Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 250mm give 4 controllable stop positions across a 375mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1125 mm
- Stroke 2250 mm
- Total travel375 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250
The SCT80X125X250 tandem cylinder provides four precise, repeatable rod positions without external stops or complex controls. By pressurising either of its two 80 mm bore sections independently or together, the rod locates at 0 mm (fully retracted), 125 mm, 250 mm, or the total travel of 375 mm. Each section generates a substantial 2513 N of push force at 0.5 MPa, making it a powerful actuator for multi-step material handling.
This genuine AirTAC unit features a 25 mm diameter rod and a PT3/8 port, with a body length A of 296 mm. An adjustable air cushion on each end decelerates the 28 mm cushion stroke smoothly, protecting end caps during high-cycle operation. The tie-rod construction is robust and serviceable, suited for demanding factory automation tasks where a single cylinder must replace multiple actuators.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 125 / 250 mm |
| Total travel | 375 mm |
| Stop positions | 4 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 (4)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 125 mm |
| P2 (section 2) | 250 mm |
| P3 (both extended) | 375 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 SCT80X125X250
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×125 | Stroke 1 (section 1) in mm. |
| ×250 | 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 SCT80X125X250 Is Used
Two-Stage Sorting Gate
Direct packages to three different conveyor lanes using the 0 mm, 125 mm, and 375 mm positions. The intermediate 250 mm stop can act as a fourth diverting point for a reject or recirculation line.
Multi-Depth Pressing
Actuate a pressing tool to two different controlled depths in one cycle. The 125 mm and 250 mm extensions allow for a shallow pre-form and a deep final form without changing tooling.
Sequential Part Feeding
Advance a workpiece through a three-step machining or assembly process. The cylinder moves the part from a loading station (0 mm) to station one (125 mm), station two (250 mm), and a final ejection point (375 mm).
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X250 the Right Cylinder?
Select the SCT80X125X250 when your process requires a component to stop at four distinct locations along a 375 mm stroke. This tandem cylinder replaces two separate standard cylinders and a mounting bracket, simplifying the machine layout and reducing the number of directional control valves needed. If your application demands higher force, stepping up to the 100 mm bore SCT series provides 3927 N of push per section at 0.5 MPa. For a lighter, more compact solution, the 63 mm bore offers 1559 N.
For a direct replacement, match the 80 mm bore, both the 125 mm and 250 mm strokes, PT port thread, and basic mounting configuration. With a combined stroke of 375 mm, ensure the load is guided to prevent rod bending or side-loading, which can cause premature seal wear and reduced bearing life.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 125 + 250 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 SCT80X125X250 FAQ
This model provides four discrete mechanical stop positions: 0 mm (fully retracted), 125 mm, 250 mm, and the total extended length of 375 mm. The positions are achieved by pressurizing the first section, the second section, or both sections simultaneously.
No, the SCT is a standard double-acting cylinder and will not hold its position if air pressure is exhausted or lost. The piston can drift or drop under load. To securely hold a position without live pressure, you must add an external rod lock, a mechanical brake, or a pilot-operated check valve to the circuit.
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