Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 250mm and 25mm give 4 controllable stop positions across a 275mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1250 mm
- Stroke 225 mm
- Total travel275 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S
The SCT80X250X25S is a tandem multi-position cylinder that delivers four discrete rod positions from two independently controlled piston sections. With strokes of 250 mm and 25 mm, the reachable stops are 0 mm (fully retracted), 25 mm, 250 mm, and the total travel of 275 mm, giving machine designers a compact way to handle a long primary stroke with a short secondary positioning step.
Equipped with a built-in magnet (-S suffix), this model accepts CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for non-contact position feedback. Each 80 mm bore section produces 2513 N of push force at 0.5 MPa and up to 4523 N at the maximum operating pressure of 0.9 MPa. The 25 mm diameter piston rod, PT3/8 ports, and 28 mm adjustable air cushion at each end cap ensure reliable cycling and end-of-stroke deceleration.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 250 / 25 mm |
| Total travel | 275 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) | 250 mm |
| P2 (section 2) | 25 mm |
| P3 (both extended) | 275 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 SCT80X250X25S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×250 | Stroke 1 (section 1) in mm. |
| ×25 | 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 SCT80X250X25S Is Used
Two-Depth Pressing
The long 250 mm stroke advances a press platen rapidly to a pre-press position, while the short 25 mm stroke applies the final controlled pressing depth, creating a two-stage forming cycle with one compact actuator.
Diverting Gate with Offset
Use the 250 mm stroke to move a diverter gate between two main conveyor lanes and the 25 mm stroke to fine-tune the gate's edge position, ensuring flush alignment without manual adjustment.
Multi-Stop Clamping
Clamp a family of parts with two distinct thicknesses: the 25 mm stroke sets the jaw opening for thin parts, and the 250 mm stroke retracts fully to accommodate a thicker workpiece, selectable via valve control.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X250X25S the Right Cylinder?
Choose this SCT configuration when your process requires a long 250 mm transfer or clamping stroke followed by a precise 25 mm secondary positioning move—all on a single rod line, which eliminates the alignment complexity of two separate cylinders. If the 2513 N per-section push force at 0.5 MPa is insufficient, stepping up to the 100 mm bore SCT100X250X25 provides 3927 N per section; for a lighter load, the 63 mm bore delivers 1559 N per section.
For direct replacement, match an AirTAC SCT80 with both 250 mm and 25 mm section strokes, PT port thread, basic mounting, and the -S magnet option. Because the 250 mm section stroke is substantial, ensure the rod assembly is adequately guided if the load applies a significant side force, to prevent rod bending or premature bearing wear.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 250 + 25 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 SCT80X250X25S FAQ
It provides four distinct mechanical stops: 0 mm (fully retracted), 25 mm (section 2 extended), 250 mm (section 1 extended), and 275 mm (both sections extended, which is the total of the two strokes). The positions are selected by pressurizing the appropriate combination of the two piston sections.
No, this is a standard pneumatic cylinder and will drift or drop if pressure is exhausted or a directional valve is centered. To hold a load at one of the discrete stops without live pressure, you must add an external mechanical rod lock, a pilot-operated check valve, or a brake unit to the system.
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