Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 250mm give 4 controllable stop positions across a 325mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 175 mm
- Stroke 2250 mm
- Total travel325 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S
The SCT40X75X250S is a double-acting multi-position cylinder that delivers four fixed rod positions—0 mm, 75 mm, 250 mm, and the combined total travel of 325 mm—by pressurising its two tandem piston sections independently. Each section produces a push force of 628 N at 0.5 MPa, rising to 1130 N at the maximum operating pressure of 0.9 MPa, driven through a 16 mm diameter piston rod.
Equipped with a built-in magnet, this model accepts CMSG, DMSG, or EMSG sensors directly on its tie-rod barrel for non-contact position feedback. The cylinder body has a length of 235 mm plus the strokes, uses PT1/4 ports, and features an adjustable air cushion of 21 mm in each section to decelerate the load smoothly at the end of travel.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 75 / 250 mm |
| Total travel | 325 mm |
| Stop positions | 4 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 (4)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 75 mm |
| P2 (section 2) | 250 mm |
| P3 (both extended) | 325 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 SCT40X75X250S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×75 | 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 SCT40X75X250S Is Used
3-Stage Sorting Gate
Direct packages to three separate conveyor lanes by stopping the cylinder rod at 0 mm (lane 1), 75 mm (lane 2), and 250 mm (lane 3), with the 325 mm position used for a reject chute.
Two-Depth Clamping Fixture
Clamp a family of parts with two different thicknesses. The 75 mm stroke secures thin workpieces, while the 250 mm stroke handles taller components, all from a single pneumatic circuit.
Multi-Step Adhesive Dispensing
Move a dispensing nozzle to three precise heights above a workpiece. The 75 mm and 250 mm stops allow for a rapid approach, a controlled dispense gap, and a full retract position.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X250S the Right Cylinder?
Choose this 4-position tandem cylinder when a single actuator must stop at two intermediate points without the complexity of two separate cylinders and external hard stops. The SCT40 bore is a compact workhorse; if your application demands higher force, stepping up to the 50 mm bore provides 982 N of push per section at the same 0.5 MPa pressure. For a direct replacement, match the 40 mm bore, the 75 mm and 250 mm section strokes, the PT port thread, the basic mounting style, and the integrated magnet (-S suffix). Because the second stroke is 250 mm, ensure the rod is adequately guided if the load applies significant side force, particularly near full extension.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 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 SCT40X75X250S FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 75 mm (first section extended), 250 mm (second section extended), and 325 mm (both sections extended). The positions are fixed by the two stroke lengths and are not infinitely adjustable.
No, like all standard pneumatic cylinders, the SCT40X75X250S will not hold its position under a loss of pressure. The piston can drift or drop if the load is vertical. If position holding without pressure is required, you must add an external rod lock or a pilot-operated check valve to the circuit.
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