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2" (50 mm) Motorized Actuators

  • Piezo Inertia or Stepper Actuators with 50 mm of Travel
  • High Load Capacities
  • No Backlash

Application Idea

Three LNR50DD Stages
in XYZ Configuration
with DRV250 Motors


50 mm Travel
Stepper Motor Actuator


50 mm Travel
Piezo Inertia Actuator

Related Items

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Piezo Inertia Actuator with 50 mm Travel

Required Controller:
KIM001 or KIM101

  • Single- or Dual-Channel Operation
  • Standalone Control via Top Panel or PC-Control via USB Plug and Play
  • Voltage Output from 85 V to 125 V
Item # PIA50
Travel 50 mm
Typical Step Sizea 20 nm
Maximum Step Sizeb <30 nm
Step Size Adjustabilityc ≤30%
Maximum Step Frequencyd 2000 Hz
Backlash None
Maximum Axial Preloade 25 N
Recommended Maximum
Axial Load Capacityf
2.5 kg (5.51 lbs)
2 mm/min (Typical)
<3.5 mm/min (Maximum)
Drive Screw 1/4"-80 Thread, Hard PVD Coated
Motor Type Piezoelectric Inertia
Mounting Options Ø3/8" (9.52 mm) Barrel
3/8"-40 Threaded Barrel
Operating Temperature 10 to 40 °C (50 to 104 °F)
Dimensions 3.80" x 1.24" x 0.67”
(96.6 mm x 31.5 mm x 17.0 mm)
Cable Length 1.0 m (3.28')
Connector SMC, Female
Compatible Controller KIM001 or KIM101
  • This value can vary over 20% due to component variance, change of direction, and application condition.
  • This can be adjusted up to 30% in both directions using the KIM101 Controller and Kinesis Software.
  • This can be adjusted using K-Cube Piezo Inertia Controller and the Kinesis Software.
  • Using the KIM001 or KIM101 Inertia Piezo Controllers
  • The axial force applied to the drive tip to achieve the specified step size. A minimum of 5 N is recommended to enhance stepping behavior.
  • A higher maximum load is possible but it may adversely affect the typical step size.


  • Compact Design, 31.5 mm x 17.0 mm (W x H)
  • Piezo Inertia Actuator Offers 20 nm Typical Step Size
  • Manual Adjustment via Rear-Located Thumbscrew
  • 125 V Maximum Operating Voltage
  • Compatible with Translation Stages using 3/8"-40 Thread or 3/8" Mounting Block
  • Also Available in 10 mm, 13 mm, and 25 mm Travel Versions
  • Ideal for Set-and-Hold Applications that Require Relative Positioning with High Resolution
  • Control Cable can be Adjusted up to 110° for Space-Constrained Applications

Thorlabs' PIA50 Piezoelectric Inertia Actuator provides high-resolution linear motion control with a long piezo-controlled translation range in a compact package. It can support loads up to 2.5 kg (5.51 lbs) and preloads up to 30 N with typical movements of 20 nm and no backlash. The step size can be adjusted up to 30% to a maximum of approximately 30 nm using the KIM101 Controller and Kinesis® software. However, due to the open-loop design, hysteresis, and application conditions, the achieved step size of the system can vary over 20%. An external feedback system will need to be used to overcome this variance.

This actuator has a Ø3/8" (9.52 mm) mounting barrel with a 3/8"-40 thread on the front of the barrel for compatibility with our wide range of translation and rotation stages. For compatibility with 1/4"-80 threaded mirror mounts see our 10 mm travel piezo inertia actuator. The actuator is self-locking when at rest and when there is no power supplied to the piezo, making the actuator ideal for set-and-hold applications that require nanometer resolution and long-term alignment stability. Manual adjustments can be made at any time, as long as the piezo is not actively translating the screw, by using the rear-located thumbscrew or with a 5/64" (2 mm) hex key. 

Inertia Motor
Click for Details

The Control Cable Can be Adjusted up to 110° for Space-Constrained Applications

Powered by a 10 mm (0.39") long discrete piezo stack, the actuator can operate at speeds of up to 3.5 mm/min. The design of the piezo motor will rotate the tip of the lead screw during translation. As shown in the image to the right, the control cable for each actuator can be rotated up to 110° for space-constrained applications.

For information on the design of our piezo inertia "slip-stick" motor actuators, please see the complete presentation here.

Required Controller
A K-Cube Piezo Inertia Controller is required to operate our PIA50 Piezo Inertia Actuator; the actuator cannot be operated using a standard piezo controller. The K-Cube controllers have an internal sawtooth voltage signal generator capable of sending sub-millisecond pulses (steps) with controllable amplitudes from 85 V to 125 V. In addition to a single-channel driver, we offer a four-channel driver capable of single- or dual-channel operation, which is ideal for applications involving multiple motorized actuators, such as beam steering.

For more information, please see the full web presentation.

