Fingertech N20 Mini Spark Gearmotor

FINGERTECH N20 MINI SPARK GEARMOTOR

FingerTech N20 Mini Spark gearmotors are compact, high-power mini gearmotors designed for 150g fairyweight robots, plastic ants, and other weight-constrained builds. Built in a GM12-compatible form factor, they share the same gearbox dimensions and 3mm D-flat shaft used by common 12mm gearboxes, allowing drop-in use with existing mounts and press-on wheels. A custom steel faceplate improves mounting thread strength, and the motor is optimized for typical 2S operation, delivering strong performance at 7.4V. These motors are also used in select ultra-light plastic ant designs where size, weight, and simplicity are critical.

$11.50

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The FingerTech N20 Mini Spark gearmotor is a purpose-built mini drivetrain motor developed in collaboration with Canadian combat robotics manufacturer CASFAB. Designed with weight- and space-constrained robots in mind, these motors are optimized for 150g fairyweight builds while remaining useful in other ultra-compact applications where efficiency and simplicity matter.

With the Mini Spark lineup, FingerTech expands into the popular N-series mini gearmotor form factor, bringing their design philosophy and combat-focused refinements to a size class already familiar to many builders.

The Mini Spark uses a GM12-compatible gearbox footprint, sharing the same 12mm-class dimensions and 3mm D-flat output shaft as many common mini gearmotors. This allows builders to reuse existing mounts, press-on wheels, and hub solutions without redesigning their drivetrain. The gearbox is paired with a custom steel faceplate that increases mounting thread strength while remaining lightweight—an important upgrade for robots that see repeated impacts and rebuilds.

Electrically, the N20 Mini Spark is designed to run comfortably on typical 2S (7.4V) systems, with a wide operating voltage range from 3V–9V. Compared to standard low-power N20 motors, the Mini Spark offers significantly higher current capability, making it well-suited for aggressive fairyweight drivetrains and other compact robots that demand more torque than traditional mini motors can provide.

Multiple gear ratios are available, allowing builders to balance speed and torque depending on arena size, driving style, and robot weight. Lower ratios favor speed and agility, while higher ratios trade top speed for pushing power and control. As with all mini gearmotors, proper gearing, wheel size, and current management are essential for reliability.

The FingerTech N20 Mini Spark pairs naturally with FingerTech Lightweight Twist Hubs and compatible press-on wheels, making it easy to assemble a compact, serviceable drivetrain with minimal added mass. For builders looking to extract maximum performance from a tiny package, the Mini Spark offers a proven foundation.

A note on nomenclature: Many industry sources call any N-series gearmotor a “micro gearmotor.” Fingertech has branded their N10’s as “Micro Sparks” and their N20’s as “Mini Sparks”. So technically, a Mini Spark could also be called a “micro gearmotor” based on common usage.

Combat-optimized N20 mini gearmotor developed with Canadian manufacturers Fingertech and CASFAB for 150g fairyweight and plastic Antweight robots.
GM12-compatible footprint with the same gearbox dimensions and 3mm D-flat shaft as common 12mm-class mini gearmotors.
Drop-in compatibility with existing mounting solutions and press-on wheel setups.
Custom steel faceplate improves mounting thread strength while remaining lightweight.
2S voltage range (3V–9V) with a nominal 6V rating and commonly run at 7.4V.
High-power performance with stall current ratings of 0.85A @ 6V and 1.05A @ 7.4V.
Multiple ratios available (20:1, 30:1, 50:1) to balance speed and torque for your build.

Specification	Value
Motor Type	Brushed DC Mini Gearmotor (N20)
Operating Voltage	3V–9V
Nominal Voltage	6V (commonly run at 7.4V)
Stall Current	2.0A @ 6V 2.47A @ 7.4V
Peak Efficiency	44%
Gear Ratios Available	20:1, 30:1, 50:1
No-Load Speed @ 7.4V	20:1 – 1819rpm 30:1 – 1215rpm 50:1 – 728rpm
Stall Torque @ 7.4V	20:1 – 0.74kg-cm (10.28oz-in) 30:1 – 1.09kg-cm (15.14oz-in) 50:1 – 1.68kg-cm (23.33oz-in)
Gearbox Size	12×10mm
Gearbox Length	9.1mm
Motor Length	16mm
Shaft Diameter	3mm D-flat
Shaft Length	10mm
Mounting Holes	2 × M1.6, 9mm spacing
Weight	9.7g (0.34oz)

What weight classes are these motors intended for?

The FingerTech N20 Mini Spark gearmotors are designed for 150g fairyweight combat robots. Some builders may also use N-series motors in other lightweight applications like plastic ants, depending on rules and design constraints.

What voltage should I run these motors at?

These motors operate from 3V–9V. They are nominally rated at 6V and are commonly run on 2S LiPo batteries (7.4V).

Are these compatible with standard N20 / GM12 mounting hardware?

Yes. Mini Spark gearmotors share the same gearbox dimensions and 3mm D-flat shaft as common GM12-style gearmotors, allowing use of existing mounts and press-on wheels.

What makes these different from typical N20 motors?

These motors feature a custom steel faceplate for improved mounting thread strength and are optimized for combat robotics use, with higher current capability than typical hobby N20 gearmotors.

Do these work with FingerTech wheels and hubs?

Yes. These motors pair directly with FingerTech Lightweight Twist Hubs and Thin Foam Wheels designed for 3mm D-flat shafts.

I see this class of motors called "Micro Gearmotors" elsewhere, but Fingertech calls their N20s "Mini Sparks" and their N10s "Micro Sparks". I'm confused, which is correct?

They both are. Many industry sources call any N-series gearmotor a "micro gearmotor." Fingertech has branded their N10's as "Micro Sparks" and their N20's as "Mini Sparks". So technically, a Mini Spark could also be called a "micro gearmotor" based on common usage. Think of one term as a common description, and the other term as Fingertech's brand name for their N20's.