LM14 NEMA 14 0.75 A 1.8° External Linear Stepper Motor

Hybrid Stepper Motor

LM14 NEMA 14 0.75 A 1.8° External Linear Stepper Motor

NEMA 14 (36 mm) 0.75 A, 1.8° external linear actuator stepper motor delivering a maximum thrust of up to 25 lbs (11 kg) with general purpose nut.

Our linear motors feature precision rolled lead screws which are designed specifically for motion control applications to deliver maximum life and quiet operation. Corrosion resistant and non-magnetic, screws are manufactured from premium grade stainless steel. Screws may optionally be ordered with Teflon coating.

Mechanical nut options include a general purpose nut, for applications not requiring backlash and wear compensation, and an anti-backlash nut, for high accuracy and low drag torque. Note that use of an anti-backlash nut greatly reduces the maximum force which may be applied to a load.

Motor Performance

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Spec Notes Value
External shaft
General purpose nut
Maximum thrust lbs (kg) 25 (11)
Maximum repeatability in (mm) 0.005 (0.127)
Anti-backlash nut
Maximum thrust lbs (kg) 5 (2)
Maximum repeatability in (mm) 0.0005 (0.0127)
Phase current amps 0.75
Number of leads 4
Phase resistance ohms 6.1
Phase inductance mH 8.3
Weight (without screw) oz (g) 6.7 (190)
Step angle α ° 1.8

Mechanical dimensions

dimensions in inches (mm)
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Prototype cable:
SEM PN: PD04-14-FL 3
Length: 12" (0.3 m)

Mating Connector:(if building own cables)
JST Crimp Housing: JST P/N ZHR-11, Single Row, 11-Pin
(4X) JST Crimp Contacts: JST P/N SZH-002T-P0.5

Pin # Wire Color Phase
1 Black Phase A
5 Green Phase A Return
7 Red Phase B
11 Blue Phase B Return

Screw travel specifications

Travel per revolution
Screw inches mm
Screw A 0.25 6.35
Screw B 0.125 3.175
Screw C 0.063 1.588
Travel per full step
Screw inches mm
Screw A 0.00125 0.0317
Screw B 0.00063 0.0158
Screw C 0.00031 0.0079

Dimensional information

Dimensional information
in / mm
A 3.0 to 18.0 / 77.5 to 455.0
in 0.1 / 0.25 increments
B 0.25 / 6.35
C 0.25 / 6.35

Nut specifications

General purpose nut

For applications not requiring backlash and wear compensation. Round flange shape.

Max Thrust: 25 lbs (11 kg)

General Purpose Nut

Anti-backlash nut

For applications requiring backlash-free operation for high accuracy and low drag torque. Triangle flange shape.

Factory-preloaded: The anti-backlash nut ships pre-loaded from the factory. Should you need to remove it please read the assembly instructions.

Max Thrust: 5 lbs (2 kg)

End treatment options

End treatments
Smooth Ø 0.1967″ ±0.001
Ø 5 mm ±0.003
Threaded  Metric: M4 x 0.7mm
thread to within 0.03″/
0.76 mm of shoulder
UNC: #8-32 UNC-2A thread
to within 0.03″/
0.76 mm of shoulder

Need a custom screw solution?

Custom screw ends

SEM offers numerous customization options for your lead screw. Contact us to learn more!

Leadscrew maintenance statement

While under optimal conditions lubrication interval is expected to occur approximately once every 1000 hours of service. Actual life will depend on application and environment. Based upon this, frequent inspections must be performed and a maintenance interval determined based on actual conditions.

Recommended lubricant: Dupont Krytox GPL 206

Part Number:

Select from the available options to build a part number.

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