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Hybrid Stepper Motor Linear Actuator

LM14 NEMA 14 0.75 A 1.8° Non-captive Linear Stepper Motor

NEMA 14 (36 mm) 0.75 A, 1.8° non-captive linear actuator stepper motor delivering a maximum thrust of up to 50 lbs (22 kg)


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

Non-captive shaft
General purpose nut
Maximum thrustlbs (kg)50 (22)
Maximum repeatabilityin (mm)0.005 (0.127)
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

The nut is located internal to the motor. Max Thrust: 200 lbs (91kg)[/wpv-conditional]
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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