Rodless cylinders for long strokes
Rodless cylinders move loads over long distances without a piston rod extending out. For a given stroke they save almost half the installed length, which suits gantries, handling and axes. This guide shows how to pick the design type, bore, guidance and permissible moments correctly.
View rodless cylindersWhich design type fits my application?
Rodless cylinders transfer force from the piston to an external carriage through a slot or magnetically. The band-sealed slotted cylinder delivers high force and long strokes but needs a clean environment. The magnetic cylinder is fully closed and leak-free but transmits only a limited force through the magnetic coupling. The choice depends on force, sealing and environment.
How do I size bore and stroke?
Theoretical force is piston area times working pressure. For moving masses, add acceleration and friction and keep a reserve. On long strokes the profile deflection limits the load at mid-span, so intermediate supports or a larger profile are often needed. Always assess stroke, mass and speed together.
- Collect moving mass, speed and stroke from the specification.
- Match end-position cushioning to the kinetic energy or plan external shock absorbers.
- For strokes above about 2 m, add intermediate supports against deflection.
Do I need an integrated guide?
A plain rodless cylinder takes only limited lateral and moment loads. As soon as the carriage carries side loads or tilting moments, a guide is needed. Plain guides are cheap and run smoothly, while ball or roller guides carry higher moments at low friction. Compare the permissible moments Mx, My and Mz with your real load.
Frequently asked questions
Why use a rodless cylinder instead of a standard cylinder?
It moves long strokes in half the installed length because no piston rod extends. That saves space on gantries and long axes and avoids the buckling risk of a far-extended rod.
How much stroke is possible with a rodless cylinder?
Depending on the profile, strokes of several metres, sometimes over 8 m, are possible. On long strokes deflection limits the mid-span load, so plan larger profiles or intermediate supports.
When do I need an integrated guide?
As soon as the carriage must take side forces or tilting moments. A basic cylinder carries only centred, light loads. For handling and positioning, choose a profile or roller guide.
Find the right rodless cylinder
Our pneumatics specialists help with design type, bore, stroke and guidance for your axis.
Vetted selection
Recommendations from maker data and field values.
Correct sizing
Stroke, force and moments cleanly matched.
Long service life
Guidance, cushioning and clean-air notes included.
Expert advice
Pneumatics specialists support your selection.