Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 125mm give 3 controllable stop positions across a 250mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1125 mm
- Stroke 2125 mm
- Total travel250 mm
- Positions3 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125
The SCT80X125X125 is a double-acting tandem cylinder that delivers three fixed rod positions: fully retracted (0 mm), mid-stop at 125 mm, and fully extended at 250 mm. Both piston sections share an 80 mm bore and a 25 mm diameter rod, with PT3/8 ports and a 28 mm adjustable air cushion at each end. At 0.5 MPa, a single section generates 2513 N of push force, making it suitable for medium-duty sorting or diverting tasks.
This tie-rod cylinder has a body length A(SCT) of 296 mm plus strokes, and operates on standard filtered air between 0.15 and 1.0 MPa. The TPU seals suit ambient temperatures from -20 to +70 °C. Because the two strokes are equal, the actuator provides three distinct mechanical stops without needing external hard stops or two separate cylinders, simplifying plumbing and control logic.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125 Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 125 / 125 mm |
| Total travel | 250 mm |
| Stop positions | 3 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 (3)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 125 mm |
| P2 (both extended) | 250 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 SCT80X125X125
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×125 | Stroke 1 (section 1) in mm. |
| ×125 | 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 SCT80X125X125 Is Used
3-Way Diverter Gates
The three fixed positions (0, 125, 250 mm) actuate a flap or gate to direct parts into left, center, or right chutes on a conveyor line, eliminating the need for two separate cylinders and sequencing valves.
Two-Depth Press Operations
Extend the rod to the 125 mm mid-stop for a light pre-forming stroke, then pressurize both sections to reach the full 250 mm travel for final forming, achieving two pressing depths with one compact actuator.
Multi-Stop Material Stops
Use the retracted, mid, and extended positions as adjustable hard stops for pallets or trays on a roller bed, providing three distinct indexing locations without complex servo controls.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X125 the Right Cylinder?
Choose the SCT80X125X125 when your application needs three positive stop locations and a push force around 2513 N per section at standard plant pressure. If your load requires more thrust, stepping up to the 100 mm bore delivers 3927 N push at the same 0.5 MPa; for a lighter, more compact solution, the 63 mm bore offers 1559 N push. The SCT replaces two individual SC cylinders and external stop hardware in a single, pre-aligned assembly.
For a drop-in replacement, match the 80 mm bore, both 125 mm strokes, PT3/8 ports, and the basic mounting configuration. If you need sensor feedback, specify the -S magnet option to mount CMSG or DMSG switches directly on the tie-rod barrel. Note that with a combined travel of 250 mm, ensure the rod is guided if significant side loads are present to prevent bending.
Multi-position checklist
- ✓ Need 3 repeatable stops?
- ✓ Section strokes 125 + 125 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 SCT80X125X125 FAQ
It provides three distinct mechanical stop positions because both stroke sections are equal at 125 mm. The rod stops at 0 mm (fully retracted), 125 mm (first section extended), and 250 mm (both sections extended).
Yes, it is designed to replace two individual SC80X125 cylinders in applications requiring three fixed positions. It uses a common rod and body, which saves space and simplifies air plumbing. Ensure the replacement matches the 80 mm bore, 125 mm strokes, PT3/8 ports, and basic mounting.
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