Positioning
Linear Motion & Actuators replacement guide
Identify linear bearings, profile rails, ball screws, lead screws, linear actuators, slides, guide systems, and rodless actuators by geometry, load, accuracy, and drive interface.
Evidence boundary. Linear components often look interchangeable while differing in rail geometry, preload, accuracy class, end machining, seals, and carriage dimensions. Verify the full mechanical interface.
Items covered01 · 12 component types
- Linear bearings
- Linear bushings
- Profile rails
- Linear guide carriages
- Ball screws
- Lead screws
- Electric linear actuators
- Linear stages
- Linear slides
- Rodless actuators
- Telescoping actuators
- Linear guide systems
What to capture02
Manufacturer, series, rail or screw size, and carriage styleRecord this before searching for a substitute.
Travel, stroke, screw lead or pitch, and orientationRecord this before searching for a substitute.
Mounting-hole pattern, rail geometry, shaft diameter, and end machiningRecord this before searching for a substitute.
Load, moment, speed, accuracy, preload, and lifeRecord this before searching for a substitute.
Motor, gearbox, encoder, sensor, and lubrication interfacesRecord this before searching for a substitute.
What must match03
Envelope and mounting geometryConfirm it against the original equipment, duty, and source documentation.
Static, dynamic, and moment load ratingsConfirm it against the original equipment, duty, and source documentation.
Accuracy, preload, rigidity, and backlashConfirm it against the original equipment, duty, and source documentation.
Travel, speed, acceleration, and duty cycleConfirm it against the original equipment, duty, and source documentation.
Drive, lubrication, sealing, and environmental compatibilityConfirm it against the original equipment, duty, and source documentation.
Common searches04
What linear bearing replaces this part number?
How do I replace a linear guide rail and carriage?
What ball screw matches this assembly?
Can a linear actuator with the same stroke replace mine?
Authoritative starting points05
Manufacturer-backed profile-rail lookup400 live Schaeffler LLT/LLU records
Schaeffler LLT ball and LLU roller profile rail guide lookup
Browse exact live carriages, rails, systems, and accessories with manufacturer descriptions and complete detail-table specifications.
Browse 400 Schaeffler profile rail guide components →Manufacturer-backed linear-unit lookup400 live Schaeffler designations
Schaeffler single linear unit designation lookup
Browse exact current single-linear-unit designations with housing geometry, shaft size, load data, speed/acceleration limits, and live manufacturer detail-table evidence.
Browse 400 Schaeffler single linear units →Manufacturer-backed linear bearing lookup318 live Schaeffler designations
Schaeffler linear ball bearing designation lookup
Browse all current Schaeffler linear-ball-bearing designations with manufacturer descriptions and exact live detail-table specifications.
Browse 318 Schaeffler linear ball bearings →Related lookup guides1 workflow