Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X70X20S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X70X20S 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 Ø50mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ50 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 SCT50X70X20S
The SCT50X70X20S is a 50 mm bore multi-position tandem cylinder that delivers four distinct rod positions from two independent piston sections. With strokes of 70 mm and 20 mm, the reachable stops are 0 mm (fully retracted), 20 mm, 70 mm, and the total travel of 90 mm. Each actuated section provides a push force of 982 N at 0.5 MPa, rising to 1767 N at 0.9 MPa, driven through a 20 mm diameter piston rod.
This model includes a built-in magnet, allowing direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for non-contact position feedback. The cylinder body length is 243 mm, and it uses adjustable pneumatic cushioning with a 21 mm cushion length to decelerate the load smoothly at each end of the total stroke. It is a genuine AirTAC component, designed for reliable discrete positioning without complex servo controls.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X70X20S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X70X20S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø50 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, 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) | 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SCT50X70X20S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 50 | 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 SCT50X70X20S Is Used
Two-Stage Sorting Gate
Uses the 20 mm stroke for a primary divert and the 70 mm stroke for a secondary reject lane, creating four gate positions from one compact cylinder.
Multi-Depth Pressing
Provides two distinct pressing depths (20 mm and 70 mm) plus a full 90 mm retract for part loading, ideal for light assembly or staking operations.
Multi-Stop Part Feeding
Acts as a programmable hard stop for a conveyor lane, stopping parts at 20 mm, 70 mm, or 90 mm positions to queue them for different downstream processes.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X70X20S the Right Cylinder?
Choose the SCT50X70X20S when your application requires four fixed mechanical stops without the cost and complexity of two separate cylinders and external hard stops. This tandem unit is more compact and ensures the position relationship between the two strokes is permanently fixed. If you need higher force, stepping up to the 63 mm bore provides 1559 N of push per section at 0.5 MPa, though the body length increases to 249 mm.
For a drop-in replacement, you must match the 50 mm bore, the exact 70 mm and 20 mm strokes, the PT port thread, and the built-in magnet. The mounting is basic, so the replacement must also be a basic SCT unit or one where the mounting accessory can be removed to match the existing footprint. Note that the 70 mm stroke section can create a moderate side-load moment when fully extended; ensure the external load is guided if it is not purely axial.
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 SCT50X70X20S FAQ
This cylinder provides four distinct mechanical stops. The rod can be positioned at 0 mm (fully retracted), 20 mm (second section extended), 70 mm (first section extended), and 90 mm (both sections extended). The stops are fixed by the two stroke lengths and are selected by pressurizing the appropriate cylinder sections.
While an SC cylinder with external hard stops can achieve multiple positions, the SCT50X70X20S integrates both strokes into a single tandem body, which is more compact and guarantees the 20 mm and 70 mm position relationship is permanently fixed. A direct replacement must be an AirTAC SCT with a 50 mm bore, 70 mm and 20 mm strokes, PT ports, and a built-in magnet.
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Standard models usually ship in 3-4 days.
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