25D mm Gearmotors

Gear Ratio No-Load
Speed
@ 6 V
Stall Torque
@ 6 V
Stall Current
@ 6 V


With Encoder


Without Encoder
1:1 9800 RPM 2 oz-in 6 A motor without gearbox
5600 RPM 1 oz-in 2.2 A motor without gearbox
4.4:1 2220 RPM 8 oz-in 6 A 25Dx48L mm HP
1280 RPM 5 oz-in 2.2 A 25Dx48L mm
9.7:1 1010 RPM 17 oz-in 6 A 25Dx48L mm HP 25Dx48L mm HP
580 RPM 11 oz-in 2.2 A 25Dx48L mm 25Dx48L mm
20.4:1 480 RPM 36 oz-in 6 A 25Dx50L mm HP
275 RPM 24 oz-in 2.2 A 25Dx50L mm
34:1 285 RPM 60 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP
165 RPM 40 oz-in 2.2 A 25Dx52L mm 25Dx52L mm
47:1 210 RPM 80 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP
120 RPM 50 oz-in 2.2 A 25Dx52L mm 25Dx52L mm
75:1 130 RPM 130 oz-in 6 A 25Dx54L mm HP 25Dx54L mm HP
75 RPM 85 oz-in 2.2 A 25Dx54L mm 25Dx54L mm
99:1 100 RPM 160 oz-in 6 A 25Dx54L mm HP
57 RPM 110 oz-in 2.2 A 25Dx54L mm
172:1 57 RPM 260 oz-in 6 A 25Dx56L mm HP
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.

Pololu item #: 1570
Price: $21.95
Quantity:

This cylindrical, 1.89" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 4.4:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 2220 RPM and 450 mA free-run, 8 oz-in (0.58 kg-cm) and 6 A stall.

Pololu item #: 1581
Price: $19.95
Quantity:

This cylindrical, 1.89" x 0.98" x 0.98" brushed DC gearmotor with a 4.4:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 1280 RPM and 80 mA free-run, 5 oz-in (0.36 kg-cm) and 2.2 A stall.

Pololu item #: 1571
Price: $21.95
Quantity:

This cylindrical, 1.89" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 9.7:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 1010 RPM and 450 mA free-run, 17 oz-in (1.2 kg-cm) and 6 A stall.

Pololu item #: 2271
Price: $36.95
Quantity:

This cylindrical, 2.38" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 9.68:1 metal gearbox to deliver a lot of power in a relatively small package. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 465 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor and a version without an encoder.

Key specs at 6 V: 1010 RPM and 450 mA free-run, 17 oz-in (1.2 kg-cm) and 6 A stall.

Pololu item #: 1582
Price: $19.95
Quantity:

This cylindrical, 1.89" x 0.98" x 0.98" brushed DC gearmotor with a 9.7:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 580 RPM and 80 mA free-run, 11 oz-in (0.79 kg-cm) and 2.2 A stall.

Pololu item #: 2282
Price: $34.95
Quantity:

This cylindrical, 2.38" x 0.98" x 0.98" brushed DC gearmotor with a 9.68:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 465 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 580 RPM and 80 mA free-run, 11 oz-in (0.79 kg-cm) and 2.2 A stall.

Pololu item #: 1572
Price: $21.95
Quantity:

This cylindrical, 1.97" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 20.4:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 480 RPM and 450 mA free-run, 36 oz-in (2.6 kg-cm) and 6 A stall.

Pololu item #: 1583
Price: $19.95
Quantity:

This cylindrical, 1.97" x 0.98" x 0.98" brushed DC gearmotor with a 20.4:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 275 RPM and 80 mA free-run, 24 oz-in (1.7 kg-cm) and 2.2 A stall.

Pololu item #: 1573
Price: $21.95
Quantity:

This cylindrical, 2.05" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 34:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This is the same motor used on the Dagu Wild Thumper 6WD all-terrain chassis 34:1. We also carry a lower-power version of this gearmotor and a version with an encoder.

