Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 25mm and 125mm give 4 controllable stop positions across a 150mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 125 mm
- Stroke 2125 mm
- Total travel150 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S
The SCT100X25X125S is a 100 mm bore tandem multi-position cylinder that provides four fixed rod positions: fully retracted (0 mm), 25 mm, 125 mm, and the total extended travel of 150 mm. Each piston section delivers a powerful push force of 3927 N at 0.5 MPa, scaling up to 7068 N at the maximum operating pressure of 0.9 MPa, making it suitable for heavy-duty sorting or multi-stop material handling.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for non-contact position feedback. The cylinder features a 25 mm diameter rod, PT1/2 ports, and a body length A(SCT) of 308 mm, with an adjustable air cushion length of 29 mm to manage end-of-stroke deceleration.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 25 / 125 mm |
| Total travel | 150 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) | 25 mm |
| P2 (section 2) | 125 mm |
| P3 (both extended) | 150 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 SCT100X25X125S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×25 | Stroke 1 (section 1) in mm. |
| ×125 | 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 SCT100X25X125S Is Used
Two-Stage Part Diverter
Actuates a gate to three positions—closed, partially open to a first lane (25 mm), and fully open to a second lane (150 mm)—for routing packages on a conveyor line.
Dual-Depth Clamping
Provides two distinct clamping pressures or depths for holding workpieces of different thicknesses during an automated welding or assembly sequence.
Multi-Stop Pusher
Pushes a product off a line at a 25 mm stroke for one SKU and a full 150 mm stroke for a wider SKU, controlled by pressurizing the individual cylinder sections.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X125S the Right Cylinder?
Selecting this SCT configuration is ideal when an application requires two distinct extended positions without the complexity of two separate actuators and external hard stops. The 25 mm and 125 mm strokes provide a short advance for a first operation and a longer advance for a second, all on a single rigid rod line. If higher force is needed, the 100 mm bore is the largest in the SCT range; for a lighter, more compact solution, consider stepping down to an 80 mm bore which provides 2513 N of push per section at 0.5 MPa.
For a direct replacement, match the 100 mm bore, both strokes (25 mm and 125 mm), PT port thread, basic mounting, and the integrated magnet option (-S). Since the longer stroke section is under 300 mm, rod buckling is typically not a primary concern, but always ensure the load is guided if there is any off-axis weight.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 25 + 125 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 SCT100X25X125S FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 25 mm (first section extended), 125 mm (second section extended), and 150 mm (both sections extended, which is the sum of the two strokes). The positions are fixed by the stroke lengths and are not infinitely adjustable.
No, it cannot. Like all standard pneumatic cylinders, the SCT does not have a mechanical locking or brake feature. If air pressure is lost or a control valve centers, the piston rod will drift or drop under load. To safely hold a position without live pressure, you must add an external rod lock or a pilot-operated check valve.
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