Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 250mm and 250mm give 3 controllable stop positions across a 500mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 1250 mm
- Stroke 2250 mm
- Total travel500 mm
- Positions3 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S
The SCT40X250X250S is a tandem multi-position cylinder that delivers three precise stop locations along its 500 mm total stroke: fully retracted (0 mm), mid-stroke at 250 mm, and fully extended at 500 mm. By pressurising the two 40 mm bore sections independently or simultaneously, you get a simple, reliable method for three-position actuation without complex servo controls. Each piston section generates a push force of 628 N at 0.5 MPa, rising to 1130 N at 0.9 MPa.
This model includes a factory-installed magnetic piston ring, designated by the 'S' suffix, allowing CMSG, DMSG, or EMSG solid-state and reed sensors to be clamped directly onto the tie-rod barrel for end-of-stroke or mid-position confirmation. The cylinder uses a 16 mm diameter piston rod, PT1/4 ports, and has an adjustable air cushion length of 21 mm at each end to decelerate the load smoothly. The body length A(SCT) is 235 mm, providing a compact footprint for the 500 mm total travel.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 250 / 250 mm |
| Total travel | 500 mm |
| Stop positions | 3 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke / section | Up to 500 mm standard |
Specifications follow the official AirTAC SCT (multi-position) datasheet. SCT is available in bores 32–100; each of the two sections has a 500 mm max standard stroke (800 mm max). Confirm against the product label before installation. Thread options: PT (standard) / G.
Stop Positions (3)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 250 mm |
| P2 (both extended) | 500 mm |
Positions are set by pressurising section 1, section 2, or both. With equal strokes you get 3 distinct positions; with unequal strokes you get 4.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Force is per actuated piston section (single-piston, same as the SC bore): push uses the full bore area, pull subtracts the rod area. Size with a safety margin.
Model Code: Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×250 | Stroke 1 (section 1) in mm. |
| ×250 | Stroke 2 (section 2) in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCD (double rod), SCJ (adjustable stroke). SCT mounting: Basic, FA, FB, CA, CB, LB. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S Is Used
Three-Position Sorting Gate
Direct packages to three separate conveyor lanes using the retracted, mid, and extended positions. The magnetic piston sensors verify the gate is clear at each stop, enabling high-speed sortation logic.
Two-Depth Press or Clamp
Apply a light clamp force at the 250 mm intermediate stop for delicate parts, then advance to the full 500 mm position for a high-force press operation, all with one compact actuator.
Multi-Stop Material Feed
Index material strips or trays at two distinct feed lengths (250 mm and 500 mm) in automated assembly cells. The pneumatic control is simple and robust in dusty or washdown environments.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S the Right Cylinder?
This three-position cylinder replaces setups that would otherwise require two separate cylinders with external stops and sequencing valves, reducing plumbing and mounting complexity. The SCT40X250X250S is ideal when your application needs a fixed intermediate stop at exactly 250 mm. For higher thrust requirements, consider stepping up to the 50 mm bore SCT50X250X250, which provides 982 N of push force per section at 0.5 MPa. For a lighter, more compact design, the 32 mm bore offers 402 N.
When replacing an existing SCT, ensure the replacement matches the 40 mm bore, both 250 mm strokes, PT port thread, and the basic mounting style. The long combined stroke of 500 mm introduces a risk of rod buckling under high side loads; if the load is not guided, use an external guide rail or rod alignment coupler to prevent bending and premature seal wear.
Multi-position checklist
- ✓ Need 3 repeatable stops?
- ✓ Section strokes 250 + 250 mm suit your layout?
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Plumb the two sections to the correct valves for each stop.
- check Adjust end cushion screws for smooth stops.
- check Use SCT mounting accessory (FA / FB / CA / CB / LB).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X250X250S FAQ
This model provides three distinct, fixed mechanical stops. The rod positions are 0 mm (fully retracted), 250 mm (first section extended), and 500 mm (both sections extended, total travel). The stops are achieved by pressurising the two piston sections in sequence, not by a servo or proportional control.
Yes, it is designed as a direct replacement for that exact configuration. It provides the same bore and two 250 mm strokes in a single, in-line body, simplifying mounting and eliminating the need to synchronise two separate cylinders. Ensure the replacement matches the PT port thread and the 'S' magnet option if you need sensor feedback.
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