Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 63mm and 20mm give 4 controllable stop positions across a 83mm total travel, with a Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Stroke 163 mm
- Stroke 220 mm
- Total travel83 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S
The SCT63X63X20S is a tandem multi-position pneumatic cylinder that delivers four fixed rod positions from a single compact unit. By pressurising its two 63 mm bore sections independently or together, the rod locates precisely at 0 mm (retracted), 20 mm, 63 mm, and the combined total travel of 83 mm. Each actuated piston section generates a push force of 1559 N at 0.5 MPa, rising to 2805 N at the 0.9 MPa maximum operating pressure.
This model includes a factory-integrated magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for non-contact position feedback. The 20 mm rod is supported by a 28 mm adjustable air cushion at each end section for smooth deceleration. With a body length A of 249 mm, it fits into tight machine envelopes where two separate cylinders would be too bulky.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 mm |
| Stroke 1 / Stroke 2 | 63 / 20 mm |
| Total travel | 83 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) | 63 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 83 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 SCT63X63X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm (SCT range 32–100). |
| ×63 | 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 SCT63X63X20S Is Used
Two-Station Part Diverting
Routes parts to a primary stop at 20 mm or a secondary stop at 63 mm, with full retraction and an 83 mm bypass position for reject chutes.
Multi-Depth Press Insertion
Installs components at a shallow 20 mm depth for a pre-set, then drives to a deeper 63 mm final seat, using the 83 mm position for part ejection.
Sequential Gate Control
Operates a material gate with four openings: closed (0 mm), a 20 mm dribble feed, a 63 mm main flow, and a full 83 mm clean-out position.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X63X20S the Right Cylinder?
Choose the SCT63X63X20S when your process needs four distinct mechanical stops without the complexity of servo controls or multiple actuators. It replaces setups using two separate 63 mm bore cylinders and external hard stops, simplifying plumbing and eliminating alignment drift between units. For lighter loads, stepping down to a 50 mm bore (982 N push at 0.5 MPa) reduces air consumption; for higher thrust, the 80 mm bore (2513 N push at 0.5 MPa) provides more force. The built-in magnet is essential if you require sensor-based end-of-stroke or mid-position confirmation. A direct replacement must match the 63 mm bore, both 63 mm and 20 mm strokes, PT port thread, and the -S magnet option.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 63 + 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 SCT63X63X20S FAQ
This cylinder has four discrete rod positions: 0 mm (fully retracted), 20 mm (section two extended), 63 mm (section one extended), and 83 mm (both sections extended). The positions are fixed by the two stroke lengths and are selected by pressurising the corresponding air ports.
No, like all standard pneumatic cylinders, the SCT series does not mechanically lock. If air pressure is exhausted or a directional valve centers, the piston rod can drift or drop under load. To securely hold a load at any intermediate position without live pressure, you must add an external rod brake, a pilot-operated check valve, or a mechanical locking unit.
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