31:1 Metal Gearmotor 20Dx41L mm 6V CB with Extended Motor Shaft

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 31.25:1 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. This version also has a 6 × 2 mm extended motor shaft. 

Key specs at 6 V: 470 RPM and 170 mA with no load, 28 oz-in (2.0 kg-cm) and 2.9 A at stall.

Specifications:

• Size: 20D × 41L mm
• Weight: 44 g
• Shaft diameter: 4 mm
• Gear ratio: 31.25:1
• Free-run speed @ 6V: 470 rpm
• Free-run current @ 6V: 170 mA
• Stall current @ 6V: 2.9 A
• Stall torque @ 6V: 2.0 kg-cm
• Extended motor shaft?: Y
• Motor type: 2.9A stall @ 6V CB (carbon brush)