Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 30mm and 20mm give 4 controllable stop positions across a 50mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 130 mm
- Stroke 220 mm
- Total travel50 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S
The SCT40X30X20S is a double-acting tandem cylinder that delivers four fixed rod positions from two pneumatic sections on a single axis. With a 30 mm stroke on the first section and 20 mm on the second, the rod can be reliably stopped at 0 mm (fully retracted), 30 mm, 20 mm, and the total travel of 50 mm by pressurising the sections individually or together.
This model includes a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The 40 mm bore generates 628 N of push force per actuated section at 0.5 MPa, transmitted through a 16 mm diameter piston rod. The body has a 21 mm air cushion at each end for smooth deceleration and an overall length of 235 mm.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 30 / 20 mm |
| Total travel | 50 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) | 30 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 50 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 SCT40X30X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×30 | 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 SCT40X30X20S Is Used
Multi-Level Sorting Gate
Directs parts to two different chute heights by stopping the actuator at 20 mm for the lower lane and 50 mm for the upper lane, using the 30 mm intermediate stop for a reject bin.
Two-Depth Pressing Station
Performs a light pre-press at the 20 mm position and a full-depth press at 50 mm total travel, with sensor confirmation at each discrete stop via the built-in magnet.
Dual-Stop Part Feeding
Advances a pusher plate to 30 mm for small components and to the full 50 mm stroke for larger parts on the same conveyor line, simplifying the control architecture.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X30X20S the Right Cylinder?
Selecting an SCT tandem cylinder eliminates the complexity and misalignment risks of linking two separate standard cylinders to achieve multi-stop positioning. This 40 mm bore unit with 30 mm and 20 mm strokes is ideal when you need four distinct mechanical stops in a compact, single-body assembly. If your application requires more force, stepping up to the 50 mm bore provides 982 N of push per section at the same 0.5 MPa pressure.
For a direct replacement, match the 40 mm bore, the exact 30 mm and 20 mm section strokes, PT port thread, and the built-in magnet (-S suffix). The basic mounting configuration means no additional brackets are supplied, allowing you to use your existing mounting hardware or choose from the FA, FB, CA, CB, or LB accessory kits.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 30 + 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 SCT40X30X20S FAQ
It provides four discrete mechanical stops. The rod positions are 0 mm (fully retracted), 30 mm (first section extended), 20 mm (second section extended), and 50 mm (both sections extended for total travel).
While two separate cylinders could be configured to provide similar stops, the SCT40X30X20S integrates both strokes into a single, aligned tie-rod body, eliminating the need for complex external bracketing and ensuring coaxial force transmission. A direct replacement requires matching the 40 mm bore, both the 30 mm and 20 mm strokes, and the -S magnet option.
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