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Solarbotics GM13a 150:1 Mini Metal Gear Motor
 
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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.
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These high-quality, miniature 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. 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).
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 controling these low-current motors is a snap with our micro dual serial motor controller.
Specs for the mini metal gearmotors running at 6V:
| gear motor | gear ratio | free-run RPM | free-run current | stall current | stall torque |
| GM18 | 30:1 | 1350 | 145 mA | 480 mA | 2.00 oz * in |
| GM12a | 100:1 | 170 | 48 mA | 390 mA | 10.70 oz * in |
| GM13a | 150:1 | 113 | 40 mA | 370 mA | 14.97 oz * in |
| GM14a | 298:1 | 71 | 50 mA | 533 mA | 30.70 oz * in |
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).
