Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 75mm give 4 controllable stop positions across a 200mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 1125 mm
- Stroke 275 mm
- Total travel200 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S
The SCT40X125X75S is a double-acting multi-position tandem cylinder that delivers four distinct rod positions—0 mm, 75 mm, 125 mm, and the combined 200 mm total travel—from two independently controlled piston sections on a single rod line. Each section generates 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), driven through a 16 mm diameter rod with M12x1.25 threads, making it a compact solution for sequenced linear steps.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG solid-state or reed sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke or mid-position signal feedback. With a body length A(SCT) of 235 mm and 21 mm of adjustable air cushion at each end, it provides smooth deceleration across all four stop positions without external shock absorbers.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 125 / 75 mm |
| Total travel | 200 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 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) | 75 mm |
| P3 (both extended) | 200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×125 | Stroke 1 (section 1) in mm. |
| ×75 | 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S Is Used
Two-Stage Diverter Gate
Uses the 75 mm stroke to clear a primary path and the 125 mm stroke to align with a secondary chute, providing four routing options from a single compact actuator on packaging lines.
Multi-Depth Press Insertion
Delivers two controlled insertion depths (75 mm and 125 mm) plus a full 200 mm retract, allowing a single press station to handle components requiring different seating depths without tooling changes.
Sequential Part Staging
Advances parts in two precise increments along a conveyor stop gate; the first 75 mm stroke stages the part, and the second 125 mm stroke releases it, with sensors confirming each discrete position.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S the Right Cylinder?
Choose the SCT40X125X75S when your process needs four fixed mechanical stops without the complexity of servo controls or the bulk of two separate cylinders with external hard stops. The asymmetric 125 mm and 75 mm strokes create a non-linear positioning sequence ideal for two-step feeding or sorting. If your load requires higher thrust, stepping up to the 50 mm bore SCT50X125X75 provides 982 N of push per section at the same 0.5 MPa pressure. For a direct replacement, match the 40 mm bore, both strokes (125 mm and 75 mm), PT port thread, basic mounting, and the -S magnet option; the sensor-ready barrel is integral to the design and cannot be retrofitted to a non-S model.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 125 + 75 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X125X75S FAQ
This tandem cylinder provides four discrete mechanical stops: fully retracted (0 mm), the first section extended (75 mm), the second section extended (125 mm), and both sections extended for the total travel of 200 mm. The positions are fixed by the two stroke lengths and are selected by pressurising the corresponding cylinder section.
Yes, provided the application requires the specific 75 mm and 125 mm stroke sequence on a single rod axis. The SCT40X125X75S consolidates two cylinders into one tie-rod body, saving space and eliminating the need to synchronise two separate actuators. Ensure the replacement matches the 40 mm bore, both strokes, PT ports, basic mounting, and the -S magnet if sensor feedback is needed.
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