391:1 Metal Gearmotor 20Dx46L mm 6V 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 combined with a 390.6:1 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: 37 RPM and 170 mA with no load, 19 kg-cm and 2.9 A at stall. Note: the gearbox torque limit is 5 kg-cm.

Specifications:

• Size: 20D × 46L mm
• Weight: 46 g
• Shaft diameter: 4 mm
• Gear ratio: 390.625:1
• Free-run speed @ 6V: 37 rpm
• Free-run current @ 6V: 170 mA
• Stall current @ 6V: 2.9 A
• Stall torque @ 6V: 19 kg-cm
• Extended motor shaft?: Y
• Motor type: 2.9A stall @ 6V