This gearmotor consists of a low-power, 6 V brushed DC motor combined with a 4.4:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. At 6V, the speed is 6,000 rpm before the motor decelerates.

Warning: Do not screw too far into the mounting holes as the screws can hit the gears. CQRobot recommend screwing no further than 6 mm (0.24″) into the screw hole.

Wiki: http://www.cqrobot.wiki/index.php/DC_Gearmotor_SKU:_CQR25D

SPECIFICATION

• Gear Ratio: 4.4:1;
• Max Power: 3 W;
• No-load Speed @ 6V: 1300 rpm;
• No-load Current @ 6V: 0.25 A;
• Stall Current @ 6V: 2.4 A;
• Stall Torque @ 6V: 0.6 kg.cm (8 oz.in);
• Motor Type: 2.4A stall @ 6V (Low-power 6V);
• Operating Temperature: -20 Degree Celsius to +60 Degree Celsius;
• Motor Size: 25D * 47.8L mm; 
• Mounting Bracket Size: 28.5 mm * 27 mm * 27 mm;
• Weight: 120 g.

SHIPPING LIST

1 * 4.4:1 Metal DC Geared-Down Motor(6V/LP)

1 * Metal Mounting Bracket Kit