Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 250mm and 55mm give 4 controllable stop positions across a 305mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 1250 mm
- Stroke 255 mm
- Total travel305 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S
The SCT100X250X55S is a tandem multi-position cylinder that provides four distinct rod positions: 0 mm (fully retracted), 55 mm, 250 mm, and a total extended travel of 305 mm. Each piston section generates a powerful 3927 N of push force at 0.5 MPa, making it suitable for heavy-duty sorting or multi-stage clamping where a single actuator must reach two different extended stops.
This model includes a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to be mounted directly on the tie-rod barrel for reliable end-of-stroke or mid-position sensing. The 100 mm bore cylinder uses a 25 mm diameter rod with an M20x1.5 thread, PT1/2 ports, and a 29 mm adjustable air cushion, with a total body length A(SCT) of 308 mm.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 250 / 55 mm |
| Total travel | 305 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) | 250 mm |
| P2 (section 2) | 55 mm |
| P3 (both extended) | 305 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 SCT100X250X55S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×250 | Stroke 1 (section 1) in mm. |
| ×55 | 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 SCT100X250X55S Is Used
Two-Way Part Diverting
Uses the 55 mm and 250 mm stops to guide parts down two different conveyor lanes, activated by pressurizing the appropriate cylinder section.
Multi-Depth Press Operation
Provides a primary press stroke to 250 mm and a secondary, shallower pressing or pre-load position at 55 mm for two-stage assembly processes.
Staged Clamping Fixture
Offers an initial 55 mm travel for low-force part location, followed by a full 305 mm extension for high-force clamping, all from one compact actuator.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X250X55S the Right Cylinder?
An SCT tandem cylinder is the right choice when a machine design requires two fixed, repeatable extended positions from a single pneumatic actuator, eliminating the complexity and cost of mounting two separate cylinders. For this 100 mm bore model, if the per-section push force of 3927 N is more than required, consider stepping down to an 80 mm bore SCT, which provides 2513 N of push force per section at the same pressure. A direct replacement must match the 100 mm bore, both the 250 mm and 55 mm strokes, PT port thread, basic mounting, and the integrated magnet (-S suffix).
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 250 + 55 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 SCT100X250X55S FAQ
This cylinder provides 4 discrete mechanical stops: 0 mm (fully retracted), 55 mm, 250 mm, and 305 mm (the sum of both strokes). The positions are fixed by the two piston sections and are not infinitely adjustable.
Yes, it can often replace two single-stroke cylinders in a tandem setup, provided the required strokes are exactly 250 mm and 55 mm. The replacement must have a 100 mm bore, PT ports, basic mounting, and a built-in magnet to match the -S suffix on this model.
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