Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 300mm give 4 controllable stop positions across a 425mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1125 mm
- Stroke 2300 mm
- Total travel425 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S
The SCT80X125X300S is a tandem multi-position pneumatic cylinder that delivers four fixed rod positions from two independent piston sections on a single axis. With strokes of 125 mm and 300 mm, the reachable stops are 0 mm (fully retracted), 125 mm, 300 mm, and the combined total travel of 425 mm. Each 80 mm bore section generates 2513 N of push force at 0.5 MPa, making this unit a robust actuator for sequenced material handling where distinct, repeatable stop points are required.
This model includes a factory-installed magnetic piston ring, designated by the -S suffix, enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for non-contact position feedback. The cylinder body has an A(SCT) dimension of 296 mm, uses a 25 mm diameter piston rod with an M20x1.5 male thread, and features PT3/8 ports. Its adjustable pneumatic end cushion on both sections provides smooth deceleration across the 30-800 mm/s speed range.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 125 / 300 mm |
| Total travel | 425 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) | 125 mm |
| P2 (section 2) | 300 mm |
| P3 (both extended) | 425 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 SCT80X125X300S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×125 | Stroke 1 (section 1) in mm. |
| ×300 | 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 SCT80X125X300S Is Used
Two-Stage Diverter Gate
Controls a diverter chute with four positions: home, partial open at 125 mm for fine sorting, full open at 300 mm for bulk flow, and a 425 mm bypass position when both sections are pressurized.
Multi-Depth Pallet Stop
Provides three distinct pallet stop heights in a conveyor lane. The 125 mm stop engages low-profile pallets, the 300 mm stop handles standard pallets, and the 425 mm total extension acts as a full lane block.
Sequential Clamping Fixture
Operates a two-step welding fixture clamp. The first 125 mm stroke applies a light pre-clamp force, while the second 300 mm stroke delivers full clamping pressure, with sensor confirmation at each position via the built-in magnet.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X125X300S the Right Cylinder?
Selecting the SCT80X125X300S is ideal when a machine axis needs four hard stops without the complexity of servo control or multiple separate actuators. The 125 mm and 300 mm stroke combination creates a 425 mm total travel, useful for two-stage feeding or diverting where the intermediate 125 mm and 300 mm positions are process-critical. If higher force is needed, stepping up to the 100 mm bore provides 3927 N of push per section at 0.5 MPa, though the body length increases to 308 mm. For a lighter load, the 63 mm bore offers 1559 N per section.
When replacing this cylinder, match the 80 mm bore, both the 125 mm and 300 mm section strokes, and the PT3/8 port thread. The S suffix is essential if your application relies on barrel-mounted sensors for end-of-stroke or mid-position confirmation. Since the 300 mm section stroke introduces a longer extended rod length, evaluate the guided load for side forces and consider an external guide or rod support if the load is not purely axial.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 125 + 300 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 SCT80X125X300S FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 125 mm (section one extended), 300 mm (section two extended), and 425 mm (both sections extended, total travel). These positions are fixed by the two stroke lengths and are selected by pressurizing the corresponding piston sections.
Yes, specifically because this is the SCT80X125X300S variant with the -S magnet suffix. The built-in magnetic ring allows AirTAC's CMSG, DMSG, or EMSG series sensors to be clamped directly onto the cylinder's tie-rods for detecting each of the four positions. A non-S version lacks this magnet and cannot use barrel-mounted sensors.
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