Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 70mm and 20mm give 4 controllable stop positions across a 90mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 170 mm
- Stroke 220 mm
- Total travel90 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S
The SCT100X70X20S is a double-acting multi-position cylinder delivering four distinct rod positions: 0 mm (fully retracted), 70 mm, 20 mm, and the combined total travel of 90 mm. This tandem design integrates two piston sections on a single 25 mm rod line, offering a compact solution for sequencing tasks that require multiple fixed stops without complex servo controls. Each actuated section provides a powerful 3927 N of push force at 0.5 MPa, rising to 7068 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (denoted by the 'S' suffix), allowing for direct mounting of CMSG, DMSG, or EMSG sensors to detect piston position. The cylinder body has a length of 308 mm and features a PT1/2 port size with an M20x1.5 rod thread. Equipped with an adjustable pneumatic cushion (29 mm length), it ensures smooth deceleration at the end of each stroke, making it ideal for high-cycle, multi-stop material handling or sorting applications where position feedback is required.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 70 / 20 mm |
| Total travel | 90 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/2 |
| 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, 29 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) | 70 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 90 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SCT100X70X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×70 | 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 SCT100X70X20S Is Used
Two-Way Diverter Gate
Uses the four discrete positions (0, 70, 20, 90 mm) to actuate a diverter chute, routing packages to two separate conveyor lines from a single feed point with high reliability.
Multi-Depth Pressing
Provides three distinct pressing depths for a forming operation—retracted (0 mm), a shallow pre-form (20 mm), and a full-depth press (90 mm)—controlled entirely by pneumatic valving.
Staged Clamping Fixture
Executes a two-step clamping sequence: a low-force initial position (70 mm) to locate a part, followed by a high-force final clamp at the full 90 mm stroke, with sensor confirmation at each step via the built-in magnet.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X70X20S the Right Cylinder?
Selecting an SCT multi-position cylinder is ideal when an application requires two or three discrete mechanical stops without the cost and complexity of a servo-electric actuator. This 100 mm bore model is a high-force option; if your application requires less thrust, consider stepping down to an 80 mm bore SCT, which provides 2513 N of push force per section at 0.5 MPa. For a direct replacement, ensure the new unit matches the 100 mm bore, both strokes (70 mm and 20 mm), the PT port thread, the basic mounting style, and the integrated magnet ('S' suffix) for sensor compatibility. Since the longest section stroke is 70 mm, side-loading and rod bending are minimal, but always ensure the load is guided if any radial forces are present.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 70 + 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 SCT100X70X20S FAQ
This tandem cylinder provides four discrete mechanical stops. The rod positions are 0 mm (fully retracted), 70 mm (first section extended), 20 mm (second section extended), and 90 mm (both sections extended, which is the sum of the two strokes).
The force is generated per actuated piston section, not as a combined total. Each section provides 3927 N of push force at 0.5 MPa. You do not double the force when moving to the 90 mm position; the thrust remains the single-section value, as the sections are pneumatically linked in series on the same rod.
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