SP20SLA 20 mm Sliding Lead Screw Linear Actuator

Sliding Lead Screw Linear Actuator
20 mm sliding lead screw linear actuator with up to 70 N thrust, 0.3–8 mm lead options, four mechanical configurations, encoder, brake and anti-backlash options.
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Technical details

Further information

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Positioning accuracy

High torsional rigidity and constant torsional backlash over the entire gearbox service life ensure consistently high performance

Compactness

High torque density thanks to high performance and short design

Low maintenance

Highest quality standards for a long service life and extended maintenance intervals

Technical data

Compact precision linear motion

High-force linear positioning in a 20 mm actuator frame

SP20SLA combines a compact hybrid stepper motor with a sliding lead screw for controlled linear motion. Four mechanical configurations, two motor lengths and leads from 0.3 to 8 mm support compact automation and instrument mechanisms.

20 mm

Compact frame

A square 20 mm mounting envelope for space-constrained linear-motion assemblies.

Up to 70 N

Maximum thrust

Single- and double-stack options provide a practical force range for compact mechanisms.

4 types

Flexible mechanics

External-drive, through-shaft, C-type and K-type fixed-shaft constructions.

Engineering information

Technical data

20 mmFrame size
Up to 70 NMaximum thrust
0.3–8 mmLead range
27.2 / 38.1Motor length (mm)
Electrical

Motor specifications

Two motor lengths share a 0.5 A RMS phase-current rating.

Motor length Phase voltage Phase current Phase resistance Phase inductance Weight Leads
27.2 mm 2.5 V 0.5 A RMS 5.1 Ω 1.5 mH 51 g 4
38.1 mm 4.4 V 0.5 A RMS 8.8 Ω 2.7 mH 74 g 4

Insulation class B. Maximum temperature rise: 80°C. Recommended operating temperature: −20°C to +55°C.

Lead screw selection

Available leads and travel per step

Travel values are based on a 1.8° motor step.

Screw Ø (inch) Screw Ø (mm) Lead (inch) Lead (mm) Lead code Travel / 1.8° step (mm)
0.118 3 0.0197 0.5 AD 0.0025
0.128 3.24 0.0394 1 AB 0.005
0.138 3.5 0.0118 0.3 AF 0.0015
0.138 3.5 0.024 0.6096 AA 0.003
0.138 3.5 0.048 1.2192 B 0.0061
0.138 3.5 0.0787 2 G 0.01
0.138 3.5 0.096 2.4384 J 0.012192
0.138 3.5 0.1575 4 M 0.02
0.138 3.5 0.315 8 T 0.04

Winding parameters, screw length and end machining can be reviewed for the required mechanism.

K-type fixed shaft

Stroke selection

Dimension C depends on motor length L.

Dimension A Stroke B C at L=27.2 C at L=38.1
10.9 9 0 0
14.6 12.7 3.5 0
20.8 19.05 9.5 0
27.3 25.4 15.5 4.5
33.7 31.8 22.5 11.5
40 38.1 28.5 17.5
Speed conversion

Lead-specific linear speed reference

Linear speed in mm/s.

Motor speed (r/min) 30 60 90 120 180 240 300 360 480 600 720 900 1080 1200 1500
Pulse frequency (pps) 100 200 300 400 600 800 1000 1200 1600 2000 2400 3000 3600 4000 5000
AD / 0.5 0.25 0.5 0.75 1 1.5 2 2.5 3 4 5 6 7.5 9 10 12.5
M / 4 2 4 6 8 12 16 20 24 32 40 48 60 72 80 100
G / 2 1 2 3 4 6 8 10 12 16 20 24 30 36 40 50
J / 2.4384 1.22 2.44 3.66 4.88 7.32 9.75 12.19 14.63 19.51 24.38 29.26 36.58 43.89 48.77 60.96
B / 1.2192 0.6 1.2 1.8 2.4 3.7 4.9 6.1 7.3 9.8 12.2 14.6 18.3 22 24.4 30.5
AB / 1 0.5 1 1.5 2 3 4 5 6 8 10 12 15 18 20 25
AA / 0.6096 0.3 0.6 0.9 1.2 1.8 2.4 3.1 3.7 4.9 6.1 7.3 9.1 11 12.2 15.2
AF / 0.3 0.15 0.3 0.45 0.6 0.9 1.2 1.5 1.8 2.4 3 3.6 4.5 5.4 6 7.5
Technical drawings

Mechanical dimensions and performance curves

SP20SLA external drive dimensions
External-drive configuration and nut interface.
SP20SLA through shaft dimensions
Through-shaft configuration.
SP20SLA c type fixed shaft dimensions
C-type fixed-shaft configuration.
SP20SLA k type fixed shaft dimensions
K-type fixed-shaft configuration.
SP20SLA single-stack thrust speed curves
Single-stack reference curves at 0.5 A RMS; recommended load limit 4.5 kg.
SP20SLA double-stack thrust speed curves
Double-stack reference curves at 0.5 A RMS; recommended load limit 4.5 kg.
Mechanical integration

Four formats for different motion architectures

Select the construction according to how the lead screw, nut and moving element are arranged.

  • External drive for a travelling external nut
  • Through shaft for screw access on both sides
  • C-type fixed shaft for customer-defined travel
  • K-type fixed shaft with standard stroke combinations
SP20SLA 20 mm sliding lead screw linear actuator configurations
Configuration options

Adapt the actuator to the mechanism

Lead-screw end machining

Threaded, plain, unmachined and customer-specific ends are available.

Anti-backlash nut

External-drive and through-shaft anti-backlash arrangements can be reviewed.

Encoder feedback

Incremental encoder options are available; confirm resolution and output format.

Electromagnetic brake

Optional 20-series brake: 24 VDC ±5%, 9.6 W, static torque above 0.06 N·m, insulation class B.

Application fields

Designed for compact precision mechanisms

Laboratory automation

Sample handling, dispensing and compact positioning.

Medical instruments

Motion for diagnostic and analytical equipment, subject to system validation.

Optical positioning

Controlled adjustment of lenses, sensors and optical components.

Valves and pumps

Actuation for compact valves, dosing pumps and flow-control assemblies.

Selection information

Define the actuator around the load

Use travel, lead, speed, axial load, motor length and feedback requirements to select the configuration.

Motor frame20 mm
Motor lengths27.2 / 38.1 mm
Phase current0.5 A RMS
Lead options0.3–8 mm
Maximum thrustUp to 70 N

Configure the SP20SLA for your mechanism.

Send stroke, lead, speed, axial load, end machining, feedback and brake requirements for review.

Request consultation  →

Explore related linear motion solutions

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Perfection in a new dimension

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SP20SLA 20 mm Sliding Lead Screw Linear Actuator
20 mm sliding lead screw linear actuator with up to 70 N thrust, 0.3–8 mm lead options, four mechanical configurations, encoder, brake and anti-backlash options.

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