Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 25mm and 3mm give 4 controllable stop positions across a 28mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 125 mm
- Stroke 23 mm
- Total travel28 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3
The SCT100X25X3 is a 100 mm bore tandem multi-position cylinder that delivers four fixed rod positions from two independent piston sections: 0 mm (fully retracted), 3 mm, 25 mm, and the combined total travel of 28 mm. Each actuated section generates a push force of 3927 N at 0.5 MPa, rising to 7068 N at the maximum operating pressure of 0.9 MPa, giving the machine designer precise, repeatable short-throw stops without external hard stops.
This tie-rod cylinder uses a 25 mm diameter rod with an M20x1.5 male thread and PT1/2 porting. The adjustable pneumatic cushion at each end (29 mm cushion length) decelerates the piston smoothly, and the body length A(SCT) is 308 mm. It is a double-acting unit built for filtered air at 0.15–1.0 MPa, with a standard temperature range of -20 to +70 °C using TPU seals.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 25 / 3 mm |
| Total travel | 28 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) | 3 mm |
| P3 (both extended) | 28 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 SCT100X25X3
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×25 | Stroke 1 (section 1) in mm. |
| ×3 | 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 SCT100X25X3 Is Used
Two-Depth Shim Insertion
The 3 mm and 25 mm stops allow a vacuum gripper to pick a shim at 0 mm, present it for visual inspection at 3 mm, and fully insert it at 25 mm, with a safe retract at 28 mm total travel.
Micro-Sorting Gate
Use the four discrete positions to direct small parts into three separate chutes. The 3 mm stop provides a narrow gap for thin components, while the 25 mm stop opens fully for larger items.
Calibrated Sensor Targeting
Move a sensor or nozzle to four fixed focal distances (0, 3, 25, 28 mm) for multi-layer inspection or adhesive dispensing, leveraging the high 3927 N push force for stable positioning.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X25X3 the Right Cylinder?
Choose the SCT100X25X3 when a single 100 mm bore actuator must stop at four distinct, short-travel positions for a sorting gate or precision shim insertion. It replaces two separate cylinders or an SC with external mechanical stops, reducing alignment complexity and plumbing. If the 3927 N push per section at 0.5 MPa exceeds your load requirement, stepping down to an 80 mm bore (2513 N push at 0.5 MPa) can lower air consumption while keeping the tandem architecture.
For a drop-in replacement, match the 100 mm bore, both strokes (25 mm and 3 mm), PT port thread, and basic mounting. If your application uses a magnet-equipped SCT100X25X3S with CMSG sensors, ensure the replacement also carries the -S suffix. The short 3 mm stroke section produces minimal rod deflection, but always align the load axially to protect the rod bearing.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 25 + 3 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 SCT100X25X3 FAQ
This tandem cylinder provides four discrete rod positions: 0 mm (fully retracted), 3 mm (section 2 extended), 25 mm (section 1 extended), and 28 mm (both sections extended). The stops are fixed by the two stroke lengths and are not infinitely adjustable.
The SCT100X25X3 integrates two piston sections on a single common rod, guaranteeing coaxial alignment of the four stop positions and reducing the overall footprint. It eliminates the need to synchronise two separate cylinders and their mountings, simplifying the pneumatic circuit to just two directional valves.
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