Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 70mm and 20mm give 4 controllable stop positions across a 90mm total travel, with a Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Stroke 170 mm
- Stroke 220 mm
- Total travel90 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S
The SCT63X70X20S creates four fixed rod positions—0 mm, 20 mm, 70 mm, and the full 90 mm extension—by combining two piston sections on a single axis. Each section delivers 1559 N of push force at 0.5 MPa (2805 N at 0.9 MPa), driven by a 20 mm rod with PT1/4 ports and a 28 mm air cushion for smooth deceleration.
A built-in magnet allows CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for contactless position feedback at every stop. The cylinder body length A(SCT) is 249 mm, making it a compact alternative to two separate actuators with external hard stops when you need a sequenced three-step or four-step motion.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 mm |
| Stroke 1 / Stroke 2 | 70 / 20 mm |
| Total travel | 90 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) | 70 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 90 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 SCT63X70X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm (SCT range 32–100). |
| ×70 | 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 SCT63X70X20S Is Used
Two-Way Diverter Gate
Use the four positions (0, 20, 70, 90 mm) to route product flow to three separate lanes—retracted for lane A, 20 mm for lane B, 70 mm for lane C, and full extension as a safe park position.
Multi-Depth Press Insertion
Insert bushings or pins to two controlled depths in one cycle. The 20 mm stroke sets a shallow pre-press, the 70 mm stroke drives to full seat, and the 90 mm total travel provides part ejection clearance.
Staged Clamping & Forming
Apply a light 20 mm clamp stroke to position a workpiece, then engage the 70 mm stroke for full forming pressure. Sensor feedback at each stop confirms part presence before the next stage.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X70X20S the Right Cylinder?
Choose this four-position tandem when a process requires two distinct mid-stroke stops plus full retract and extend—common in diverting gates or two-depth pressing. If you need higher force, step up to the 80 mm bore (2513 N push at 0.5 MPa); for a lighter, faster cycle, the 50 mm bore provides 982 N. The built-in magnet (-S suffix) is already included, so you can mount sensors without additional brackets.
For drop-in replacement, match the 63 mm bore, both strokes (70 mm and 20 mm), PT port thread, and the magnet option. SCT mounting is basic on this model; if you later need a pivoting mount, add a CA rear clevis or CB double clevis. With the 70 mm section stroke under 300 mm, rod side-loading is minimal under normal alignment.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 70 + 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 SCT63X70X20S FAQ
It provides four discrete mechanical stops: 0 mm (fully retracted), 20 mm (stroke 2 only), 70 mm (stroke 1 only), and 90 mm (both sections extended). The stops are fixed by the two section strokes and are not infinitely adjustable.
No. Like all standard pneumatic cylinders, the SCT63X70X20S will drift or drop if air pressure is lost or the valve centers. To hold a load at any mid-position without live pressure, you must add an external rod brake, a pilot-operated check valve, or a mechanical lock.
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