SP28SLA 28 mm Sliding Lead Screw Linear Actuator

Sliding Lead Screw Linear Actuator
28 mm sliding lead screw linear actuator with up to 150 N thrust, 0.3175–10.16 mm lead options, four mechanical configurations, encoder and power-off brake 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 28 mm actuator frame

SP28SLA is a 28 mm sliding lead screw linear actuator that combines a compact hybrid stepper motor with a precision lead screw for controlled linear motion. Four mechanical configurations, two motor lengths and leads from 0.3175 to 10.16 mm support compact automation and instrument mechanisms.

28 mm

Compact frame

A square 28 mm mounting envelope for space-constrained linear-motion assemblies.

Up to 150 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

28 mmFrame size
Up to 150 NMaximum thrust
0.3175–10.16 mmLead range
33.35 / 45Motor length (mm)
Electrical

Motor specifications

Single- and double-stack windings for current and voltage matching.

Configuration Motor length Phase voltage Phase current Phase resistance Phase inductance Weight
Single-stack 33.35 mm 4.5 V 0.5 A 9.1 Ω 6 mH 117 g
Single-stack 33.35 mm 2.2 V 1.0 A 2.1 Ω 1.5 mH 117 g
Double-stack 45 mm 3.9 V 0.95 A 4.1 Ω 4 mH 173 g
Double-stack 45 mm 2.4 V 1.6 A 1.5 Ω 1.3 mH 173 g

Insulation class B. Maximum temperature rise: 80°C. 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.

Lead code Lead (mm) Travel / 1.8° step (mm) Availability
AL 0.3175 0.0016 Standard
A 0.635 0.0032 Standard
D 1.27 0.0063 Standard
F 1.5875 0.0079 Standard
J 2.4384 0.0122 5.56 mm screw; external drive only
K 2.54 0.0127 Standard
AC 4.76 0.0238 Standard
Q 4.8768 0.0244 5.56 mm screw; external drive only
R 5.08 0.0254 Standard
X 10.16 0.0508 Standard

J and Q use a 5.56 mm screw and are available for the external-drive configuration only.

C-type fixed shaft

C-type stroke selection

Dimensions in millimetres; motor length L is selected by winding.

Dimension A Stroke B Motor length L
22.2 12.7 33.35 / 45
28.55 19.05 33.35 / 45
34.9 25.4 33.35 / 45
41.3 31.8 33.35 / 45
47.6 38.1 33.35 / 45
60.3 50.8 33.35 / 45
73 63.5 33.35 / 45
K-type fixed shaft

K-type stroke selection

Dimension C depends on motor length L.

Dimension A Stroke B C at L=33.35 C at L=45
14.7 12.7 1 0
22.1 19.05 7.8 0
27.4 25.4 13.7 4.6
33.8 31.8 20.1 11
40.1 38.1 26.4 17.4
52.8 50.8 39 29.8
63.5 63.5 52.7 42.5
Optional holding brake

Power-off brake specifications

Electromagnetic holding brake for controlled power-off retention.

Parameter Specification
Rated voltage 24 VDC ±5%
Coil resistance 143.7 Ω ±10%
Power 5.5 W
Static torque >0.3 N·m
Insulation class B
Insulation resistance >100 MΩ at 500 VDC
Dielectric strength 1000 VAC for 1 s
Pull-in / release time 50 ms / 50 ms
Rotation clearance 1°
Emergency braking 200 cycles
Mechanical life 500,000 cycles
Noise <60 dB(A)
Speed conversion

Lead-specific linear speed reference

Calculated 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
AL / 0.3175 0.16 0.32 0.48 0.64 0.95 1.27 1.59 1.91 2.54 3.17 3.81 4.76 5.71 6.35 7.94
A / 0.635 0.32 0.64 0.95 1.27 1.91 2.54 3.17 3.81 5.08 6.35 7.62 9.53 11.43 12.7 15.88
D / 1.27 0.64 1.27 1.91 2.54 3.81 5.08 6.35 7.62 10.16 12.7 15.24 19.05 22.86 25.4 31.75
F / 1.5875 0.79 1.59 2.38 3.17 4.76 6.35 7.94 9.53 12.7 15.88 19.05 23.81 28.57 31.75 39.69
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
K / 2.54 1.27 2.54 3.81 5.08 7.62 10.16 12.7 15.24 20.32 25.4 30.48 38.1 45.72 50.8 63.5
AC / 4.76 2.38 4.76 7.14 9.52 14.28 19.04 23.8 28.56 38.08 47.6 57.12 71.4 85.68 95.2 119
Q / 4.8768 2.44 4.88 7.32 9.75 14.63 19.51 24.38 29.26 39.01 48.77 58.52 73.15 87.78 97.54 121.92
R / 5.08 2.54 5.08 7.62 10.16 15.24 20.32 25.4 30.48 40.64 50.8 60.96 76.2 91.44 101.6 127
X / 10.16 5.08 10.16 15.24 20.32 30.48 40.64 50.8 60.96 81.28 101.6 121.92 152.4 182.88 203.2 254
Technical drawings

Mechanical dimensions and performance curves

SP28SLA external drive dimensions
External-drive configuration and nut interface.
SP28SLA through shaft dimensions
Through-shaft configuration.
SP28SLA c type fixed shaft dimensions
C-type fixed-shaft configuration.
SP28SLA k type fixed shaft dimensions
K-type fixed-shaft configuration.
SP28SLA single-stack thrust speed curves
Single-stack reference curves at 1.0 A RMS; recommended load limit 14 kg.
SP28SLA double-stack thrust speed curves
Double-stack reference curves at 1.6 A RMS; recommended load limit 14 kg.
SP28SLA power-off brake dimensions
Optional power-off brake dimensions; electrical and performance data are listed in the HTML table above.
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
SP28SLA 28 mm sliding lead screw linear actuator configurations
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 frame28 mm
Motor lengths33.35 / 45 mm
Phase current0.5 A RMS
Lead options0.3175–10.16 mm
Maximum thrustUp to 150 N

Configure the SP28SLA 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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SP28SLA 28 mm Sliding Lead Screw Linear Actuator
28 mm sliding lead screw linear actuator with up to 150 N thrust, 0.3175–10.16 mm lead options, four mechanical configurations, encoder and power-off brake options.

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