Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 25mm give 4 controllable stop positions across a 100mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 175 mm
- Stroke 225 mm
- Total travel100 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25
The SCT40X75X25 tandem cylinder provides four distinct rod positions—0 mm, 25 mm, 75 mm, and the full 100 mm extension—by selectively pressurising its two piston sections. Each section generates 628 N of push force at 0.5 MPa (879 N at 0.7 MPa), making it suitable for sorting gates or multi-depth pressing tasks where a single-rod solution would require external stops.
This 40 mm bore unit uses a 16 mm diameter rod with an M12x1.25 thread and PT1/4 ports. The tie-rod construction incorporates a 21 mm adjustable air cushion in each section, and the body length A(SCT) is 235 mm. Operating pressure ranges from 0.15 to 1.0 MPa with standard TPU seals rated for -20 to +70 °C.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 75 / 25 mm |
| Total travel | 100 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) | 25 mm |
| P3 (both extended) | 100 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 SCT40X75X25
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×75 | 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 SCT40X75X25 Is Used
Two-Way Diverter Gate
Use the 25 mm and 75 mm positions to direct parts onto two separate conveyor lanes from a single infeed, eliminating the need for a separate actuator per lane.
Multi-Depth Pressing
Achieve a shallow 25 mm press depth and a deeper 75 mm press depth in one cycle by pressurising the short-stroke section, then the long-stroke section sequentially.
Staged Clamping Fixture
Clamp a workpiece lightly at 25 mm extension for alignment, then apply full clamping force at 100 mm total travel, all controlled by the tandem piston sections.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X25 the Right Cylinder?
Choose the SCT when your process needs two or more fixed end-of-stroke positions without the complexity of servo control. This 40 mm bore model suits moderate force applications; if you need higher thrust, stepping up to the 50 mm bore (SCT50X75X25) provides 982 N push per section at 0.5 MPa. For lighter, faster cycling, the 32 mm bore (402 N push) reduces mass.
For direct replacement, match the 40 mm bore, both strokes (75 mm and 25 mm), PT1/4 port thread, and basic mounting. If your application requires position sensing, specify the -S magnet option to use CMSG or DMSG sensors. Note that with a 75 mm section stroke, side-loading is typically minimal, but always align the rod with the load to prevent bending.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 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 SCT40X75X25 FAQ
This tandem cylinder provides four discrete positions: fully retracted (0 mm), 25 mm, 75 mm, and the combined total travel of 100 mm. The stops are fixed by the two section strokes and are not infinitely adjustable.
Yes, in many cases. It replaces a 25 mm stroke and a 75 mm stroke cylinder mounted in series, providing the same four positions from a single, compact tie-rod body. Ensure the porting (PT1/4) and mounting style match your existing setup.
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