Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 80mm and 20mm give 4 controllable stop positions across a 100mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 180 mm
- Stroke 220 mm
- Total travel100 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S
The SCT80X80X20S tandem cylinder provides four discrete rod positions from two strokes on a single piston rod line. With an 80 mm bore, the reachable stops are 0 mm (fully retracted), 80 mm, 20 mm, and the total travel of 100 mm, selected by pressurising either or both piston sections independently.
Each section delivers 2513 N of push force at 0.5 MPa, rising to 4523 N at the maximum operating pressure of 0.9 MPa. The 25 mm diameter rod and 28 mm adjustable air cushion at each end cap handle end-of-stroke deceleration reliably. The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for position feedback without extra brackets.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 80 / 20 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) | 80 mm |
| P2 (section 2) | 20 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 SCT80X80X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×80 | Stroke 1 (section 1) in mm. |
| ×20 | 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 SCT80X80X20S Is Used
Two-Depth Part Insertion
The 80 mm primary stroke advances a tool to a clearance position, and the 20 mm secondary stroke performs the final press-fit. The four distinct stops let the cylinder retract fully, pause at the clearance height, or extend to the full 100 mm insertion depth.
Diverter Gate with Bypass
Use the 0 mm, 20 mm, 80 mm, and 100 mm positions to route packages to three lanes. The short 20 mm stroke cracks the gate for a low-profile divert, while the 80 mm stroke opens it fully for a straight-through path.
Multi-Stop Clamping Fixture
Clamp a family of parts with two different thicknesses without changing tooling. The 20 mm stroke closes on thin workpieces, the 80 mm stroke clamps thicker ones, and the combined 100 mm stroke provides an open, load-ready position.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X80X20S the Right Cylinder?
This 4-position actuator replaces setups that would otherwise need two separate cylinders with external hard stops and sequencing valves, saving space and simplifying pneumatic circuitry. The 80/20 mm stroke combination is well suited to applications where a short secondary advance follows a longer primary feed, such as a two-depth pressing or a diverter gate with a partial bypass position. If your force requirement is lower, stepping down to the 63 mm bore reduces per-section push to 1559 N at 0.5 MPa; for higher thrust, the 100 mm bore provides 3927 N per section.
When ordering a direct replacement, match the 80 mm bore, both the 80 mm and 20 mm section strokes, the PT port thread, and the -S magnet option. The basic mounting configuration uses the tie-rod extensions for direct mounting; FA, FB, CA, CB, or LB brackets can be added if panel, flange, clevis, or foot mounting is required.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 80 + 20 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 SCT80X80X20S FAQ
It provides four discrete mechanical stops: 0 mm (fully retracted), 80 mm (first section extended), 20 mm (second section extended), and 100 mm (both sections extended, total travel). The stops are fixed by the two stroke lengths and are not infinitely adjustable.
No. Like all standard pneumatic cylinders, the SCT80X80X20S will drift or drop if supply pressure is lost or the directional valve is centred, as the air cushion does not act as a mechanical lock. If a load must be held at a mid-position without live pressure, you need an external rod brake, a pilot-operated check valve, or a mechanical locking unit.
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