Key specs at 6 V: 285 RPM and 450 mA free-run, 60 oz-in (4.3 kg-cm) and 6 A stall.

Pololu item #: 2273
Price: $36.95
Quantity:

This cylindrical, 2.54" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 34.014:1 metal gearbox to deliver a lot of power in a relatively small package. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 1633 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor and a version without an encoder.

Key specs at 6 V: 285 RPM and 450 mA free-run, 60 oz-in (4.3 kg-cm) and 6 A stall.

Pololu item #: 1584
Price: $19.95
Quantity:

This cylindrical, 2.05" x 0.98" x 0.98" brushed DC gearmotor with a 34:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available with an encoder.

Key specs at 6 V: 165 RPM and 80 mA free-run, 40 oz-in (2.9 kg-cm) and 2.2 A stall.

Pololu item #: 2284
Price: $34.95
Quantity:

This cylindrical, 2.54" x 0.98" x 0.98" brushed DC gearmotor with a 34.014:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 1633 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 165 RPM and 80 mA free-run, 40 oz-in (2.9 kg-cm) and 2.2 A stall.

Pololu item #: 1574
Price: $21.95
Temporarily out of stock. See product page to backorder.

This cylindrical, 2.05" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 47:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 210 RPM and 450 mA free-run, 80 oz-in (5.8 kg-cm) and 6 A stall.

Pololu item #: 2274
Price: $36.95
Quantity:

This cylindrical, 2.54" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 46.851:1 metal gearbox to deliver a lot of power in a relatively small package. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2249 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor and a version without an encoder.

Key specs at 6 V: 210 RPM and 450 mA free-run, 80 oz-in (5.8 kg-cm) and 6 A stall.

Pololu item #: 1585
Price: $19.95
Quantity:

This cylindrical, 2.05" x 0.98" x 0.98" brushed DC gearmotor with a 47:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 120 RPM and 80 mA free-run, 50 oz-in (3.6 kg-cm) and 2.2 A stall.

Pololu item #: 2285
Price: $34.95
Quantity:

This cylindrical, 2.54" x 0.98" x 0.98" brushed DC gearmotor with a 46.851:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2249 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 120 RPM and 80 mA free-run, 50 oz-in (3.6 kg-cm) and 2.2 A stall.

Pololu item #: 1575
Price: $21.95
Quantity:

This cylindrical, 2.13" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 75:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This is the same motor used on the Dagu Wild Thumper 6WD all-terrain chassis 75:1. We also carry a lower-power version of this gearmotor and a version with an encoder.

Key specs at 6 V: 130 RPM and 450 mA free-run, 130 oz-in (9.4 kg-cm) and 6 A stall.

Pololu item #: 2275
Price: $36.95
Quantity:

This cylindrical, 2.62" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 74.83:1 metal gearbox to deliver a lot of power in a relatively small package. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 3592 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor and a version without an encoder.

Key specs at 6 V: 130 RPM and 450 mA free-run, 130 oz-in (9.4 kg-cm) and 6 A stall.

Pololu item #: 1586
Price: $19.95
Quantity:

This cylindrical, 2.13" x 0.98" x 0.98" brushed DC gearmotor with a 75:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available with an encoder.

Key specs at 6 V: 75 RPM and 80 mA free-run, 85 oz-in (6.1 kg-cm) and 2.2 A stall.

Pololu item #: 2286
Price: $34.95
Quantity:

This cylindrical, 2.62" x 0.98" x 0.98" brushed DC gearmotor with a 74.83:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 3592 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 75 RPM and 80 mA free-run, 85 oz-in (6.1 kg-cm) and 2.2 A stall.

Pololu item #: 1576
Price: $21.95
Quantity:

This cylindrical, 2.13" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 99:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 100 RPM and 450 mA free-run, 160 oz-in (11.5 kg-cm) and 6 A stall.

