Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 50mm and 70mm give 4 controllable stop positions across a 120mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 150 mm
- Stroke 270 mm
- Total travel120 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70
The SCT80X50X70 tandem cylinder delivers four fixed rod positions—0 mm, 50 mm, 70 mm, and the combined 120 mm stroke—from a single compact assembly. Each 80 mm bore piston section generates 2513 N of push force at 0.5 MPa, making it suitable for diverting or sorting tasks that need two distinct mid-stroke stops without extra actuators.
Built on a rugged tie-rod design with a 25 mm diameter rod and PT3/8 ports, the cylinder uses adjustable air cushioning (28 mm cushion length) to manage end-of-stroke deceleration. The body length A is 296 mm, and the unit operates reliably from 0.15 to 1.0 MPa with TPU seals rated for -20 to +70 °C.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 50 / 70 mm |
| Total travel | 120 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) | 50 mm |
| P2 (section 2) | 70 mm |
| P3 (both extended) | 120 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 SCT80X50X70
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×50 | 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 SCT80X50X70 Is Used
Two-Way Part Diverting
Use the four positions (0, 50, 70, 120 mm) to route packages to three separate conveyor lanes from one infeed point, actuated by sequencing pressure to each piston section.
Multi-Depth Pressing
Achieve two distinct pressing depths in one cycle. The 50 mm and 70 mm intermediate stops allow a single cylinder to perform a shallow pre-form and a deeper final form without tooling changes.
Staged Material Feeding
Control a gate or stop pin with four precise positions to meter material flow. The discrete 50 mm and 70 mm steps provide repeatable partial-open states for batching operations.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X70 the Right Cylinder?
Choose the SCT80X50X70 when a process requires four discrete stopping points along a single linear axis, eliminating the cost and complexity of two separate cylinders with external hard stops. If the 2513 N push force at 0.5 MPa is insufficient, stepping up to the 100 mm bore provides 3927 N per section; for a lighter load, the 63 mm bore delivers 1559 N.
For a drop-in replacement, match the 80 mm bore, both 50 mm and 70 mm section strokes, PT port thread, and basic mounting configuration. When ordering a direct substitute, ensure the replacement unit carries the identical SCT model code. For strokes exceeding 300 mm, consider external guide rods to protect the 25 mm piston rod from side-load deflection.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 50 + 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 SCT80X50X70 FAQ
This tandem cylinder provides four discrete rod positions: fully retracted (0 mm), first section extended (50 mm), second section extended (70 mm), and both sections extended for the total travel of 120 mm. The stops are fixed by the two stroke lengths and are not infinitely adjustable.
No, the SCT cylinder does not mechanically lock at any position. If air pressure is exhausted or a directional valve centers, the piston can drift. To hold a load at a mid-stroke position without live pressure, you must add an external rod brake or a pilot-operated check valve in the circuit.
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