Miniature, 6V brush DC motor with metal gear and 15.25:1 gear ratio. It has a cross section of 10 × 12 mm, and the D-shaped output shaft with a length of 9 mm and a diameter of 3 mm. Pololu 4785

Pololu - 1524

This two-part aluminum assembly mounts directly to 5 mm diameter motor output shafts like those on many of our stepper motors and allows you to drive most scooter, skateboard, inline skate, and other common wheels that are compatible with popular 608 ball bearings.

15:1 Micro Metal Gearmotor HP with Extended Motor Shaft

15:1 Micro Metal Gearmotor. Pololu 4780

This tiny, cylindrical gearmotor consists of a coreless brushed DC motor and a 700:1 plastic planetary gearbox. The entire assembly has a diameter of just 6 mm (0.24″) and an extremely light weight of 1.3 g (0.046 oz), making it a great actuator for miniature robots and very small mechanisms.

Small metal gear motor, rotation speed 381 RPM, operating voltage 6 V. GA1024-N20F-0038

Heatsink for NEMA17 stepper motor. Mounted on M3 screws. Dimensions: 40x40x11mm

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 8 mm diameter motor shafts. The set includes two hubs, four M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), rated voltage of 3.8 V, and has a current consumption of 0.67 A per coil. Pololu 1205

Small motor with metal gear and encoder, rotation speed 150 RPM, operating voltage 6 V. GA46-N20E-0046

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 297.92:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.

A set of two black plastic brackets for mounting micro Pololu motors. Mounting screws and nuts are included. Pololu 989

298:1 Micro Metal Gearmotor with Extended Motor Shaft

DC motor equipped with a gear ratio 120: 1, powered by 6V with a torque of 0.8 kg * cm (0.08 Nm). The current consumed by the unloaded motor is about 170mA, while the maximum current drawn under load is 2.8A. It has an integrated quadrature encoder. DFRobot FIT0450

A 10-pack of adapter boards with 2-pin JST SH-type back-entry connectors for Pololu single-shaft micro metal gearmotors. Enables easy, quick, and clean wiring in compact electronic and robotic projects. Pololu 5097

AB two-phase pulse wave, measured by two infrared reflective sensor. These two sensor pulse waveform is close to a phase difference of 90 degrees, through the AB two-phase lead and lag of the waveform judged wheel forward rotation or the reverse. SEN0116

Fan module with DC motor, propeller and connection cable. DFRobot DFR0332

Add quadrature encoders to your 20D mm metal gearmotors (extended back shaft version required) with this kit that uses a magnetic disc and Hall effect sensors to provide 20 counts per revolution of the motor shaft. The sensors operate from 2.7 V to 18 V and provide digital outputs that can be connected directly to a microcontroller or other digital circuit.

Motor with 37 mm diameter and 65 mm length, 10:1 metal gear, 12 V operating voltage, 0,2 A to 5,5 A power consumption, 1000 RPM speed, 4,9 maximum torque and 64 CPR encoder. Pololu 4758