FingerTech's Gold Spark motors are great for hobby use and in competition robots such as mini-sumo and line following.  If your application will be close to or exceeding the specified torque limits, check out our Silver Spark motors.

• The extra-long 3mm shaft is triple-supported internally so that wheels can be mounted directly.
• All-metal spur gear reduction gearhead mated to a Mabuchi FK-050 motor.
• 9 different gear ratios of 20, 35, 50, 63, 86, 115, 150, 250, and 360:1
• At only 28grams (0.99oz), these are a lightweight yet powerful motor.

These motors make it super simple to get a robot moving! Just pick up a pair of Snap Wheels and Snap Hubs to mount them, solder on a pair of tinyESCs and your motors are ready to be driven by radio control!  For mounting the motors, use 2-56 screws and our custom motor mounts.  We now also carry 3mm bearing blocks for supporting the shaft in heavy robots or weapon systems, and Flat Motor Mounts for when you want to face-mount in a panel.

Motor (Mabuchi FK-050SH-13125) Specifications Operating Voltage: 3V - 18.5V (>10V decreases motor life) Nominal Voltage: 6Vdc No Load RPM: 11530rpm No Load Current: 0.09A Stall Current: 1.3A Stall Torque: 0.0461kg-cm (0.64oz-in) Kt: 0.0352kg-cm/A (0.49oz-in/A) Kv: 1573rpm/V Peak Efficiency: 52% RPM @ Peak Eff: 9100 Current @ Peak Eff: 0.34A Click here for the motor torque, current, rpm and efficiency curve.

Physical Specifications Gearbox Length: 11.6mm (0.455in) Motor Length: 28.7mm (1.13in) Total Gearmotor Length: 40.3mm (1.59in) Gearbox Diameter: 15.5mm (0.61in) Shaft Diameter: 3mm (0.12in) with flat along length Shaft Length: 38mm (1.5in) Mounting Holes (2): #2-56 spaced 11mm (0.433in) apart -do not use screws that protrude more than 4mm (0.156in) into gearbox Weight (all ratios): 28grams (0.99oz)

Some ratio gearboxes can be interchanged because they use the same pinion gears on the motor.
20, 35, 50, 63: 18T pinions
86, 115, 150, 250: 16T pinions
360: 14T pinion
So (for example) you can remove the 50:1 ratio gearbox from its motor and replace it with a 35:1 ratio gearbox for more speed - without needing to desolder the motor!  (Might want to swap the stickers so you know what's in the robot!)
 

No Load Speed @ Gear Ratio/Voltage (Click to Enlarge) Motors have been tested to work up to 22.2V (6 lipoly cells), but don't expect the motor to run that high forever!

Maximum Torque @ Ratio/Voltage (kg-cm) (oz-in) (Click to Enlarge) Exceeding 6.84kg-cm (95oz-in) will damage the output gear stage. Do not stall the motors highlighted in red at the indicated voltage.

FingerTech_Gold_Spark_16mm_motor.IGS (all ratios)