Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 40mm give 4 controllable stop positions across a 115mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 175 mm
- Stroke 240 mm
- Total travel115 mm
- Positions4 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S
The AirTAC SCT100X75X40S is a double-acting multi-position cylinder that delivers four distinct rod positions from two piston sections on a single axis. The reachable stops are 0 mm (fully retracted), 75 mm (first section extended), 40 mm (second section extended), and 115 mm (both sections extended). Each actuated section generates a powerful 3927 N 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, allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for non-contact position feedback. The 100 mm bore cylinder uses a 25 mm diameter piston rod with an M20x1.5 male thread and PT1/2 ports. Its robust tie-rod construction has a body length A of 308 mm and an adjustable air cushion length of 29 mm, providing reliable deceleration for the 115 mm total travel.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 75 / 40 mm |
| Total travel | 115 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) | 75 mm |
| P2 (section 2) | 40 mm |
| P3 (both extended) | 115 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 SCT100X75X40S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×75 | Stroke 1 (section 1) in mm. |
| ×40 | 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 SCT100X75X40S Is Used
Two-Stage Diverter Gate
Operates a conveyor diverter with a neutral centre, a partial divert at 40 mm, and a full divert at 75 mm, with the 115 mm position used for a maintenance bypass lane.
Multi-Depth Clamping Fixture
Provides three clamping depths for different workpiece thicknesses in a CNC fixture, using the 40 mm and 75 mm stops, while the 115 mm position fully retracts the clamp for part loading.
Sequential Label Applicator
Positions a tamp pad at 40 mm for a primary label and 75 mm for a secondary label on a single product pass, with the 115 mm combined stroke used for a hard-to-reach recessed surface.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X75X40S the Right Cylinder?
Choose the SCT100X75X40S when you need four fixed mechanical stops without the complexity of two separate cylinders and external hard stops. This tandem unit is more compact and ensures the stops are inherently aligned. If your force requirement is lower, stepping down to the 80 mm bore reduces the per-section push force to 2513 N at 0.5 MPa. For replacement, match the 100 mm bore, both strokes (75 mm and 40 mm), the PT port thread, and the integrated magnet (-S suffix). Since the total stroke is under 300 mm, side-loading from rod deflection is minimal in standard mounting.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 40 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 SCT100X75X40S FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 75 mm (first section extended), 40 mm (second section extended), and 115 mm (both sections extended). The positions are fixed by the two stroke lengths and are selected by pressurising the appropriate cylinder sections.
No, like all standard pneumatic cylinders, the SCT does not lock or hold its position when air pressure is exhausted or lost. The piston will drift if external forces are present. To hold a load at a specific stop without live pressure, you must add an external rod lock, a mechanical brake, or a pilot-operated check valve.
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