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
• 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)
Peak Efficiency: 52%
RPM @ Peak Eff: 9100
Current @ Peak Eff: 0.34A
Click here for the motor torque, current, rpm and efficiency curve.
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.