Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 40mm and 25mm give 4 controllable stop positions across a 65mm total travel, with a Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Stroke 140 mm
- Stroke 225 mm
- Total travel65 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25
The SCT63X40X25 is a double-acting tandem cylinder that delivers four fixed rod positions from two unequal strokes: 0 mm (fully retracted), 40 mm, 25 mm, and 65 mm (total travel). This 63 mm bore unit uses a 20 mm diameter piston rod and PT1/4 ports, providing a push force of 1559 N per actuated section at 0.5 MPa.
With a body length A(SCT) of 249 mm and a 28 mm adjustable air cushion on each section, the cylinder decelerates the load smoothly at every stop. The per-section thrust rises to 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust choice for sorting or diverting tasks where the stroke differential creates a clear mechanical sequence.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 mm |
| Stroke 1 / Stroke 2 | 40 / 25 mm |
| Total travel | 65 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 28 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 (4)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 40 mm |
| P2 (section 2) | 25 mm |
| P3 (both extended) | 65 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SCT63X40X25
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm (SCT range 32–100). |
| ×40 | Stroke 1 (section 1) in mm. |
| ×25 | 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 SCT63X40X25 Is Used
Two-Depth Part Insertion
Use the 25 mm and 40 mm stops to insert a component to a shallow depth, then a deeper depth, all with one compact tandem cylinder.
Three-Gate Diverter
The four rod positions (0, 25, 40, 65 mm) can align a chute with three different conveyor lanes, simplifying multi-stream sorting.
Sequential Clamping
Apply a light clamp at the 25 mm position and full clamping force at the 40 mm or 65 mm position, controlling pressure to each section independently.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X25 the Right Cylinder?
Choose the SCT63X40X25 when your process needs four distinct stop points without the complexity of two separate cylinders and external hard stops. The 40 mm and 25 mm stroke combination is ideal for applications like two-depth pressing or a three-gate diverter where the intermediate positions are reached by pressurising one section or the other. If the 1559 N push force per section is insufficient, stepping up to the 80 mm bore provides 2513 N per section at the same 0.5 MPa.
For a direct replacement, match the 63 mm bore, both the 40 mm and 25 mm strokes, PT port thread, and basic mounting. If your application requires position sensing, specify the -S magnet option to use CMSG or DMSG sensors. For strokes over 300 mm, consider external guiding to protect the 20 mm rod from side loads.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 40 + 25 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 SCT63X40X25 FAQ
It provides four discrete rod positions: 0 mm (fully retracted), 40 mm (section 1 extended), 25 mm (section 2 extended), and 65 mm (both sections extended). The stops are fixed by the two stroke lengths and are not infinitely adjustable.
No, like all standard pneumatic cylinders, the SCT63X40X25 will drift or drop if pressure is lost or a valve is centred. To hold a load at a specific stop without live pressure, you must add an external rod lock, a mechanical brake, or a pilot-operated check valve.
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