NEMA 17 Stepper motor

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A NEMA 17 stepper motor is a stepper motor with a 1.7 x 1.7 inch (43.2 x 43.2 mm) faceplate. The NEMA 17 is larger and generally heavier than for example a NEMA 14, but this also means it has more room to put a higher torque. However, its size is not an indication of its power.


Below is a non-exhaustive list of possible motors and suppliers.

You are welcome to add information on a stepper motor/vendor you encounter, but please add only steppers which were tested to actually work on some printer.

Manufacturer Model Holding torque Rated voltage Shaft Step angle Motor length Additional notes Vendor (shipping location)
Kysan 42BYGH4803 (SKU 1124030) 54.0 N·cm 4.2 V Ø 5 mm single 1.8° 48 mm   Kysan (CN)

XYZPrinters (NL)

Kysan 42BYGH4803-DC (SKU 1124090) 54.0 N·cm 4.2 V Ø 5 mm single 1.8° 48 mm Same as 42BYGH4803, but with flat on the shaft. 3D Maker World (US)

Ultibots (US)

Rebranded Longs Motor ? 17HS1011-20B 28.0 N·cm 4.8 V Ø 5 mm single 1.8° 34 mm Also with flat on the shaft available. RobotDigg (CN)
Rebranded Longs Motor ? 17HS3001-20B 40.0 N·cm 2.0 V Ø 5 mm single 1.8° 40 mm Also with flat on the shaft available. RobotDigg (CN)
Longs Motor 17HS4417 40.0 N·cm 2.6 V Ø 5 mm single 1.8° 40 mm   2PrintBeta (DE)

Charlie's 3D Technologies (BE)

Mercury Motor SM-42BYG011-25 23.0 N·cm 12 V Ø 5 mm single 1.8° 34 mm Rated voltage higher than ideal for running on 12 V current chopping drivers. Abra (US & CA)

Akizuki Denshi Tsusho (JP)
Australian Robotics (AU)
Cool Components (UK)
MindKits (NZ)
Robot Gear (AU)
SparkFun (US)

Unknown 17HD2038E 45.0 N·cm   Ø 5 mm single 1.8°     EckerTech (CA)
Unknown 17HS19-1684S 55 N·cm 2.8 V Ø 5 mm single 1.8° 47 mm Custom model, includes 100cm leads and molex plug. Reprap Austria (AT)
SOYO SY42STH47-1206A 31.1 N·cm 4.0 V Ø 5 mm single 1.8° 40 mm   Pololu (US)

Watterott (DE)
Zapp (UK)

SOYO SY42STH47-1504A 55.0 N·cm 2.8 V Ø 5 mm 1.8° 47 mm Flat on the shaft. LulzBot (US)
SOYO SY42STH47-1684A 43.1 N·cm 2.8 V Ø 5 mm single 1.8° 48 mm Some vendors have longer than standard cables. 3Distributed (CH)
LDO Motors (CN)
Paoparts (FR)
Zapp (UK)

SOYO SY42STH47-1684B 43.1 N·cm 2.8 V Ø 5 mm double 1.8° 48 mm Same as SY42STH47-1684A, but double shaft. LDO Motors (CN)

Mendel-Parts (NL)
Zapp (UK)

Trinamic QSH4218-51-049 49 N·cm   Ø 5 mm 1.8° 47 mm Tested on MakerBot Cupcake CNC Reichelt (DE)
Wantai 42BYGH W811 47.0 N·cm 3.1 V Ø 5 mm 1.8° 48 mm Variant with flat on the shaft available. Cubic-Print (DE)

electronic-things (DE)
Phidgets (US)
RepRap teile (DE)
ReprapWorld (NL)

Wantai Custom for QU-BD 49.0 N·cm 3.6 V Ø 5 mm single 1.8° 48 mm   QU-BD (US)
Unknown Unknown 32.4 N·cm   Ø 5 mm single 0.9° 43 mm   MatterHackers (US)

These were listed as "not tested" earlier, so your mileage may vary:

Manufacturer Model Holding torque Rated voltage Shaft Step angle Motor length Additional notes Vendor (shipping location)
Lin Engineering 417-11-48-02 7.0 N·cm   Ø 5 mm 1.8° 28 mm May be too weak. Alltronics (US)
Lin Engineering 4018X-07-04 11.0 N·cm   Ø 5 mm 1.8° 26 mm May be too weak.  
Lin Engineering 4118L-25P-07R0 48.5 N·cm   Ø 5 mm 1.8° 48 mm   Alltronics (US)
Nidec Servo KH4248-B95101 48 N·cm   Ø 5 mm single 1.8° 48 mm   Mechapro (DE)
Oriental Motors PX243M-03AA 20.0 N·cm   single 0.9° 42 mm   Interinar Electronics LLC (US)
Oriental Motors PX243M-01AA 15.0 N·cm   Ø 5 mm single 0.9° 33 mm Not strong enough for direct drive extruder.
Uses Imperial #4-40 TPI mounting holes instead of M3 metric.
(Web page says no longer available; suggests RepRap builders use PX243M-03AA instead.)
Interinar Electronics LLC (US)
Oriental Motors PKE245DA-L 1555.0 N·cm   Ø 5 mm single 1.8° 47 mm Made in Japan. Oriental motor (JP/US)
Rugao Xinhe 17H185H-04A 43.8 N·cm 2.8 V Ø 5 mm single 1.8° 42 mm   AusXmods (AU)
Rugao Xinhe 17H185H-04B 43.8 N·cm 2.8 V Ø 5 mm double 1.8° 42 mm   AusXmods (AU)
SANYO DENKI (Japan) KH42KM2R001 45 N·cm   Ø 5 mm        
Custom 42BYGH404 31 N·cm   Ø 5 mm single 1.8° 49 mm   MPJA (US)

Shinano Kenshi

If you have a Shinano Kenshi motor in your hands, you can decode the part number written on it with the SKC Stepping Motor Part Number decoder at Shinano Kenshi: "Stepping Motor Operation & Theory".

Lin Engineering

Lin Engineering is one of the few manufacturers that make stepper motors in the US. If you have one of their motors in your hands, you can decode the part number written on it with the "Lin part number system" decoder on p.1 and p.2 of the Lin Engineering Catalog. Page 9 of the Lin Engineering catalog explains the part numbering system for all Lin Engineering stepper motors.


Lin Engineering 4118S-62-07

This is an awesome little NEMA 17 stepper motor. It is the primary motor used on the Cupcake CNC. It has good torque and a small size.

  • 200 steps per revolution (1.8 deg/step)
  • 2.5 A/phase
  • Phase resistance: 0.6 Ω
  • Phase inductance: 0.93 mH
  • Holding torque: 3240 g·cm (~31 N·cm)
  • Shaft diameter: 0.190" (4.83 mm)
  • Shaft length: 0.50" (12.7 mm)
  • Motor depth: 1.34" (34 mm)
  • Datasheet
Name Pololu pin Color
A 2B Red
B 2A Blue
C 1A Green
D 1B Black

External References