Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 120mm and 120mm give 3 controllable stop positions across a 240mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1120 mm
- Stroke 2120 mm
- Total travel240 mm
- Positions3 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S
The SCT80X120X120S is a double-acting tandem cylinder providing three fixed rod positions: fully retracted (0 mm), mid-stroke at 120 mm, and fully extended at 240 mm. Each piston section generates a push force of 2513 N at 0.5 MPa, delivering robust power for multi-stop material handling or sorting tasks on an 80 mm bore platform.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for non-contact position sensing. The 25 mm diameter rod resists bending, and the 28 mm air cushion at each end decelerates the load smoothly. The total body length A(SCT) is 296 mm plus the two 120 mm strokes.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 120 / 120 mm |
| Total travel | 240 mm |
| Stop positions | 3 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT3/8 |
| 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, 28 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 (3)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 120 mm |
| P2 (both extended) | 240 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SCT80X120X120S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×120 | Stroke 1 (section 1) in mm. |
| ×120 | 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 SCT80X120X120S Is Used
Three-Position Diverter Gate
Actuates a product diverter on a conveyor to three lanes: retracted for lane one, mid-position at 120 mm for lane two, and fully extended at 240 mm for lane three, all from a single compact cylinder.
Multi-Level Pallet Stop
Controls a pallet stop with three heights. The 0 mm position allows pallets to pass, the 120 mm stop engages a lower pallet, and the 240 mm stop holds a taller pallet, sequenced by two valves.
Two-Depth Pressing Station
Provides two distinct pressing depths in a light assembly press. The first piston section advances to a 120 mm pre-press position, and engaging the second section drives the tool to the full 240 mm depth.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X120X120S the Right Cylinder?
Choose the SCT80X120X120S when a single actuator must stop a load at three precise locations without the complexity of two separate cylinders and external hard stops. It simplifies the pneumatic circuit and reduces mounting hardware compared to a dual-cylinder setup. If the per-section thrust is too high, stepping down to a 63 mm bore reduces push force to 1559 N at 0.5 MPa.
For a direct replacement, match the 80 mm bore, both 120 mm strokes, PT port thread, basic mounting, and the -S magnet. When a section stroke reaches 120 mm, the rod is fully supported by the front guide bush, but if the load has a significant side component, consider an external guide rail to protect the rod bearing from premature wear.
Multi-position checklist
- ✓ Need 3 repeatable stops?
- ✓ Section strokes 120 + 120 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 SCT80X120X120S FAQ
It provides three discrete mechanical stop positions: 0 mm (fully retracted), 120 mm (first section extended), and 240 mm (both sections extended). The stops are fixed by the cylinder's internal structure and are not infinitely adjustable.
No, the SCT80X120X120S does not have a mechanical lock. If air pressure is lost or the valve centers, the piston can drift from the 120 mm position. To hold a load securely at mid-stroke without live pressure, you must add an external rod brake or a pilot-operated check valve in the circuit.
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