Solarbotics GM18 30:1 Mini Metal Gear Motor

Solarbotics GM18 30:1 Mini Metal Gear Motor
Pololu item #: 641 15 in stock

Price break Unit price (US$)
1 19.75
10 17.80


The Solarbotics GM18 30:1 mini metal gear motor is a compact (1.14" x 0.39" x 0.47") brushed DC 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.

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 Description Specifications (7) Pictures (1) Resources (4) FAQs (0) 

Discontinuation notice: We will be discontinuing these gearmotors when the remaining stock is gone. Please consider our micro metal gearmotors for a wide selection of alternative gearmotors with the same form factor (but longer output shafts).

These miniature brushed DC metal gear motors have 3 mm diameter output shafts that mate fairly well with any 1/8-inch hole output device, including the Solarbotics RW2 high-traction rubber wheels. Alternatively, you can use the Pololu universal mounting hub to mount custom wheels and mechanism to the micro metal gearmotor’s output shaft.

The brass faceplates have two mounting holes threaded for 1.7 (dia) x 0.35 (mm/thd) x 4mm long screws (M1.7 × 4 mm), or you can use our mounting bracket, which is specifically designed to securely mount the gearmotor while enclosing the exposed gears.

These small motors come in a variety of gear ratios, have a compact size (1.14" x 0.39" x 0.47"), and weigh only 0.29 oz, making them a great choice for small robot designs — and controlling these low-current motors is a snap with our qik 2s9v1 dual serial motor controller.

Solarbotics mini metal gearmotor dimensions (in mm).

You can download a pdf version of this drawing with imperial dimensions (119k pdf) or metric dimensions (118k pdf).

Specs for the Solarbotics mini metal gearmotors running at 6 V:

gear motor gear ratio free-run RPM free-run current stall current stall torque price
GM18 30:1 566 48 mA 500 mA 7.29 oz-in $19.75
GM12a 100:1 170 48 mA 390 mA 10.70 oz-in $19.75
GM13a 150:1 113 40 mA 370 mA 14.97 oz-in $19.75
GM14a 298:1 71 50 mA 533 mA 30.70 oz-in $19.75



Specs for the similar, less expensive Pololu metal gearmotors running at 6 V:

gearmotor gear ratio free-run RPM free-run current stall current     stall torque
(oz-in / kg-cm)
price
5:1 Micro 5:1 2450 50 mA 360 mA 1 / 0.1 $15.95
10:1 Micro 10:1 1250 40 mA 360 mA 2 / 0.2 $15.95
30:1 Micro 30:1 440 40 mA 360 mA 4 / 0.3 $15.95
50:1 Micro 50:1 250 40 mA 360 mA 6 / 0.4 $15.95
100:1 Micro 100:1 120 40 mA 360 mA 10 / 0.7 $15.95
150:1 Micro 150:1 85 40 mA 360 mA 15 / 1.1 $15.95
210:1 Micro 210:1 60 40 mA 360 mA 19 / 1.3 $15.95
250:1 Micro 250:1 50 30 mA 360 mA 22 / 1.6 $15.95
298:1 Micro 298:1 45 30 mA 360 mA 25 / 1.8 $15.95
5:1 Micro HP 5:1 6000 120 mA 1600 mA 2 / 0.1 $15.95
10:1 Micro HP 10:1 3000 120 mA 1600 mA 4 / 0.3 $15.95
30:1 Micro HP 30:1 1000 120 mA 1600 mA 8 / 0.6 $15.95
50:1 Micro HP 50:1 625 100 mA 1600 mA 15 / 1.0 $15.95
100:1 Micro HP 100:1 315 80 mA 1600 mA 25 / 1.8 $15.95
150:1 Micro HP 150:1 200 70 mA 1600 mA 45 / 3.2 $15.95
210:1 Micro HP 210:1 140 70 mA 1600 mA 65 / 4.7 $15.95
250:1 Micro HP 250:1 120 70 mA 1600 mA 75 / 5.4 $15.95
298:1 Micro HP 298:1 100 70 mA 1600 mA 90 / 6.5 $15.95
24:1 Mini 24:1 410 70 mA 420 mA 4 / 0.3 $14.95
100:1 Mini 100:1 140 90 mA 800 mA 15 / 1.0 $17.95
35:1 Mini 35:1 350 70 mA 1500 mA 35 / 2.5 $17.95
25:1 20Dx44L mm 25:1 500 160 mA 3300 mA 20 / 1.5 $19.95
19:1 37Dx52L mm 19:1 250 170 mA 2500 mA 40 / 2.9 $24.95



Note: These gearmotors do not come with mounting hardware, instructions, or packaging. The brass faceplate has two mounting holes threaded for 1.7 (dia) x 0.35 (mm/thd) x 4mm long screws (M1.7 × 4 mm), and our micro metal gearmotor bracket (sold separately) gives you even more mounting options.

People often buy this product together with:

Solarbotics GM12a 100:1 Mini Metal Gear Motor Solarbotics GM12a 100:1 Mini Metal Gear Motor
Solarbotics RW2 Wheel (external set screw) Solarbotics RW2 Wheel (external set screw)
Pololu Micro Metal Gearmotor Bracket Pair - Black Pololu Micro Metal Gearmotor Bracket Pair - Black