Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 20mm and 20mm give 3 controllable stop positions across a 40mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 120 mm
- Stroke 220 mm
- Total travel40 mm
- Positions3 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S
The SCT40X20X20S is a tandem multi-position cylinder that delivers three fixed rod positions—fully retracted (0 mm), extended to the first stroke (20 mm), and fully extended to the combined travel (40 mm). Each 40 mm bore piston section generates 628 N of push force at 0.5 MPa, making it a compact solution for light sorting or diverting tasks where two distinct extended stops are needed without complex controls.
Equipped with a built-in magnet (-S suffix), this model accepts CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for reliable end-of-stroke or mid-position sensing. The 16 mm diameter rod and 21 mm adjustable air cushion at each end provide smooth deceleration, while the PT1/4 port and M12x1.25 rod thread keep integration straightforward. The body length A(SCT) is 235 mm.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 20 / 20 mm |
| Total travel | 40 mm |
| Stop positions | 3 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 (3)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 20 mm |
| P2 (both extended) | 40 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 SCT40X20X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×20 | 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S Is Used
Two-Way Part Diverting
Uses the 20 mm and 40 mm stroke positions to guide small parts into two separate chutes on a conveyor line, with magnetic sensors confirming the gate position at each stop.
Multi-Level Pusher
Advances a pusher plate to a pre-stop at 20 mm for alignment, then to the full 40 mm stroke to eject the workpiece, all from one compact tandem cylinder.
Two-Depth Pressing
Provides a light touch at the 20 mm position for component placement, followed by a full 40 mm extension for a press-fit operation, with sensor feedback at each depth.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S the Right Cylinder?
Choose the SCT40X20X20S when your application requires two fixed extended positions from a single compact actuator, eliminating the need for two separate cylinders and their mounting hardware. If higher force is needed, stepping up to the 50 mm bore SCT50X20X20 provides 982 N of push per section at 0.5 MPa. For a direct replacement, match the 40 mm bore, both 20 mm strokes, PT port thread, basic mounting, and the -S magnet option; the SCT is a tie-rod design and does not interchange with ISO 15552 profiles.
Multi-position checklist
- ✓ Need 3 repeatable stops?
- ✓ Section strokes 20 + 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X20S FAQ
It provides 3 discrete mechanical stops: 0 mm (fully retracted), 20 mm (first section extended), and 40 mm (both sections extended, total travel). Because both strokes are equal at 20 mm, the 20 mm and 20 mm positions coincide, giving three unique rod locations.
Yes, if your sequence needs only the 20 mm and 40 mm extended positions. The SCT40X20X20S combines both strokes on one common rod line, saving space and reducing the number of valves and fittings compared to two individual cylinders. Ensure the per-section force of 628 N at 0.5 MPa meets your load requirement at each stop.
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