Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 20mm and 40mm give 4 controllable stop positions across a 60mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 120 mm
- Stroke 240 mm
- Total travel60 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S
The SCT40X20X40S is a double-acting multi-position tandem cylinder that delivers four discrete rod stops: fully retracted (0 mm), 20 mm, 40 mm, and the total extended length of 60 mm. Each piston section generates 628 N of push force at 0.5 MPa, driven by a 16 mm diameter rod through PT1/4 ports.
This model includes a built-in magnet, allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for non-contact position feedback. The adjustable air cushion at each end, with a 21 mm cushion length, provides smooth deceleration, while the compact 235 mm body length A(SCT) simplifies machine integration.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 20 / 40 mm |
| Total travel | 60 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) | 20 mm |
| P2 (section 2) | 40 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 (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 SCT40X20X40S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×20 | 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S Is Used
Two-Stage Sorting Gate
Use the four positions (0, 20, 40, 60 mm) to divert items to three separate lanes in a conveyor system. The 20 mm and 40 mm partial extensions act as intermediate gates for precise product routing.
Multi-Depth Insertion
Control an insertion tool to three distinct depths. The 20 mm stop sets a shallow press, the 40 mm stop a mid-depth, and the full 60 mm stroke completes the final seating, all with one cylinder.
Sequential Clamping
Apply a light clamp at the 20 mm position for part alignment, a firm clamp at 40 mm for initial machining, and full 60 mm extension for the final heavy cut, all managed by sensor feedback via the built-in magnet.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S the Right Cylinder?
Choose the SCT40X20X40S when your process requires four fixed stopping points from a single compact actuator, eliminating the complexity of two separate cylinders and external hard stops. If higher force is needed, the 50 mm bore SCT provides 982 N of push per section at 0.5 MPa; for lighter, more compact tasks, the 32 mm bore offers 402 N.
As a direct replacement, match the 40 mm bore, the 20 mm and 40 mm strokes, PT port thread, basic mounting, and the -S magnet option. For a section stroke of 40 mm or less, rod bending is generally not a concern under axial loads, but always ensure the load is guided if any side force is present.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 20 + 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 SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X40S FAQ
It provides four distinct mechanical stop positions: 0 mm (fully retracted), 20 mm, 40 mm, and 60 mm (total of both strokes). The positions are achieved by pressurizing the first section, the second section, or both simultaneously.
No, an SCT cylinder does not lock or hold position when air is exhausted. The piston will drift if pressure is lost. If a load must be mechanically held at a stop like 20 mm or 40 mm without live pressure, you must add an external rod lock or a pilot-operated check valve to the circuit.
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