0.005–0.03 mm
Travel per step
Choose the lead to balance positioning increment, linear speed and available thrust.
SP28BSA 28 mm Ball Screw Linear Actuator
Ball Screw Linear Actuator
SP28BSA 28 mm ball screw linear actuator provides 1, 2 and 6 mm lead options, C7 accuracy and recommended load capacity up to 140 N.
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
28 mm precision linear motion
Compact ball screw positioning with three lead options
The SP28BSA 28 mm ball screw linear actuator combines a stepper motor with a C7 external-drive ball screw. Lead options of 1, 2 and 6 mm provide 0.005, 0.01 or 0.03 mm travel per 1.8° step for guided precision mechanisms.
C7
Ball screw accuracy grade
Hardened SCM415H shaft and nut construction with axial clearance of no more than 0.02 mm.
External drive
Flexible mechanical integration
Specify screw length, end machining, feedback and brake options for the guided application axis.
Technical data
28 mm ball screw linear actuator specifications
28 mmFrame size
Up to 140 NRecommended load limit
1 / 2 / 6 mmBall screw lead
≤0.02 mmAxial clearance
Electrical platform
Motor electrical specifications
| Winding | Voltage | Current | Resistance | Inductance | Lead wires | Motor length |
|---|---|---|---|---|---|---|
| Winding option A | 2.1 V | 1 A | 2.1 Ω | 1.5 mH | 4 | 33.35 mm |
| Winding option B | 3.9 V | 0.95 A | 4.1 Ω | 4 mH | 4 | 45 mm |
Ball screw platform
Ball screw specifications
| Selection | Ball diameter | Thread starts | Thread direction | Screw shaft diameter | Circulation | Material | Surface hardness | Rust protection | Accuracy grade |
|---|---|---|---|---|---|---|---|---|---|
| Lead option A | Ø0.8 mm | 1 | Right-hand | Ø5.3 mm | 3.7 × 1 | SCM415H | HRC58–62 | Anti-rust oil | C7 |
| Lead option B | Ø0.8 mm | 1 | Right-hand | Ø5.1 mm | 2.7 × 1 | SCM415H | HRC58–62 | Anti-rust oil | C7 |
| Lead option C | Ø0.8 mm | 2 | Right-hand | Ø5.2 mm | 1.6 × 2 | SCM415H | HRC58–62 | Anti-rust oil | C7 |
Lead selection
Travel, nut dimensions and load ratings
| Selection | Lead | Travel per 1.8° step | A | B | C | D | H | W | X | E | Axial clearance | Rated dynamic load | Rated static load |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lead option A | 1 mm | 0.005 mm | 24 mm | 3.5 mm | 15 mm | 12 mm | 16 mm | 18 mm | 3.4 mm | — | ≤0.02 mm | 680 N | 1200 N |
| Lead option B | 2 mm | 0.01 mm | 29 mm | 4 mm | 17 mm | 15 mm | 19 mm | 22 mm | 3.4 mm | — | ≤0.02 mm | 880 N | 1500 N |
| Lead option C | 6 mm | 0.03 mm | 27 mm | 4 mm | 17.2 mm | 14 mm | 16 mm | 21 mm | 3.4 mm | 5 mm | ≤0.02 mm | 870 N | 1450 N |
Mechanical interface
External-drive dimension callouts
| Screw assembly length | Motor length | Front step | Front pilot | Frame | Pilot square | Mounting holes | Lead wires | Wire strip | Nut mounting angle |
|---|---|---|---|---|---|---|---|---|---|
| 100 ±1 mm | L ±0.5 mm | 1.5 ±0.2 mm | Ø22 0/−0.05 mm | □28 mm | □23 ±0.15 mm | 4-M2.5, depth 2.5 min | 320 ±20 mm · 4 leads · AWG #26 | 6 mm | 30° / 30° |
Performance reference
Speed reference points
| Reference row | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| Lead option C speed (mm/s) | 3 | 6 | 12 | 15 | 30 | 45 | 60 | 75 | 90 |
| Lead option B speed (mm/s) | 1 | 2 | 4 | 5 | 10 | 15 | 20 | 25 | 30 |
| Lead option A speed (mm/s) | 0.5 | 1 | 2 | 2.5 | 5 | 7.5 | 10 | 12.5 | 15 |
| Motor speed (r/min) | 30 | 60 | 120 | 150 | 300 | 450 | 600 | 750 | 900 |
| Pulse rate (pps) | 100 | 200 | 400 | 500 | 1000 | 1500 | 2000 | 2500 | 3000 |
Test conditions: DS-OLS2-FPD bipolar constant-current chopper drive, 24 VDC and 100% operating current. Keep at least 50% performance reserve.
