Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 40mm and 20mm give 4 controllable stop positions across a 60mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 140 mm
- Stroke 220 mm
- Total travel60 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S
The SCT80X40X20S is an 80 mm bore multi-position pneumatic cylinder that delivers four discrete rod stops—0 mm, 40 mm, 20 mm, and the combined 60 mm total travel—by pressurising its two tandem piston sections independently or together. Each section generates a push force of 2513 N at 0.5 MPa, rising to 4523 N at the maximum 0.9 MPa operating pressure, driven through a rigid 25 mm diameter piston rod.
This specific model includes a built-in magnet (denoted by the -S suffix), allowing CMSG, DMSG, or EMSG solid-state and reed sensors to be clamped directly onto the tie-rod barrel for non-contact position confirmation at any of the four stops. The cylinder body has an A-length of 296 mm, features a PT3/8 port, and uses an adjustable pneumatic cushion with a 28 mm length to decelerate the load smoothly at both ends of the 60 mm total stroke.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 40 / 20 mm |
| Total travel | 60 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) | 40 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 60 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 SCT80X40X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×40 | 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 SCT80X40X20S Is Used
Two-Stage Diverter Gate
Uses the 0, 20, 40, and 60 mm positions to route packages to four separate conveyor lanes from a single infeed point, with the magnet confirming each gate position.
Multi-Depth Insertion
Pushes components to two different controlled depths (20 mm and 40 mm) in a press-fit or assembly station, with the 0 and 60 mm positions serving as home and clear.
Sequential Part Staging
Stages parts at a 20 mm pick point and a 40 mm placement point in a pick-and-place sequence, eliminating the need for a two-axis slide on a simple transfer.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X40X20S the Right Cylinder?
Choose the SCT tandem cylinder when your process requires a single, compact actuator to index to multiple fixed positions instead of linking two separate cylinders or adding external hard stops to a standard unit. The 80 mm bore provides substantial force for medium-to-heavy payloads; if your load is lighter, stepping down to a 63 mm bore SCT reduces the per-section push force to 1559 N at 0.5 MPa, while moving up to a 100 mm bore increases it to 3927 N. For replacement, match the 80 mm bore, both the 40 mm and 20 mm stroke sections, the PT3/8 port thread, and the integrated magnet sensor option exactly.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 40 + 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 SCT80X40X20S FAQ
This tandem cylinder provides four discrete positions: fully retracted (0 mm), first section extended (40 mm), second section extended (20 mm), and both sections extended for the total travel (60 mm). The built-in magnet allows you to verify each stop with a barrel-mounted sensor.
The SCT80X40X20S integrates two strokes into one compact, tie-rod body, saving space and eliminating the need to align and plumb two separate actuators. It gives you fixed 20 mm, 40 mm, and 60 mm positions from a single mounting footprint, with a common 25 mm rod and PT3/8 porting.
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