391:1 Metal Gearmotor 20Dx46L mm 12V CB with Extended Motor Shaft

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 12V brushed DC motor with long-life carbon brushes 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 12 V: 36 RPM and 90 mA with no-load, 290 oz-in (21 kg-cm) and 1.6 A at stall. Note: the gearbox torque limit is 70 oz-in (5 kg-cm).

Specifications:

• Size: 20D × 46L mm
• Weight: 47 g
• Shaft diameter: 4 mm
• Gear ratio: 390.625:1
• Free-run speed @ 12V: 36 rpm
• Free-run current @ 12V: 90 mA
• Stall current @ 12V: 1.6 A
• Stall torque @ 12V: 21 kg-cm
• Free-run speed @ 6V: 18 rpm
• Stall current @ 6V: 0.8 A
• Stall torque @ 6V: 10.5 kg-cm
• Extended motor shaft?: Y
• Motor type: 1.6A stall @ 12V CB (carbon brush)