Feedback options
EK1 encoder resolution selection
| Resolution (CPR) | 100 | 108 | 120 | 125 | 128 | 200 | 250 | 256 | 300 | 360 | 400 | 500 | 1000 | 512 | 720 | 800 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Single-ended code | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Differential code | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P |
Compact feedback
EK7 encoder selection
| Resolution | Single-ended code | Differential code |
|---|---|---|
| 1000 CPR | 3 | D |
| 2000 CPR | 6 | G |
Holding option
Power-off brake specifications
| Rated voltage | Resistance | Power | Static torque | Insulation class | Insulation resistance | Dielectric strength | Pull-in time | Release time | Rotational clearance | Emergency braking | Mechanical life | Noise |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 24 VDC ±5% | 143.7 Ω ±10% | 5.5 W | >0.3 N·m | B | >100 MΩ at 500 VDC | 1000 VAC for 1 s | 50 ms | 50 ms | 1° | 200 cycles | 2,000,000 cycles | <60 dB |
Mechanical drawings
Dimensions and configurable hardware
Performance curves
Single-stack and double-stack thrust-speed reference
External-drive integration
Configure a guided precision positioning axis
The translating screw is supported by the application guide while the motor remains fixed. Select motor length, screw lead, screw length, end machining, encoder and brake according to the target stroke and duty cycle.
- 1, 2 and 6 mm ball screw lead options
- Application-specific screw length and end machining
- Optional EK1 or EK7 encoder feedback
- Optional 24 VDC power-off brake
Typical applications
Precision linear motion for compact OEM equipment
SP28BSA supports guided mechanisms that require selectable positioning increments, compact packaging and configurable feedback or holding options.
Laboratory automation
Sample handling, dosing, valve positioning and compact instrument axes.
Optical and inspection equipment
Lens adjustment, sensor positioning and guided inspection modules.
Semiconductor equipment
Fixture positioning, alignment and compact transfer mechanisms.
Compact robotics
Gripper adjustment, end-effector positioning and space-constrained linear motion.
Selection information
SP28BSA configuration summary
Choose the winding, ball screw lead, motor length and optional accessories from the technical data above. Confirm the final mechanism against load, speed, acceleration, guidance, stroke and duty-cycle requirements.
ProductSP28BSA
Frame size28 mm
ConfigurationExternal drive
Travel per step0.005 / 0.01 / 0.03 mm
Selection inputsStroke, load, speed, duty cycle, guidance, feedback and brake
Configure SP28BSA
Discuss your precision linear-motion requirement
Send the required stroke, load, target speed, positioning increment, duty cycle, installation orientation and screw-end drawing for engineering selection support.
Contact us
Would you like to learn more about our solutions?
We would be happy to advise you—personally, competently, and tailored to your requirements.
Perfection in a new dimension
Further Information
Short delivery times available for selected product configurations.
The TP+ HIGH TORQUE enables maximum torque density and maximum torsional rigidity—ideal for demanding applications with dynamic load changes and high positioning accuracy.
alpha Advanced Line gearboxes with increased durability and food-grade lubrication available.
The TP+ for coordinated pinion-rack systems for medium to high requirements. Typical areas of application in wood, plastic, and composite processing, in machining centers, or in automation.
With cynapse® and smart services, you can unleash the full potential of your drive system: sensor data is processed, visualized, and analyzed intelligently. Find out how the combination of gearboxes with cynapse® and our Smart Services can make your digital production faster, safer, and more efficient.
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