Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X20X40
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X20X40 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 Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 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 SCT63X20X40
The SCT63X20X40 tandem cylinder delivers four fixed rod positions—0 mm, 20 mm, 40 mm, and the combined 60 mm total travel—from a single tie-rod body. Each 63 mm bore section generates 1559 N of push force at 0.5 MPa, giving predictable thrust for short-stroke indexing tasks without the complexity of two separate actuators.
Built with a 20 mm diameter piston rod and M16x1.5 rod-end threads, the unit uses PT1/4 ports and includes a 28 mm adjustable air cushion on each section for controlled end-of-stroke deceleration. The body length A measures 249 mm, making it a compact solution for machines that need three or four distinct mechanical stops in a confined space.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X20X40 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X20X40 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 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 | M16×1.5 |
| 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, 28 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SCT63X20X40
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | 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 SCT63X20X40 Is Used
Two-Stage Part Diverting
Actuate a diverter gate to three distinct angles—home, partial divert, and full divert—using the 0, 20, and 60 mm positions to sort small packages onto separate conveyor lanes.
Multi-Depth Insertion
Drive a tooling pin to two different insertion depths (20 mm and 40 mm) in an assembly fixture, then retract fully, all from one compact cylinder controlled by two solenoid valves.
Sequential Clamping
Apply a light pre-clamp at the 20 mm stroke, then full clamping force at the 60 mm total travel position, giving operators a two-step pressure sequence from a single actuator.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X20X40 the Right Cylinder?
Choose the SCT when your process requires two or more fixed stop positions that must be selected purely by valving—no external hard stops or dual-cylinder linkages needed. This 63 mm bore model suits medium-force applications; if you need lower thrust, stepping down to the 50 mm bore (982 N push at 0.5 MPa per section) reduces air consumption and physical size. For a direct replacement, match the 63 mm bore, both strokes (20 mm and 40 mm), PT port thread, and basic mounting configuration. If the application involves a guided load, consider pairing the cylinder with an external linear guide, as the tandem rod layout does not internally resist side loads.
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 SCT63X20X40 FAQ
It provides four discrete mechanical stops: fully retracted (0 mm), first section extended (20 mm), second section extended (40 mm), and both sections extended for the total travel of 60 mm. The stops are fixed by the two stroke lengths and are selected by pressurising the appropriate cylinder sections.
Yes, if your motion sequence requires only the discrete 20 mm and 40 mm strokes. The SCT combines both strokes into one tie-rod body, eliminating the need to align two cylinders and reducing the overall footprint. Ensure the replacement matches the 63 mm bore, PT1/4 ports, and basic mounting to be a drop-in fit.
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