12mm 3V 6V 12V Gearmotor w/Encoder Screw Shaft NFP-GM12-N20V-EN-M4

55mm Shaft DC Gear Motor with Dust Cover Datasheet

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First, the NFP-GM12-N20V-EN-M4 is a small DC gear motor with a 55mm threaded shaft, dust cover, and magnetic Hall encoder.

Also, the motor is available in 3V, 6V, and 12V versions. Therefore, users can choose the voltage that best fits the power source.

In addition, several gear ratios are available. As a result, the motor can provide either higher speed or higher torque.

Main Features

• First, long threaded shaft: The M4 × 0.5 shaft is 55mm long.
• Also, dust cover: The cover helps protect the gearbox from dust and small particles.
• In addition, Hall encoder: The encoder provides AB phase speed and position signals.
• Moreover, several voltages: Choose 3V, 6V, or 12V DC.
• Also, wide speed range: No-load speed ranges from 20rpm to 2,200rpm.
• Furthermore, reverse rotation: The motor supports CW and CCW rotation.
• Finally, easy mounting: The long shaft can be used with wheels, couplings, nuts, and other drive parts.

General Motor Data

Next, use the table below to check shaft size, voltage, speed, current, rotation, and weight.

Model	NFP-GM12-N20V-EN-M4
Shaft Diameter	M4 × 0.5 Standard Threaded Shaft
Shaft Length	55mm
Voltage	3V / 6V / 12V DC
No-load Speed	20rpm – 2,200rpm
No-load Current	≤0.045A / ≤0.06A
Rotation	CW / CCW
Weight	Approx. 17g

NFP-GM12-N20V-EN-M4 3V A06 Type Performance

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First, this 3V A06 Type is a low-current option. Therefore, it works well in compact battery-powered systems.

Also, lower ratios give more speed. In contrast, higher ratios give lower speed and more torque.

Ratio	Output Pulses	No-load Current	No-load Speed	Rated Current	Rated Speed	Rated Torque	Stall Current	Stall Torque
10:1	67.76	≤0.045A	780rpm	≤0.1A	450rpm	0.03kg.cm	0.3A	0.08kg.cm
20:1	135.5	≤0.045A	400rpm	≤0.1A	230rpm	0.06kg.cm	0.3A	0.16kg.cm
30:1	206.3	≤0.045A	265rpm	≤0.1A	150rpm	0.1kg.cm	0.3A	0.23kg.cm
50:1	357.7	≤0.045A	155rpm	≤0.1A	90rpm	0.17kg.cm	0.3A	0.4kg.cm
100:1	695.1	≤0.045A	77rpm	≤0.1A	45rpm	0.35kg.cm	0.3A	0.75kg.cm
150:1	1,056.7	≤0.045A	52rpm	≤0.1A	30rpm	0.5kg.cm	0.3A	1.1kg.cm
210:1	1,468.3	≤0.045A	37rpm	≤0.1A	21rpm	0.7kg.cm	0.3A	1.5kg.cm
298:1	2,085.3	≤0.045A	26rpm	≤0.1A	15rpm	1kg.cm	0.3A	2.8kg.cm
380:1	2,654.1	≤0.045A	20rpm	≤0.1A	12rpm	1.2kg.cm	0.3A	3.5kg.cm

Note: All reduced no-load speeds have a tolerance of ±15%.

For example, the 10:1 ratio gives 780rpm at no load. However, the 380:1 ratio lowers the speed to 20rpm and gives much more torque.

NFP-GM12-N20V-EN-M4 6V A06 Type Performance

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Next, the 6V A06 Type provides more speed and torque than the 3V A06 Type. Therefore, it is useful when stronger output is needed.

Also, the Hall encoder gives more output pulses as the gear ratio rises. As a result, higher ratios provide finer output position data.

