Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 20mm and 30mm give 4 controllable stop positions across a 50mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 120 mm
- Stroke 230 mm
- Total travel50 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S
The SCT40X20X30S is a double-acting multi-position tandem cylinder that delivers four discrete rod stops: fully retracted (0 mm), 20 mm, 30 mm, and the total extended travel of 50 mm. Each piston section, driven by a 40 mm bore and 16 mm rod, generates a push force of 628 N at 0.5 MPa, making it a compact solution for short-throw, multi-stop tasks.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for non-contact position feedback. The cylinder body length A(SCT) is 235 mm, and it features an adjustable pneumatic cushion of 21 mm at each end to manage end-of-stroke impact. It uses PT1/4 ports and an M12x1.25 rod thread.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 20 / 30 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) | 20 mm |
| P2 (section 2) | 30 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 SCT40X20X30S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×20 | Stroke 1 (section 1) in mm. |
| ×30 | 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 SCT40X20X30S Is Used
Two-Depth Component Insertion
Uses the 20 mm and 30 mm stops to press a part to two different controlled depths in a fixture, ensuring consistent assembly without over-travel.
Miniature Gate Diverter
Positions a small diverting gate at 0 mm (closed), 20 mm (lane A), and 50 mm (lane B) to sort lightweight packages on a conveyor line.
Multi-Step Clamping Fixture
Provides a retracted, intermediate, and fully extended clamp position for holding workpieces of varying thicknesses during a two-stage machining cycle.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X30S the Right Cylinder?
Select the SCT40X20X30S when your application requires four fixed stopping points from a single, compact assembly, eliminating the complexity and cost of two separate cylinders with external hard stops. If higher force is needed, consider stepping up to the 50 mm bore SCT, which provides 982 N of push per section at the same pressure. For a direct replacement, match the 40 mm bore, both 20 mm and 30 mm strokes, PT port thread, basic mounting, and the -S magnet option.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 20 + 30 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 SCT40X20X30S FAQ
It provides 4 distinct positions because the two strokes are different. The reachable rod positions are 0 mm (fully retracted), 20 mm (first section extended), 30 mm (second section extended), and 50 mm (both sections extended).
Yes, the -S suffix in the model code indicates a built-in magnet is installed. This allows you to clamp CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the cylinder's tie-rod barrel to detect piston position.
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