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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 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. 

Key specs at 12 V: 450 RPM and 90 mA with no-load, 4.2 kg-cm and 1.6 A at stall. 

Specifications:

  • Size: 20D × 43L mm
  • Weight: 45 g
  • Shaft diameter:4 mm
  • Gear ratio: 31.25:1
  • Free-run speed @ 12V: 450 rpm
  • Free-run current @ 12V: 90 mA
  • Stall current @ 12V: 1.6 A
  • Stall torque @ 12V: 2.4 kg-cm
  • Free-run speed @ 6V: 225 rpm
  • Stall current @ 6V: 0.8 A
  • Stall torque @ 6V: 1.2 kg-cm
  • Extended motor shaft?: N
  • Motor type: 1.6A stall @ 12V CB (carbon brush)