Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 155mm and 70mm give 4 controllable stop positions across a 225mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 1155 mm
- Stroke 270 mm
- Total travel225 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S
The SCT80X155X70S is an 80 mm bore tandem cylinder that provides four fixed rod positions by combining two piston sections on a single axis. The reachable stops are 0 mm (fully retracted), 70 mm, 155 mm, and the total extended travel of 225 mm. Each actuated section delivers a push force of 2513 N at 0.5 MPa, rising to 4523 N at the maximum operating pressure of 0.9 MPa.
A built-in magnet is integrated into the piston, allowing CMSG, DMSG, or EMSG sensors to be mounted directly on the tie-rod barrel for non-contact position sensing. The 25 mm diameter rod and 28 mm air cushion at each end provide reliable deceleration. This model uses the standard PT port thread and TPU seals for a working range of -20 to +70 °C.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 155 / 70 mm |
| Total travel | 225 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) | 155 mm |
| P2 (section 2) | 70 mm |
| P3 (both extended) | 225 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 SCT80X155X70S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×155 | Stroke 1 (section 1) in mm. |
| ×70 | 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 SCT80X155X70S Is Used
Two-Stage Diverter Gate
Operates a conveyor diverter with a partial-open position at 70 mm for slow-speed sorting and a full-open position at 155 mm for high-throughput routing, with the magnet confirming each gate angle.
Multi-Depth Pressing
Provides a light-contact pre-press stop at 70 mm and a full-force forming stop at 155 mm in a two-stage assembly press, using the 4523 N max thrust per section for final insertion.
Sequential Part Feeding
Advances a feeder mechanism in three discrete steps: a 70 mm push to separate a component, a 155 mm push to transfer it, and the full 225 mm stroke to eject, with sensor feedback at each position.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X155X70S the Right Cylinder?
This four-position SCT configuration is ideal when a process needs a long primary stroke of 155 mm and a shorter secondary stop at 70 mm, eliminating the complexity of two separate actuators and external hard stops. For applications needing higher thrust, stepping up to the SCT100 series provides 3927 N of push force per section at 0.5 MPa. A direct replacement must match the 80 mm bore, both strokes of 155 mm and 70 mm, the PT port thread, and the integrated magnet (-S suffix).
With the longer 155 mm section stroke, ensure the rod is adequately guided if significant side loads are present, as the 25 mm rod may deflect under off-axis forces. Using an external guide or aligning the load axially will maximize bearing life.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 155 + 70 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 SCT80X155X70S FAQ
This model provides four discrete mechanical stops: 0 mm (fully retracted), 70 mm (second section extended), 155 mm (first section extended), and 225 mm (both sections extended). The positions are fixed by the two stroke lengths and are not infinitely adjustable.
The force output is per actuated single piston section. At 0.5 MPa, one section provides 2513 N push and 2268 N pull. Pressurizing both sections does not double the force on the rod; it simply extends the rod to the 225 mm total stroke position. The maximum push force per section at 0.9 MPa is 4523 N.
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