> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Solarbotics GM12a 100:1 Mini Metal Gear Motor **Type:** Product page · **SKU:** POLOLU-638 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/solarbotics-gm12a-100-1-mini-metal-gear-motor.html ([markdown](https://core-electronics.com.au/solarbotics-gm12a-100-1-mini-metal-gear-motor.html.md)) ## Retired product This product is retired and no longer available for purchase. Search the catalogue for an alternative. ## How to buy - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description **Discontinuation notice:** Pololu will be discontinuing these gearmotors when the remaining stock is gone. Please consider Pololu's **[micro metal gearmotors](https://core-electronics.com.au/#)** 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](https://core-electronics.com.au/solarbotics-rw2-wheel-external-set-screw.html). Alternatively, you can use the [Pololu universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-3mm-shaft-2-56-holes-2-pack.html) 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 Pololu's [mounting bracket](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html), 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 Pololu's [qik 2s9v1 dual serial motor controller](https://core-electronics.com.au/pololu-qik-2s9v1-dual-serial-motor-controller.html). | ![](https://core-electronics.com.au/media/remote_images/0J3698.600_vPUFH7.png%3F0e327416f268eab2946790646ebc8033) | |---| | 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](https://core-electronics.com.au/solarbotics-gm18-30-1-mini-metal-gear-motor.html) | 30:1 | 566 | 48 mA | 500 mA | 7.29 oz-in | $19.75 | | [GM12a](https://core-electronics.com.au/solarbotics-gm12a-100-1-mini-metal-gear-motor.html) | 100:1 | 170 | 48 mA | 390 mA | 10.70 oz-in | $19.75 | | [GM13a](https://core-electronics.com.au/solarbotics-gm13a-150-1-mini-metal-gear-motor.html) | 150:1 | 113 | 40 mA | 370 mA | 14.97 oz-in | $19.75 | | [GM14a](https://core-electronics.com.au/solarbotics-gm14a-298-1-mini-metal-gear-motor.html) | 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](https://core-electronics.com.au/5-1-micro-metal-gearmotor.html) | 5:1 | 2450 | 50 mA | 360 mA | 1 / 0.1 | $15.95 | | [10:1 Micro](https://core-electronics.com.au/10-1-micro-metal-gearmotor.html) | 10:1 | 1250 | 40 mA | 360 mA | 2 / 0.2 | $15.95 | | [30:1 Micro](https://core-electronics.com.au/30-1-micro-metal-gearmotor.html) | 30:1 | 440 | 40 mA | 360 mA | 4 / 0.3 | $15.95 | | [50:1 Micro](https://core-electronics.com.au/50-1-micro-metal-gearmotor.html) | 50:1 | 250 | 40 mA | 360 mA | 6 / 0.4 | $15.95 | | [100:1 Micro](https://core-electronics.com.au/100-1-micro-metal-gearmotor.html) | 100:1 | 120 | 40 mA | 360 mA | 10 / 0.7 | $15.95 | | [150:1 Micro](https://core-electronics.com.au/150-1-micro-metal-gearmotor.html) | 150:1 | 85 | 40 mA | 360 mA | 15 / 1.1 | $15.95 | | [210:1 Micro](https://core-electronics.com.au/210-1-micro-metal-gearmotor.html) | 210:1 | 60 | 40 mA | 360 mA | 19 / 1.3 | $15.95 | | [250:1 Micro](https://core-electronics.com.au/250-1-micro-metal-gearmotor.html) | 250:1 | 50 | 30 mA | 360 mA | 22 / 1.6 | $15.95 | | [298:1 Micro](https://core-electronics.com.au/298-1-micro-metal-gearmotor.html) | 298:1 | 45 | 30 mA | 360 mA | 25 / 1.8 | $15.95 | | [5:1 Micro HP](https://core-electronics.com.au/5-1-micro-metal-gearmotor-hp.html) | 5:1 | 6000 | 120 mA | 1600 mA | 2 / 0.1 | $15.95 | | [10:1 Micro HP](https://core-electronics.com.au/10-1-micro-metal-gearmotor-hp.html) | 10:1 | 3000 | 120 mA | 1600 mA | 4 / 0.3 | $15.95 | | [30:1 Micro HP](https://core-electronics.com.au/30-1-micro-metal-gearmotor-hp.html) | 30:1 | 1000 | 120 mA | 1600 mA | 8 / 0.6 | $15.95 | | [50:1 Micro HP](https://core-electronics.com.au/50-1-micro-metal-gearmotor-hp.html) | 50:1 | 625 | 100 mA | 1600 mA | 15 / 1.0 | $15.95 | | [100:1 Micro HP](https://core-electronics.com.au/100-1-micro-metal-gearmotor-hp.html) | 100:1 | 315 | 80 mA | 1600 mA | 25 / 1.8 | $15.95 | | [150:1 Micro HP](https://core-electronics.com.au/150-1-micro-metal-gearmotor-hp.html) | 150:1 | 200 | 70 mA | 1600 mA | 45 / 3.2 | $15.95 | | [210:1 Micro HP](https://core-electronics.com.au/210-1-micro-metal-gearmotor-hp.html) | 210:1 | 140 | 70 mA | 1600 mA | 65 / 4.7 | $15.95 | | [250:1 Micro HP](https://core-electronics.com.au/250-1-micro-metal-gearmotor-hp.html) | 250:1 | 120 | 70 mA | 1600 mA | 75 / 5.4 | $15.95 | | [298:1 Micro HP](https://core-electronics.com.au/298-1-micro-metal-gearmotor-hp.html) | 298:1 | 100 | 70 mA | 1600 mA | 90 / 6.5 | $15.95 | | [24:1 Mini](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-991) | 24:1 | 410 | 70 mA | 420 mA | 4 / 0.3 | $14.95 | | [100:1 Mini](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-990) | 100:1 | 140 | 90 mA | 800 mA | 15 / 1.0 | $17.95 | | [35:1 Mini](https://core-electronics.com.au/35-1-mini-metal-gearmotor.html) | 35:1 | 350 | 70 mA | 1500 mA | 35 / 2.5 | $17.95 | | [25:1 20Dx44L mm](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-1092) | 25:1 | 500 | 160 mA | 3300 mA | 20 / 1.5 | $19.95 | | [19:1 37Dx52L mm](https://core-electronics.com.au/19-1-metal-gearmotor-37dx52l-mm.html) | 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 Pololu's [micro metal gearmotor bracket](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) (sold separately) gives you even more mounting options. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/o/solarbotics_gm12a_100_1_mini_metal_gear_motor__pololu_638__00.jpg)