Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 25mm and 20mm give 4 controllable stop positions across a 45mm total travel, with a Ø50mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Stroke 125 mm
- Stroke 220 mm
- Total travel45 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S
The AirTAC SCT50X25X20S is a double-acting multi-position tandem cylinder that delivers four fixed rod positions: fully retracted (0 mm), 25 mm, 20 mm, and the combined total travel of 45 mm. Each 50 mm bore section generates 982 N of push force and 825 N of pull force when supplied with 0.5 MPa air, making it suitable for light diverting or sorting tasks where two short, distinct strokes are needed from a single compact unit.
This model includes a built-in magnet (-S suffix), allowing easy attachment of CMSG, DMSG, or EMSG reed and solid-state sensors directly to the tie-rod barrel for end-of-stroke or intermediate position confirmation. The cylinder uses a 20 mm diameter piston rod, M16x1.5 rod thread, and PT1/4 ports, with a 21 mm adjustable air cushion at each end to manage deceleration. Its body length A(SCT) is 243 mm.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø50 mm |
| Stroke 1 / Stroke 2 | 25 / 20 mm |
| Total travel | 45 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, 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) | 20 mm |
| P3 (both extended) | 45 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SCT50X25X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm (SCT range 32–100). |
| ×25 | 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 SCT50X25X20S Is Used
Two-Way Part Diverting
Extend the rod to 20 mm to push parts onto one conveyor lane, or to 25 mm for a second lane, using the four distinct positions for reliable, repeatable sorting.
Multi-Stop Feeding
Advance material in precise 20 mm or 25 mm increments into a stamping or cutting zone, with the 45 mm total stroke used for clearing or setup.
Two-Depth Insertion
Use the 20 mm stroke for a shallow press-fit operation and the 25 mm stroke for a deeper secondary insertion, all controlled by a single tandem cylinder.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X25X20S the Right Cylinder?
Select the SCT50X25X20S when your application requires four discrete linear positions without the complexity of servo controls or multiple actuators. This tandem configuration is more compact and cost-effective than installing two separate 50 mm bore cylinders with external hard stops to achieve the 0, 25, 20, and 45 mm positions. If your force requirements are lower, stepping down to a 40 mm bore SCT reduces push force to 628 N per section at 0.5 MPa. For a direct replacement, match the 50 mm bore, both 25 mm and 20 mm strokes, PT port thread, basic mounting, and the integrated magnet (-S) to ensure sensor compatibility.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 25 + 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 SCT50X25X20S FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 25 mm (first section extended), 20 mm (second section extended), and 45 mm (both sections extended for total travel). The positions are fixed by the two stroke lengths and are not infinitely adjustable.
The SCT integrates two piston sections on a single rod line, saving space and eliminating the need to synchronize two separate actuators and their mountings. It provides the same four-position functionality in a more compact package with a single set of ports and a 243 mm body length. A direct replacement must match the 50 mm bore, the 25 mm and 20 mm strokes, and the built-in magnet for sensor mounting.
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