Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 80mm and 20mm give 4 controllable stop positions across a 100mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 180 mm
- Stroke 220 mm
- Total travel100 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S
The SCT100X80X20S is a double-acting tandem cylinder that provides four fixed rod positions by combining an 80 mm stroke in the first section with a 20 mm stroke in the second. The reachable stops are at 0 mm (fully retracted), 20 mm, 80 mm, and the total travel of 100 mm when both sections are pressurized. Each 100 mm bore piston section generates a robust 3927 N of push force at 0.5 MPa, making it suitable for heavy-duty multi-stop indexing.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The cylinder uses a 25 mm diameter piston rod with an M20x1.5 thread, PT 1/2 ports, and a 29 mm air cushion at each end for controlled deceleration. The body length A(SCT) for this configuration is 308 mm plus the strokes.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 80 / 20 mm |
| Total travel | 100 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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, 29 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) | 80 mm |
| P2 (section 2) | 20 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×80 | 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S Is Used
Two-Stage Clamping
Uses the 20 mm stroke for a low-force pre-clamp and the 80 mm stroke for full-power clamping, providing a clear two-step engagement sequence for delicate assemblies.
Heavy Part Diverting
The four positions (0, 20, 80, 100 mm) can direct heavy pallets or castings to three different conveyor lanes with a single actuator, simplifying the machine layout.
Multi-Depth Pressing
Delivers two distinct pressing depths (20 mm and 80 mm) plus a full 100 mm retract, ideal for forming operations where a part requires a shallow and a deep hit in one cycle.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S the Right Cylinder?
Choose the SCT when your application requires up to four distinct mechanical stops without the complexity of servo control or the alignment issues of two separate cylinders. This 100 mm bore model is ideal for moving heavy fixtures; if your load is lighter, stepping down to an 80 mm bore SCT reduces the per-section push force to 2513 N at 0.5 MPa, which can save on air consumption. For a direct replacement, match the 100 mm bore, both the 80 mm and 20 mm strokes, PT port thread, and the -S magnet option. Since the combined stroke exceeds 100 mm, ensure the rod is adequately guided if significant side loads are present to prevent bending of the 25 mm rod.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 80 + 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X80X20S FAQ
This cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 20 mm (section 2 extended), 80 mm (section 1 extended), and 100 mm (both sections extended for total travel). The positions are fixed by the two stroke lengths and are selected by pressurizing the appropriate cylinder sections.
No, like all standard pneumatic cylinders, the SCT does not lock its position. If air pressure is exhausted or lost, the piston can drift or drop under load. To safely hold a position without live pressure, you must add an external mechanical rod lock or a pilot-operated check valve to trap air in the cylinder sections.
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