Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 45mm and 70mm give 4 controllable stop positions across a 115mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 145 mm
- Stroke 270 mm
- Total travel115 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70
The SCT80X45X70 is a double-acting multi-position cylinder that provides four fixed rod positions: 0 mm (fully retracted), 45 mm, 70 mm, and 115 mm (total travel). By pressurising the two piston sections independently or together, it replaces complex setups of multiple cylinders and external stops with a single, compact tandem unit. Each 80 mm bore section generates 2513 N of push force at 0.5 MPa, rising to 4523 N at the maximum operating pressure of 0.9 MPa.
This model features a 25 mm diameter piston rod with an M20x1.5 thread and PT3/8 ports. The adjustable pneumatic cushion at each end, with a 28 mm cushion length, decelerates the load smoothly across all four stop positions. The body length A(SCT) is 296 mm, making it a space-efficient solution for multi-stop linear tasks without the need for external sensors or programmable controllers.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 45 / 70 mm |
| Total travel | 115 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) | 45 mm |
| P2 (section 2) | 70 mm |
| P3 (both extended) | 115 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 SCT80X45X70
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×45 | Stroke 1 (section 1) in mm. |
| ×70 | 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 SCT80X45X70 Is Used
Two-Way Diverter Gates
Use the 45 mm and 70 mm strokes to align a chute or gate with two separate conveyor lanes, directing product flow without needing two actuators.
Two-Depth Pressing
Achieve a partial pre-compression at 45 mm and a full-depth press at 115 mm in assembly fixtures, ensuring consistent force at each stage from the 80 mm bore.
Multi-Stop Part Feeding
Advance parts to a 45 mm staging position, then to a 70 mm inspection point, and finally to a 115 mm ejection station with a single SCT cylinder.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X45X70 the Right Cylinder?
Choose the SCT80X45X70 when a process requires two distinct extension depths plus a home position, such as a two-stage pressing or a diverter gate with a bypass lane. The tandem design is more compact and cost-effective than installing two separate 80 mm bore cylinders with external hard stops. If the 2513 N push force per section at 0.5 MPa is insufficient, stepping up to the 100 mm bore SCT100 series provides 3927 N per section. For a direct replacement, match the 80 mm bore, both 45 mm and 70 mm strokes, PT3/8 ports, and basic mounting. If a section stroke exceeds 300 mm, consider external guides to prevent rod buckling under side loads.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 45 + 70 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 SCT80X45X70 FAQ
It provides four distinct mechanical stops: 0 mm (fully retracted), 45 mm, 70 mm, and 115 mm (full extension). These are achieved by pressurising the front section, rear section, or both simultaneously.
Yes, if the application requires two fixed extension points. The tandem SCT design eliminates the need for dual mounting brackets, external hard stops, and synchronisation circuits, saving space and simplifying the pneumatic layout.
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