Ratio	Output Pulses	No-load Current	No-load Speed	Rated Current	Rated Speed	Rated Torque	Stall Current	Stall Torque
10:1	67.76	≤0.06A	1,550rpm	≤0.17A	900rpm	0.07kg.cm	0.6A	0.16kg.cm
20:1	135.5	≤0.06A	800rpm	≤0.17A	460rpm	0.14kg.cm	0.6A	0.3kg.cm
30:1	206.3	≤0.06A	530rpm	≤0.17A	300rpm	0.2kg.cm	0.6A	0.5kg.cm
50:1	357.7	≤0.06A	310rpm	≤0.17A	180rpm	0.35kg.cm	0.6A	0.8kg.cm
100:1	695.1	≤0.06A	155rpm	≤0.17A	90rpm	0.7kg.cm	0.6A	1.5kg.cm
150:1	1,056.7	≤0.06A	105rpm	≤0.17A	60rpm	1kg.cm	0.6A	2.2kg.cm
210:1	1,468.3	≤0.06A	75rpm	≤0.17A	42rpm	1.4kg.cm	0.6A	2.8kg.cm
298:1	2,085.3	≤0.06A	52rpm	≤0.17A	30rpm	2kg.cm	0.6A	3kg.cm
380:1	2,654.1	≤0.06A	41rpm	≤0.17A	24rpm	2.5kg.cm	0.6A	4kg.cm

Note: All reduced no-load speeds have a tolerance of ±15%.

NFP-GM12-N20V-EN-M4 6V A12 Type Performance

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Also, the 6V A12 Type uses less current than the 6V A06 Type. Therefore, it is useful when lower current is more important than maximum speed.

In addition, several ratios are available. As a result, users can select a good balance of speed, torque, and encoder count.

Ratio	Output Pulses	No-load Current	No-load Speed	Rated Current	Rated Speed	Rated Torque	Stall Current	Stall Torque
10:1	67.76	≤0.045A	1,100rpm	≤0.1A	700rpm	0.05kg.cm	0.2A	0.07kg.cm
20:1	135.5	≤0.045A	500rpm	≤0.1A	350rpm	0.09kg.cm	0.2A	0.12kg.cm
30:1	206.3	≤0.045A	330rpm	≤0.1A	200rpm	0.12kg.cm	0.2A	0.2kg.cm
50:1	357.7	≤0.045A	200rpm	≤0.1A	120rpm	0.2kg.cm	0.2A	0.32kg.cm
100:1	695.1	≤0.045A	100rpm	≤0.1A	65rpm	0.4kg.cm	0.2A	0.7kg.cm
150:1	1,056.7	≤0.045A	65rpm	≤0.1A	45rpm	0.6kg.cm	0.2A	0.9kg.cm
210:1	1,468.3	≤0.045A	47rpm	≤0.1A	30rpm	0.8kg.cm	0.2A	1.2kg.cm
298:1	2,085.3	≤0.045A	33rpm	≤0.1A	20rpm	1.15kg.cm	0.2A	1.5kg.cm
380:1	2,654.1	≤0.045A	26rpm	≤0.1A	17rpm	1.5kg.cm	0.2A	2kg.cm

Note: All reduced no-load speeds have a tolerance of ±15%.

NFP-GM12-N20V-EN-M4 12V A12 Type Performance

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Finally, the 12V A12 Type gives the highest speed in this group. Therefore, it works well when both speed and encoder feedback are needed.

Also, higher ratios provide strong torque. In contrast, lower ratios provide much higher output speed.

Ratio	Output Pulses	No-load Current	No-load Speed	Rated Current	Rated Speed	Rated Torque	Stall Current	Stall Torque
10:1	67.76	≤0.06A	2,200rpm	≤0.22A	1,000rpm	0.1kg.cm	0.4A	0.15kg.cm
20:1	135.5	≤0.06A	1,100rpm	≤0.22A	500rpm	0.15kg.cm	0.4A	0.28kg.cm
30:1	206.3	≤0.06A	730rpm	≤0.22A	380rpm	0.2kg.cm	0.4A	0.4kg.cm
50:1	357.7	≤0.06A	440rpm	≤0.22A	230rpm	0.4kg.cm	0.4A	0.65kg.cm
100:1	695.1	≤0.06A	220rpm	≤0.22A	130rpm	0.8kg.cm	0.4A	1.3kg.cm
150:1	1,056.7	≤0.06A	145rpm	≤0.22A	85rpm	1.2kg.cm	0.4A	1.9kg.cm
210:1	1,468.3	≤0.06A	105rpm	≤0.22A	60rpm	1.6kg.cm	0.4A	2.5kg.cm
298:1	2,085.3	≤0.06A	73rpm	≤0.22A	42rpm	2.3kg.cm	0.4A	3kg.cm
380:1	2,654.1	≤0.06A	58rpm	≤0.22A	34rpm	3kg.cm	0.4A	4kg.cm

Note: All reduced no-load speeds have a tolerance of ±15%.