Pololu item #: 1587
Price: $19.95
Quantity:

This cylindrical, 2.13" x 0.98" x 0.98" brushed DC gearmotor with a 99:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 57 RPM and 80 mA free-run, 110 oz-in (7.9 kg-cm) and 2.2 A stall.

Pololu item #: 1577
Price: $21.95
Quantity:

This cylindrical, 2.2" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 172:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 57 RPM and 450 mA free-run, 260 oz-in (18.7 kg-cm) and 6 A stall. (Note: stall torque and current specifications are theoretical values; stalling the motor is likely to damage the gearbox.)

Pololu item #: 1588
Price: $19.95
Quantity:

This cylindrical, 2.2" x 0.98" x 0.98" brushed DC gearmotor with a 172:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available with an encoder.

Key specs at 6 V: 33 RPM and 80 mA free-run, 170 oz-in (12.2 kg-cm) and 2.2 A stall.

Pololu item #: 2288
Price: $34.95
Quantity:

This cylindrical, 2.69″ × 0.98″ × 0.98″ brushed DC gearmotor with a 171.79:1 metal gearbox is a lower-current alternative to our 25D mm HP gearmotors. It has an integrated 48 CPR quadrature encoder on the motor shaft, which corresponds to 8246 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 33 RPM and 80 mA free-run, 170 oz-in (12.2 kg-cm) and 2.2 A stall.

Pololu item #: 1589
Price: $19.95
Quantity:

This cylindrical, 2.2" x 0.98" x 0.98" brushed DC gearmotor with a 227:1 metal gearbox is a lower-current, lower-speed alternative to our 25D mm HP gearmotors. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 25 RPM and 80 mA free-run, 220 oz-in (15.8 kg-cm) and 2.2 A stall. (Note: stall torque and current specifications are theoretical values; stalling the motor is likely to damage the gearbox.)

Pololu item #: 1590
Price: $19.95
Quantity:

This cylindrical, 2.28" x 0.98" x 0.98" brushed DC gearmotor with a 378:1 metal gearbox is a lower-current , lower-speed alternative to our 25D mm HP gearmotors. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 15 RPM and 80 mA free-run, 250 oz-in (18.0 kg-cm) and 2.2 A stall. (Note: stall torque and current specifications are theoretical values; stalling the motor is likely to damage the gearbox.)

Pololu item #: 1591
Price: $19.95
Quantity:

This cylindrical, 2.28" x 0.98" x 0.98" brushed DC gearmotor with a 499:1 metal gearbox is a lower-current , lower-speed alternative to our 25D mm HP gearmotors. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 12 RPM and 80 mA free-run, 300 oz-in (21.6 kg-cm) and 2.2 A stall. (Note: stall torque and current specifications are theoretical values; stalling the motor is likely to damage the gearbox.)

Pololu item #: 2269
Price: $23.95
Quantity:

This is the motor and encoder portion of our high-power (HP) 25D mm metal gearmotors with 48 CPR encoders. It does not include a gearbox, but the pinion gear on the output shaft works with all of our 25D mm gearmotor gearboxes, so this can be used as a replacement motor or encoder for those gearboxes. It is intended for use at 6 V, though it should operate comfortably in the 3 V to 9 V range.

Key specs at 6 V: 9800 RPM and 450 mA free-run, 2 oz-in (0.1 kg-cm) and 6 A stall.

Pololu item #: 2280
Price: $21.95
Quantity:

This is the motor and encoder portion of the low-power (non-HP) versions of our 25D mm metal gearmotors with 48 CPR encoders. It does not include a gearbox, but the pinion gear on the output shaft works with all of our 25D mm gearmotor gearboxes, so this can be used as a replacement motor or encoder for those gearboxes. It is intended for use at 6 V, though it should operate comfortably in the 3 V to 9 V range.

Key specs at 6 V: 5600 RPM and 80 mA free-run, 1 oz-in (0.07 kg-cm) and 2.2 A stall.