Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 20mm give 4 controllable stop positions across a 145mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 1125 mm
- Stroke 220 mm
- Total travel145 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S
The SCT40X125X20S is a tandem multi-position cylinder that provides four fixed rod positions by combining its two piston sections: 0 mm (fully retracted), 20 mm, 125 mm, and the total extended length of 145 mm. Each section independently generates 628 N of push force at 0.5 MPa, making it a space-saving alternative to using two separate actuators for a two-depth operation.
This model comes with a built-in magnet (-S suffix), allowing easy attachment of CMSG, DMSG, or EMSG sensors directly to the 40 mm bore tie-rod body for precise end-of-stroke or intermediate position detection. The 16 mm diameter piston rod and PT1/4 ports handle standard pneumatic connections, while the 21 mm adjustable air cushion at each end section ensures smooth deceleration.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 125 / 20 mm |
| Total travel | 145 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) | 125 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 145 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 SCT40X125X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×125 | Stroke 1 (section 1) in mm. |
| ×20 | 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 SCT40X125X20S Is Used
Two-Stage Sorting Gate
Uses the 20 mm stroke for a partial gate opening to divert small items and the full 145 mm stroke to pass larger packages, all from one compact actuator.
Dual-Depth Label Press
Applies a label with a light touch at the 125 mm stop, then uses the full 145 mm travel for a firm secondary press on thicker materials.
Multi-Stop Part Feeding
Advances parts in two increments—a short 20 mm push for alignment and a longer 125 mm push to load the next station—controlled by valving each section.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X20S the Right Cylinder?
Choose the SCT40X125X20S when your application requires a compact, single-rod solution to reach two distinct extended positions without complex external hard stops. For higher thrust, stepping up to the 50 mm bore provides 982 N of push per section. This cylinder is a direct replacement for another AirTAC SCT40 with 125 mm and 20 mm strokes, PT ports, and a magnetic piston; ensure any replacement matches both stroke lengths exactly to maintain the programmed stop positions.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 125 + 20 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 SCT40X125X20S FAQ
This 4-position cylinder stops at 0 mm (home), 20 mm (section 2 extended), 125 mm (section 1 extended), and 145 mm (both sections extended). The stops are discrete and fixed by the two stroke lengths.
The SCT integrates two piston sections on a single rod line, saving space and eliminating the need to synchronize two actuators. It provides fixed intermediate stops without external brackets, but it does not double the force; each section delivers the standard single-cylinder thrust for its bore.
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