Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 25mm and 50mm give 4 controllable stop positions across a 75mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 125 mm
- Stroke 250 mm
- Total travel75 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50
The SCT40X25X50 tandem cylinder provides four fixed rod positions—0 mm, 25 mm, 50 mm, and the combined 75 mm total travel—by pressurising its two piston sections independently or together. Each 40 mm bore section generates 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), driven by a 16 mm diameter rod through PT1/4 ports.
This double-acting multi-position unit uses a tie-rod construction with a 21 mm adjustable air cushion at each end to manage deceleration. The body length A is 235 mm, making it a compact solution for tasks requiring three intermediate stopping points without the complexity of servo controls.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 25 / 50 mm |
| Total travel | 75 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) | 25 mm |
| P2 (section 2) | 50 mm |
| P3 (both extended) | 75 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 SCT40X25X50
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×25 | Stroke 1 (section 1) in mm. |
| ×50 | 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 SCT40X25X50 Is Used
Two-Stage Sorting Gate
Directs packages to three separate conveyor lanes by stopping the diverting arm at 0 mm (lane 1), 25 mm (lane 2), and 75 mm (lane 3), using the 50 mm position for a mid-stroke clearing action.
Multi-Depth Label Applicator
Applies labels at two different heights on a product. The 25 mm stroke positions the tamp pad for the first surface, while the full 75 mm extension reaches a recessed second surface.
Sequential Part Clamping
Clamps a workpiece with a light 25 mm touch for alignment, then moves to the full 75 mm position for high-force holding, using the 50 mm stop as an intermediate release step in an automated welding fixture.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X25X50 the Right Cylinder?
Choose the SCT40X25X50 when a process needs four distinct mechanical stops from a single pneumatic axis, avoiding the cost and logic of two separate cylinders or external hard stops. If higher force is required, the 50 mm bore SCT series offers 982 N of push per section at 0.5 MPa. For replacement, match the 40 mm bore, both stroke lengths (25 mm and 50 mm), PT port thread, and basic mounting configuration. A magnet-equipped SCT40X25X50S is required if sensor feedback is needed.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 25 + 50 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 SCT40X25X50 FAQ
This tandem cylinder provides four discrete rod positions: fully retracted (0 mm), first section extended (25 mm), second section extended (50 mm), and both sections extended for the total travel (75 mm). It does not offer infinitely variable positioning.
The SCT tandem design integrates both strokes on a single common rod and piston line, ensuring the 25 mm and 50 mm positions are mechanically fixed relative to each other. This eliminates the need to synchronise two separate cylinders and their mounting brackets, saving space and simplifying pneumatic control with just two directional valves.
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