gear.

On sale!
Pololu item #: 1682
Price: $10.95 ~~$15.00~~

Tamiya 70188 Mini Motor Gearbox (8-Speed) Kit

Tamiya’s 8-speed mini motor gearbox features a more compact 030-form-factor motor driving a single gear train that can be assembled to have one of eight gear ratios: 7.5:1, 9.5:1, 15.7:1, 19.9:1, 32.9:1, 41.8:1, 79.1:1, or 87.8:1.

On sale!
Pololu item #: 1683
Price: $10.95 ~~$15.00~~

Tamiya 70190 Mini Motor Multi-Ratio Gearbox (12-Speed) Kit

Tamiya’s 12-speed multi-ratio mini motor gearbox features a more compact 030-form-factor motor driving a single gear train that can be assembled to have one of 12 gear ratios: 4.6:1, 5.1:1, 9.7:1, 10.8:1, 20.4:1, 22.6:1, 42.8:1, 47.5:1, 89.9:1, 99.8:1, 188.7:1, or 209.7:1.

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