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Hybrid Stepper Motor Linear Actuator

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.


Force -speed performance

Screw A — 0.25″/6.35 mm travel per revolution
Screw B — 0.125″ / 3.175 mm travel per revolution
Screw C — 0.063″ / 1.588 mm travel per revolution
Test conditions

100% current with damper simulating load.


Load limits

Non-captive shaft linear actuators limit is 50 lbs / 22 kg. External shaft linear actuators limits are determined by the selected nut.

NOTE: Above performance data for maximum force/load is based on a static load and will vary with a dynamic load

Motor Characteristics

External shaft
General purpose nut
Maximum thrustlbs (kg)25 (11)
Maximum repeatabilityin (mm)0.005 (0.127)
Anti-backlash nut
Maximum thrustlbs (kg)5 (2)
Maximum repeatabilityin (mm)0.0005 (0.0127)
Phase currentamps0.75
Number of leads4
Phase resistanceohms6.1
Phase inductancemH8.3
Weight (without screw)oz (g)6.7 (190)
Step angle α°1.8

Wiring & Mechanical

Motor wiring/connectivity

11-Position Wire Crimp

11-Position Wire Crimp

Description: 0.5 mm Pitch Micro-Latch Wire-to-Board Housing, Friction Lock

Housing P/N:
Crimp Pin P/N:
Crimp Pin QTY:

Notes: Recommended Wiring AWG 26 (14 mm2). Pre-assembled accessory cable P/N PD04-14-FL.3 is available.

Pin configuration
Pin #SignalDescription
1Phase APhase A output
2N/CNot connected/used
3N/CNot connected/used
4N/CNot connected/used
5Phase /APhase A return
6N/CNot connected/used
7Phase BPhase B output
8N/CNot connected/used
9N/CNot connected/used
10N/CNot connected/used
11Phase /BPhase B return

Dimensional information

Dimensions are in inches (mm)

LM14 Motor Dimention Image

Screw specifications

Screw travel specifications

Travel per revolution
Screw G0.3759.525
Screw A0.205.08
Screw B0.1674.233
Screw D0.08332.116
Travel per full step
Screw G0.0018750.0476
Screw A0.0010.0254
Screw B0.0008350.0212
Screw D0.00041650.0106

Dimensional information

Dimensional information
in / mm
A3.0 to 18.0 / 77.5 to 455.0 in 0.1 / 0.25 increments
B0.25 / 6.35
C0.25 / 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
SmoothØ 0.1967″ ±0.001 Ø 5 mm ±0.003
Threaded Metric: M4 x 0.7mm thread to within 0.03″/ 0.76 mm of shoulderUNC: #8-32 UNC-2A thread to within 0.03″/ 0.76 mm of shoulder
Need a custom leadscrew 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

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