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Full machine-readable index: https://core-electronics.com.au/llms.txt # 131:1 Metal Gearmotor 37Dx57L mm **Type:** Product page · **SKU:** POLOLU-1107 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/131-1-metal-gearmotor-37dx57l-mm.html ([markdown](https://core-electronics.com.au/131-1-metal-gearmotor-37dx57l-mm.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 ## Overview This powerful brushed DC gearmotor is available in six different gear ratios. Versions with an integrated quadrature encoder are also available, including just the [motor and encoder portion](https://core-electronics.com.au/motor-with-64-cpr-encoder-for-37d-mm-metal-gearmotors-no-gearbox.html) by itself (no gearbox). | Gear Ratio | No-Load Speed @ 12 V | Stall Torque @ 12 V | Stall Current @ 12 V | ![](https://core-electronics.com.au/media/remote_images/0J4045.100_c6UjZd.jpg) With Encoder | ![](https://core-electronics.com.au/media/remote_images/0J901.80_yqkBJ0.jpg) Without Encoder | |---|---|---|---|---|---| | 1:1 | 11,000 RPM | 5 oz-in | 5 A | [motor without gearbox](https://core-electronics.com.au/motor-with-64-cpr-encoder-for-37d-mm-metal-gearmotors-no-gearbox.html) | | | 19:1 | 500 RPM | 84 oz-in | 5 A | [37Dx52L mm](https://core-electronics.com.au/19-1-metal-gearmotor-37dx52l-mm-with-64-cpr-encoder.html) | [37Dx52L mm](https://core-electronics.com.au/19-1-metal-gearmotor-37dx52l-mm.html) | | 30:1 | 350 RPM | 110 oz-in | 5 A | [37Dx52L mm](https://core-electronics.com.au/30-1-metal-gearmotor-37dx52l-mm-with-64-cpr-encoder.html) | [37Dx52L mm](https://core-electronics.com.au/30-1-metal-gearmotor-37dx52l-mm.html) | | 50:1 | 200 RPM | 170 oz-in | 5 A | [37Dx54L mm](https://core-electronics.com.au/50-1-metal-gearmotor-37dx54l-mm-with-64-cpr-encoder.html) | [37Dx54L mm](https://core-electronics.com.au/50-1-metal-gearmotor-37dx54l-mm.html) | | 70:1 | 150 RPM | 200 oz-in | 5 A | [37Dx54L mm](https://core-electronics.com.au/70-1-metal-gearmotor-37dx54l-mm-with-64-cpr-encoder.html) | [37Dx54L mm](https://core-electronics.com.au/70-1-metal-gearmotor-37dx54l-mm.html) | | 100:1 | 100 RPM | 220 oz-in | 5 A | [37Dx57L mm](https://core-electronics.com.au/100-1-metal-gearmotor-37dx57l-mm-with-64-cpr-encoder.html) | [37Dx57L mm](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-1106) | | 131:1 | 80 RPM | 250 oz-in | 5 A | [37Dx57L mm](https://core-electronics.com.au/131-1-metal-gearmotor-37dx57l-mm-with-64-cpr-encoder.html) | [37Dx57L mm](https://core-electronics.com.au/131-1-metal-gearmotor-37dx57l-mm.html) | These motors are intended for use at 12 V, though the motor can begin rotating at voltages as low as 1 V. ## Details for item #1107 Exact gear ratio: (25×30×30×28×30) / (10×10×10×12×12) = bb(131.25:1) ## Gearmotor Dimensions: The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighboring holes are 15.5 mm apart. You can use Pololu's custom [37D metal gearmotor bracket](https://core-electronics.com.au/pololu-stamped-aluminum-l-bracket-pair-for-37d-mm-metal-gearmotors.html) (shown in the left picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket. | \| [![](https://core-electronics.com.au/media/remote_images/0J1108.330_s6YVBa.jpg%3Fd003edcb57980bc5ead6f615d4f868a4)![](https://core-electronics.com.au/media/remote_images/zoom-d0cfc0fffa825c4654893ef42b77cee3_qmt5Hx.png)](https://core-electronics.com.au/#) \| \|---\| \| Gearmotor with bracket and hub. \| | \| [![](https://core-electronics.com.au/media/remote_images/0J2595.250_PyBOwS.jpg%3F95be65618507363e4feac18d54979eef)![](https://core-electronics.com.au/media/remote_images/zoom-d0cfc0fffa825c4654893ef42b77cee3_qmt5Hx.png)](https://core-electronics.com.au/#) \| \|---\|---\| \| Black Pololu 90×10mm wheel on a Pololu 37D mm metal gearmotor. \| | |---| Please note that unlike Pololu's smaller metal gearmotors, these 37D mm gearmotors have output shafts with a diameter of 6 mm. The [Pololu universal aluminum mounting hub for 6mm shafts](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-6mm-shaft-4-40-holes-2-pack.html) can be used to mount Pololu's larger [Pololu wheels](https://core-electronics.com.au/#) (80mm- and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft (see the right picture above). The picture below shows the dimensions (in mm) of the 37D mm line of gearmotors. The value of `X` is **22 mm** for the [19:1 37Dx52L mm](https://core-electronics.com.au/19-1-metal-gearmotor-37dx52l-mm.html) and [30:1 37Dx52L mm](https://core-electronics.com.au/30-1-metal-gearmotor-37dx52l-mm.html) versions, **24 mm** for the [50:1 37Dx54L mm](https://core-electronics.com.au/50-1-metal-gearmotor-37dx54l-mm.html) and [70:1 37Dx54L mm](https://core-electronics.com.au/70-1-metal-gearmotor-37dx54l-mm.html) versions, and **26.5 mm** for the [100:1 37Dx57L mm](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-1106) and [131:1 37Dx57L mm](https://core-electronics.com.au/131-1-metal-gearmotor-37dx57l-mm.html) versions. | ![](https://core-electronics.com.au/media/remote_images/0J906.600_DINLTA.jpg%3Fdad204e38dd841fb0b835f4cbc98ccbe) | |---| | 37D mm metal gearmotor dimensions (units in mm). | **Warning**: Do not screw too far into the mounting holes as the screws can hit the gears. Pololu recommend screwing no further than 3mm (1/8") into the screw hole. The operational specs listed in the table below were measured at 6 V. At 12 V, the no-load RPM, stall current, and stall torque will all be approximately twice their 6V values. To see the motor specs for 12V operation, please see the short description at the top of this page or this product’s specification tab. | ![](https://core-electronics.com.au/media/remote_images/0J902.300_dIZ3Vi.jpg%3Fce900e2320a7ad0750120fb516e668bf) | |---| | 37D mm metal gearmotor next to a micro metal gearmotor for size comparison. | ## Selecting the Right Gearmotor Pololu offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Pololu's **[metal gearmotor comparison table](https://core-electronics.com.au/search/compare/51)** can help you find the motor that best meets your project’s requirements. | ![](https://core-electronics.com.au/media/remote_images/0J838.600_dnZK0L.jpg%3Ffc41071cc34361a828546fe0fcc0b14f) | |---| | Some of the Pololu metal gearmotors. | ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/1/3/131_1_metal_gearmotor_37dx57l_mm__pololu_1107__00.jpg)