Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 125mm give 4 controllable stop positions across a 200mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 175 mm
- Stroke 2125 mm
- Total travel200 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S
The SCT80X75X125S is an 80 mm bore multi-position pneumatic cylinder that delivers four distinct rod positions without external stops. By pressurising its two tandem piston sections independently, the rod locates at 0 mm (fully retracted), 75 mm, 125 mm, or the combined 200 mm total travel. Each actuated section generates a push force of 2513 N at 0.5 MPa, rising to 4523 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for end-of-stroke or mid-position confirmation. The 25 mm diameter rod, PT3/8 ports, and 28 mm adjustable air cushion at each end provide reliable deceleration. The body length A(SCT) is 296 mm, making it compact enough for multi-stop feeding or diverting stations where space is limited.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 75 / 125 mm |
| Total travel | 200 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) | 125 mm |
| P3 (both extended) | 200 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 SCT80X75X125S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×75 | 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 SCT80X75X125S Is Used
Four-Way Part Diverting
Direct packages to four separate conveyor lanes by stopping the rod at 0, 75, 125, or 200 mm. The magnet confirms each position before the next cycle starts.
Multi-Depth Pressing
Insert components to two different depths in one station. The 125 mm stroke sets the first depth, and pressurising both sections drives the tool to the full 200 mm depth.
Staged Material Feed
Advance strip material in two controlled steps. The 75 mm section indexes the material, and the 125 mm section completes the feed, with sensor feedback at each position.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X75X125S the Right Cylinder?
Choose the SCT80X75X125S when your process needs a single actuator to reach four fixed positions instead of linking two separate cylinders. The 80 mm bore provides 2513 N of push per section at 0.5 MPa, which suits medium-force sorting gates and multi-level clamping. If your load is lighter, stepping down to a 63 mm bore (1559 N push at 0.5 MPa) can reduce air consumption while still offering the same four-position logic.
For direct replacement, match an AirTAC SCT of 80 mm bore with 75 mm and 125 mm section strokes, PT3/8 ports, and the -S magnet option. Since the longer combined stroke reaches 200 mm, ensure the rod is guided externally if the load applies significant side force, as the 25 mm rod may deflect under off-axis loads at full extension.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 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 SCT80X75X125S FAQ
This tandem cylinder provides four discrete mechanical stop positions: 0 mm (fully retracted), 75 mm, 125 mm, and the full 200 mm extension. The positions are fixed by the two section strokes and are not infinitely adjustable.
No, the SCT cylinder does not lock or hold its position when air pressure is removed or exhausted. The piston will drift. If you need to hold a load at the 75 mm or 125 mm position without live pressure, you must add an external rod brake or a pilot-operated check valve.
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