Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 120mm and 20mm give 4 controllable stop positions across a 140mm total travel, with a Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Stroke 1120 mm
- Stroke 220 mm
- Total travel140 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20
The SCT63X120X20 is a tandem multi-position cylinder that delivers four fixed rod positions: 0 mm (fully retracted), 20 mm, 120 mm, and the total travel of 140 mm. By pressurising either piston section individually or both together, you get repeatable mechanical stops without external hardware. Each 63 mm bore section generates 1559 N of push force at 0.5 MPa, rising to 2805 N at 0.9 MPa, making it suitable for medium-force diverting and sorting tasks.
This model uses a 20 mm diameter piston rod with M16x1.5 male threads and PT1/4 ports. The adjustable air cushion at each end has a 28 mm cushion length, and the body length A(SCT) is 249 mm. Operating on filtered air from 0.15 to 1.0 MPa, it handles temperatures from -20 to +70 °C with its standard TPU seals. The tie-rod construction keeps it serviceable and robust for industrial automation.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 mm |
| Stroke 1 / Stroke 2 | 120 / 20 mm |
| Total travel | 140 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) | 120 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 140 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 SCT63X120X20
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm (SCT range 32–100). |
| ×120 | 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 SCT63X120X20 Is Used
Two-Way Part Diverting
Use the 20 mm stroke to nudge parts onto a bypass lane and the 120 mm stroke to push them fully onto a main conveyor, giving a compact diverter with just one cylinder.
Multi-Depth Pressing
Achieve a light 20 mm pre-press depth for alignment, then drive to the full 140 mm position for final insertion, all with repeatable mechanical stops.
Staged Component Feed
Advance a workpiece 20 mm into a fixture for a first operation, then extend to 120 mm to present it to a second tool, eliminating a second actuator.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X120X20 the Right Cylinder?
Choose the SCT63X120X20 when your process needs two distinct extended positions plus a retracted home—for instance, a 20 mm pre-pick offset and a 120 mm full-extend placement. This tandem unit is more compact and cost-effective than mounting two separate 63 mm bore cylinders back-to-back with external stops. If your force requirement is lower, stepping down to a 50 mm bore provides 982 N push per section at 0.5 MPa; for heavier loads, the 80 mm bore delivers 2513 N per section.
When replacing an existing SCT63X120X20, match the bore, both strokes (120 mm and 20 mm), the PT port thread, and the basic mounting configuration. For strokes over 300 mm, consider external guides to protect the 20 mm rod from side-load deflection, though this model's shorter combined travel keeps bending moments low.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 120 + 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 SCT63X120X20 FAQ
It provides four discrete mechanical stops: 0 mm (fully retracted), 20 mm (section 2 extended), 120 mm (section 1 extended), and 140 mm (both sections extended). The positions are fixed by the two stroke lengths and are selected by pressurising the appropriate cylinder ports.
Yes, if your sequence requires a 20 mm and a 120 mm stroke from the same rod line. The SCT tandem design eliminates the need to couple two separate cylinders and align their strokes. Ensure the replacement matches the 63 mm bore, both strokes, PT1/4 ports, and basic mounting.
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