Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 70mm and 120mm give 4 controllable stop positions across a 190mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 170 mm
- Stroke 2120 mm
- Total travel190 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S
The SCT100X70X120S is a multi-position pneumatic cylinder that delivers four discrete rod stops—0 mm, 70 mm, 120 mm, and 190 mm total travel—from a single tie-rod body. It uses two tandem piston sections on a common 25 mm rod, each section providing 3927 N of push force at 0.5 MPa, making it suitable for material handling stations that need three distinct extended positions without multiple actuators.
A built-in magnet is integrated into the piston, allowing CMSG, DMSG, or EMSG sensors to mount directly on the barrel for contactless position sensing. The cylinder operates with filtered air from 0.15 to 1.0 MPa, features an adjustable pneumatic cushion (29 mm length) at both ends, and has a body length A of 308 mm. Standard PT1/2 ports and TPU seals suit ambient temperatures from -20 to +70 °C.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 70 / 120 mm |
| Total travel | 190 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) | 70 mm |
| P2 (section 2) | 120 mm |
| P3 (both extended) | 190 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 SCT100X70X120S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×70 | 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 SCT100X70X120S Is Used
Three-Stop Diverter Gate
Controls a conveyor diverter gate with a home position (0 mm), a partial divert (70 mm), a full divert (120 mm), and a flush-through position (190 mm) for sorting packages to three lanes.
Multi-Depth Pressing
Provides three controlled pressing depths in a light assembly fixture. The 70 mm and 120 mm intermediate stops set pre-compression and final form heights, while full retraction clears the part.
Staged Part Ejection
Ejects parts from a die in two stages—a slow 70 mm push to break stiction, a 120 mm stroke to clear the tool, and full 190 mm extension for a secondary blow-off station, all sensed via the built-in magnet.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X120S the Right Cylinder?
Select the SCT100X70X120S when an application requires three separate extended positions that would otherwise need two individual cylinders and external hard stops. The 100 mm bore provides 3927 N of push per section at 0.5 MPa; if your load is lighter, stepping down to an 80 mm bore (2513 N per section at 0.5 MPa) can reduce air consumption and physical size. For a heavier push, the 100 mm bore is the largest available in the SCT series.
When replacing an existing unit, match the 100 mm bore, both strokes (70 mm and 120 mm), PT port thread, and the built-in magnet (-S suffix). Since the total travel is 190 mm, rod deflection is minimal, but for applications with significant side forces, use an external guide rail to protect the rod gland and bearing.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 70 + 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 SCT100X70X120S FAQ
It provides four discrete mechanical stops: fully retracted (0 mm), first section extended (70 mm), second section extended (120 mm), and both sections extended for total travel (190 mm). You select the position by pressurising the appropriate cylinder ports.
Yes. The -S suffix in the model code indicates a factory-installed magnet band on the piston. This lets you clamp CMSG (reed) or DMSG/EMSG (solid-state) sensors directly onto the tie-rod barrel to detect each of the four stop positions.
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