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172:1 Metal Gearmotor 25Dx56L mm

Vendor's Description: 

This cylindrical, 2.2" x 0.98" x 0.98" brushed DC gearmotor with a 172:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available with an encoder.Key specs at 6 V: 33 RPM and 80 mA free-run, 170 oz-in (12.2 kg-cm) and 2.2 A stall.