172:1 Metal Gearmotor 25Dx56L mm HP Overview This brushed DC gearmotor is available in high- and low-power versions in a number of gear ratios. Integrated quadrature encoders are also available on certain gear ratios, including just the motor portion by itself (i.e. no gearbox). Gear No-LoadSpeed Ratio 6 V Stall Torque 6 V Stall Current 6 V With Encoder Without Encoder 9800 RPM 2 oz-in 6 A motor without gearbox 1:1 5600 RPM 1 oz-in 2.2 A motor without gearbox 2220 RPM 8 oz-in 6 A 25Dx48L mm HP 4.4:1 1280 RPM 5 oz-in 2.2 A 25Dx48L mm 1010 RPM 17 oz-in 6 A 25Dx48L mm HP 25Dx48L mm HP 9.7:1 580 RPM 11 oz-in 2.2 A 25Dx48L mm 25Dx48L mm 480 RPM 36 oz-in 6 A 25Dx50L mm HP 20.4:1 275 RPM 24 oz-in 2.2 A 25Dx50L mm 285 RPM 60 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP 34:1 165 RPM 40 oz-in 2.2 A 25Dx52L mm 25Dx52L mm 210 RPM 80 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP 47:1 120 RPM 50 oz-in 2.2 A 25Dx52L mm 25Dx52L mm 130 RPM 130 oz-in 6 A 25Dx54L mm HP 25Dx54L mm HP 75:1 75 RPM 85 oz-in 2.2 A 25Dx54L mm 25Dx54L mm 100 RPM 160 oz-in 6 A 25Dx54L mm HP 99:1 57 RPM 110 oz-in 2.2 A 25Dx54L mm 57 RPM 260 oz-in 6 A 25Dx56L mm HP 172:1 33 RPM 170 oz-in 2.2 A 25Dx56L mm 25Dx56L mm 227:1 25 RPM 220 oz-in 2.2 A 25Dx56L mm 378:1 15 RPM 250 oz-in 2.2 A 25Dx58L mm 499:1 12 RPM 300 oz-in 2.2 A 25Dx58L mm Note: At some of the higher gear ratios, these motors can generate enough torque to damage themselves. Any torque greater than about 250 oz-in (18 kg-cm) is likely to damage the gearbox, so we recommend that you avoid stalling the 172:1 HP, 227:1, 378:1, and 499:1 versions of these motors at 6 V. These motors are intended for use at 6 V. In general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 9 V range, though they can begin rotating at voltages as low as 1 V. Higher voltages could start negatively affecting the life of the motor. Details for item 1577 Exact gear ratio: (22202222222224) / (12121010101010) (171.79:1) Gearmotor Dimensions These gearmotors have output shafts with a diameter of 4 mm. The Pololu universal aluminummounting hub for 4mm shafts can be used to mount our larger Pololu wheels (60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotors output shaft (see the left picture below). These are the same type of motors used in the Wild Thumper all-terrain chassis, and the gearboxs output shaft works directly with the 120mm-diameter Wild Thumper wheels. Dagu Wild Thumper wheel 12060mm (chrome) with Pololu 25D mm metal Pololu 608mm wheel on a Pololu gearmotor. 25D mm metal gearmotor. The face plate has two mounting holes threaded for M3 screws. You can use our custom-designed 25D mm metal gearmotor bracket (shown in the picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket. Pololu 25D mm gearmotor with bracket. The diagram below shows the dimensions (in mm) of the 25D mm line of gearmotors. The value of L is shown in the table below.