Posted Comments:
No Comments Posted
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PIA50 Support Documentation
PIA50Piezo Inertia Actuator, 50 mm Travel, Mounting: 3/8"-40 Thread and 3/8" Barrel
5-8 Days

Stepper Motor Actuator with 50 mm Travel

Recommended Controllers
BSC201, BSC202, or BSC203

  • 409,600 Microsteps per Revolution
  • 48 V Output at 25 W
  • Trapezoidal and
    'S-Curve' Velocity Profiles


  • Specifically Designed to be Used with LNR50 TravelMax™ Stages
  • ±1.6 µm Unidirectional Repeatability
  • Maximum Pushing Force: 180 N
  • Preload to Eliminate Backlash
  • Non-Rotating Tip
  • 25 mm Travel Version also Available
Key Specificationsa
Travel Range 50 mm (1.97")
Unidirectional Repeatability ±1.6 µm
Bidirectional Repeatability ±3.9 µm
Maximum Pushing Forceb 180 N
Maximum Velocity 50 mm/s
Maximum Acceleration 50 mm/s2
Limit Switches Hall Effect
Homing Repeatability ±3.6 µm
Feedback Nonec
Motor Type 2-Phase Stepper Motor
Full Step Angle 1.8°
Lead Screw Pitch 1.0 mm
Microsteps per Revolution 409 600
Actuator Mass 0.66 kg
Compatible Controllers BSC201, BSC202, BSC203,
or MST602
  • For complete specifications, see the manual.
  • The unit requires a preload in order to function properly and should be used only for pushing loads. Do not use for pulling.
  • Although feedback is not provided within the actuator, closed-loop control can be achieved by using the LNR502E(/M) stage.
3-Axis Stepper Motors
Click to Enlarge

View Imperial Product List
Item #QtyDescription
LNR50DD32" (50 mm) TravelMax Stage with Differential Drive - Imperial
DRV250350 mm Trapezoidal Stepper Motor Drive
LNR50P41Base Plate for LNR50 TravelMax Stages, Imperial
LNR50P31XY Adapter Plate for LNR50 TravelMax Stages, Imperial Hole Spacings
LNR50P21Right-Angle Bracket for LNR50 TravelMax Stages, Imperial Threads
View Metric Product List
Item #QtyDescription
LNR50DD/M350 mm (2") TravelMax Stage with Differential Drive - Metric
DRV250350 mm Trapezoidal Stepper Motor Drive
LNR50P4/M1Base Plate for LNR50 TravelMax Stages, Metric
LNR50P3/M1XY Adapter Plate for LNR50 TravelMax Stages, Metric Hole Spacings
LNR50P2/M1Right-Angle Bracket for LNR50 TravelMax Stages, Metric Threads
A 3-axis LNR50DD 2" travel stage shown with the manual adjusters replaced by DRV250 actuators.

The DRV250 offers 50 mm (1.97") of travel and a unidirectional repeatability of ±1.6 μm. When used with one of our stepper motor controllers, the DRV250 achieves a theoretical minimum step size of 2.4 nm and a maximum speed of 50 mm/s.

The hybrid stepper motor, with its rotor that consists of 50 individual magnetic teeth, is ideally suited for micro-stepping applications. Aside from the increase in resolution resulting from increasing the steps per revolution from 200 to 409 600, micro-stepping also ensures smoother low-speed motion by allowing the discrete 1.8° step size to be reduced to much smaller steps, resulting in lower vibrational noise.

The DRV250 stepper motor drive is equipped with a trapezoidal screw thread for more efficient high-load operation than is available from a standard threading.

This actuator is compatible with our 2" TravelMax Manual Stages. To use the DRV250 with these stages, mount the motor to the side of the stage using two 40 mm long M4 cap screws (included). In order to secure the TravelMax stage to a table while using the DRV250 actuator, the LNR50P4(/M) base plate is required.

Pin Diagram

High-Density D-Type Male 15 Pin Connector

15-Pin D-Sub Connector Pin Out

Pin Description Pin Description
1 Limit Grounda 9 Ident (for Future Use)
2 CCW Limit Switch 10 +5 V
3 CW Limit Switch 11 Reserved for Future Use
4 Motor Phase B- 12 Reserved for Future Use
5 Motor Phase B+ 13 +5 V
6 Motor Phase A- 14 Reserved for Future Use
7 Motor Phase A+ 15 Ground
8 Reserved for Future Use  -  -
  • The limit switch ground wire is connected to the motor body.
Connectors Terminating the Converter Cable
Click to Enlarge

High-Density D-Type Male 15 Pin Connector

Posted Comments:
wmwu  (posted 2016-02-29 19:00:04.997)
Dear Officer, Is "Stepper Motor Drive (DRV014)" able to connect to the "Translation Stage(PT1A)", and to control its motion? Thanks very much. Best regards, Alan
bwood  (posted 2016-03-01 04:06:43.0)
Response from Ben at Thorlabs: Thank you for your feedback. Unfortunately, the DRV014 is not compatible with the PT1A. Among other reasons, the DRV014 barrel size is too large (Ø12 mm) for the PT1A (Ø9.5 mm). The recommended stage to pair with the DRV014 are the 50 mm TravelMax™ stages, and the recommended actuators for the PT1A can be found under the "Actuator" tab on the PT1 series web page.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
DRV250 Support Documentation
DRV25050 mm Trapezoidal Stepper Motor Drive
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