N20 Speed Reduction Gearbox Motor Dimension

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First, the 55mm threaded shaft gives more room for nuts, couplings, wheels, and other drive parts. Therefore, it is useful in custom robot and actuator builds.

Also, the M4 threaded shaft can make mounting easier. As a result, users can secure driven parts with a matching nut or coupling.

In addition, the gearbox offers both speed and torque options. Therefore, the same motor family can fit many small drive systems.

• First, RC projects: The motor can drive wheels and small moving parts.
• Also, robots: The long shaft can support wheel and linkage mounts.
• In addition, actuators: The threaded shaft can be used in simple screw-drive systems.
• Finally, custom machines: Many voltage and ratio choices make setup easier.

Magnetic Hall Encoder Wiring Diagram

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Next, the built-in magnetic Hall encoder provides AB phase pulse signals. Therefore, a controller can read motor speed, rotation direction, and shaft movement.

Also, the encoder includes pull-up shaping resistors. As a result, it can connect directly to many MCU inputs.

Encoder Data

Encoder Type	AB Dual-phase Incremental Magnetic Hall Encoder
Output Pulses	Base Pulse 7 PPR × Gear Reduction Ratio
Supply Voltage	3.3V / 5.0V DC
Basic Function	Built-in Pull-up Shaping Resistor, Direct Connection to MCU
Interface Type	ZH1.5-6PIN (Standard Connection Cable)
Output Signal	Square Wave AB Phase
Response Frequency	100kHz
Base Pulse Count	7 PPR
Magnetic Ring Pole Count	14 Poles (7 Pairs)

Why Choose This Mini DC Gear Motor?

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• First, encoder feedback: The AB Hall encoder helps track speed and direction.
• Also, long shaft: The 55mm M4 threaded shaft supports many mounting methods.
• In addition, many ratios: Choose higher speed or higher torque.
• Moreover, several voltages: 3V, 6V, and 12V versions are available.
• Also, small size: The motor fits compact robots and devices.
• Furthermore, low current: Several versions work well with small power sources.
• Finally, long service life: The gearbox and bearing setup are made for steady use.

How to Choose the Right Version

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First, choose 3V, 6V, or 12V based on the power source. Next, compare the A06 and A12 motor types.

Also, use a lower ratio when you need more speed. In contrast, use a higher ratio when you need more torque and more encoder counts per output turn.

Moreover, compare rated torque with the normal working load. Therefore, the motor does not need to work too close to stall.

In addition, check stall current before choosing the driver and power supply. As a result, the system can handle startup and short overloads more safely.

Finally, make sure the 55mm M4 threaded shaft fits the final mount and driven part.

Selection Notes

• First, check voltage: Choose 3V, 6V, or 12V.
• Next, check speed: Match output RPM to the system.
• Also, check torque: Make sure rated torque is high enough.
• Moreover, check encoder count: Higher ratios give more output pulses per shaft turn.
• In addition, check current: Use a power source that can supply the motor under load.
• Then, check the shaft: Make sure the M4 × 0.5, 55mm shaft fits the design.
• Finally, test the full system: Check speed, torque, current, encoder signals, heat, and noise before mass production.

In short, the NFP-GM12-N20V-EN-M4 combines a small N20 gear motor, 55mm threaded shaft, dust cover, and AB magnetic Hall encoder.

Therefore, it is a good choice for robots, smart devices, small actuators, RC projects, small machines, and other compact closed-loop drive systems.

Keywords: N20 gear motor, 12V gear motor, DC motor with encoder, N20 encoder motor, 55mm threaded shaft gear motor, M4 shaft DC motor, magnetic Hall encoder motor, micro DC gear motor, N20 gear motor with dust cover, small DC motor with gearbox