Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 25mm give 4 controllable stop positions across a 100mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 175 mm
- Stroke 225 mm
- Total travel100 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25
The SCT80X75X25 is an 80 mm bore tandem cylinder delivering four fixed rod positions: 0 mm, 25 mm, 75 mm, and the combined 100 mm total travel. By pressurising the two piston sections independently or together, you get repeatable mechanical stops without external hard stops or complex servo controls. Each section generates 2513 N of push force at 0.5 MPa, rising to 4523 N at 0.9 MPa, driven through a rigid 25 mm diameter rod.
This tie-rod cylinder uses adjustable pneumatic cushioning with a 28 mm cushion length to decelerate the load at each end of the combined stroke. The body length A is 296 mm, making it compact for an 80 mm bore multi-stop actuator. Standard PT3/8 ports and M20x1.5 rod threads simplify pneumatic connections and tooling attachment. The default TPU seals suit ambient temperatures from -20 to +70 °C.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 75 / 25 mm |
| Total travel | 100 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) | 75 mm |
| P2 (section 2) | 25 mm |
| P3 (both extended) | 100 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 SCT80X75X25
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×75 | Stroke 1 (section 1) in mm. |
| ×25 | 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 SCT80X75X25 Is Used
Two-Stage Sorting Gate
Use the 25 mm and 75 mm stops to divert packages onto two separate conveyor lanes from a single retracted home position, simplifying multi-lane sortation.
Sequential Part Feeding
The 0, 25, 75, and 100 mm positions allow a feeder to stage components at two different pick points, enabling a robot to alternate between part types without a tool change.
Two-Depth Press Assist
Achieve a light pre-press at the 75 mm stop and a full-depth insertion at 100 mm total travel, controlling two assembly steps with one compact pneumatic actuator.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X25 the Right Cylinder?
Choose the SCT80X75X25 when your process needs two distinct intermediate positions plus full retract and extend, avoiding the cost and complexity of two separate cylinders with external stops. If your force requirement is lower, the 63 mm bore SCT63X75X25 provides 1559 N push per section at 0.5 MPa in a slightly smaller envelope. For higher thrust demands, the 100 mm bore delivers 3927 N per section at the same pressure.
As a direct replacement, match an existing SCT unit by confirming the 80 mm bore, both strokes (75 mm and 25 mm), PT3/8 ports, and basic mounting. If the original includes a magnet for sensors, order the -S variant. The 25 mm rod is robust, but for the 75 mm stroke section, ensure the load is guided if side forces are present to prevent rod bending and premature seal wear.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 25 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 SCT80X75X25 FAQ
This 4-position cylinder stops at 0 mm (fully retracted), 25 mm (second section extended), 75 mm (first section extended), and 100 mm (both sections extended). The positions are discrete and fixed by the two stroke lengths, not infinitely adjustable.
Yes, it often can. It provides three controlled extension points from a single rod line, eliminating the need to synchronise two actuators. To replace an existing SCT, match the 80 mm bore, the 75 mm and 25 mm strokes, PT3/8 ports, and basic mounting. A magnet-equipped (-S) version is needed if you use barrel-mounted sensors.
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