78:1 Metal Gearmotor 20Dx43L mm 6V CB

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor with long-life carbon brushes combined with a 78.13:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 190 RPM and 170 mA with no load, 62 oz-in (4.5 kg-cm) and 2.9 A at stall. Note: the gearbox torque limit is 70 oz-in (5 kg-cm).

Specifications:

• Size: 20D × 43L mm
• Weight: 45 g
• Shaft diameter: 4 mm
• Gear ratio: 78.125:1
• Free-run speed @ 6V: 190 rpm
• Free-run current @ 6V: 170 mA
• Stall current @ 6V: 2.9 A
• Stall torque @ 6V: 4.5 kg-cm
• Extended motor shaft?: N
• Motor type: 2.9A stall @ 6V CB (carbon brush)