Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 40mm and 20mm give 4 controllable stop positions across a 60mm total travel, with a Ø50mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Stroke 140 mm
- Stroke 220 mm
- Total travel60 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20
The AirTAC SCT50X40X20 is a double-acting, multi-position tandem cylinder that delivers four distinct mechanical stops from two piston sections on a common rod. With stroke1 set at 40 mm and stroke2 at 20 mm, the achievable rod positions are 0 mm (fully retracted), 40 mm, 20 mm, and the total travel of 60 mm. This configuration is ideal for applications requiring two different extension depths without the complexity of servo controls.
Built on a durable tie-rod construction with a 50 mm bore, each actuated section provides a push force of 982 N at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa. The unit features a 20 mm diameter piston rod, M16x1.5 rod thread, and PT1/4 ports. Its adjustable pneumatic cushioning (21 mm cushion length) ensures smooth deceleration at each stop, while the standard TPU seals support an operating temperature range of -20 to +70 °C.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø50 mm |
| Stroke 1 / Stroke 2 | 40 / 20 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, 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) | 40 mm |
| P2 (section 2) | 20 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 (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 SCT50X40X20
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm (SCT range 32–100). |
| ×40 | 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 SCT50X40X20 Is Used
Two-Depth Part Insertion
Uses the 20 mm and 40 mm stops to insert components to two different precise depths in an assembly fixture, ensuring consistent press-fit quality.
Dual-Position Sorting Gate
Directs parts on a conveyor to one of two lanes by extending to 20 mm for the first lane or 40 mm for the second, with the 60 mm total travel used for a reject chute.
Staged Clamping Operation
Provides a light initial clamp at the 20 mm position for part alignment, followed by a full-force clamp at the 40 mm position for machining, all from a single compact actuator.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT50X40X20 the Right Cylinder?
Select the SCT50X40X20 when your process needs two fixed, repeatable stop positions that are not equal to the full stroke. This tandem cylinder replaces the need for two separate standard cylinders with external mechanical stops, reducing mounting hardware and simplifying pneumatic plumbing. If your application requires higher thrust, consider stepping up to the 63 mm bore SCT, which provides 1559 N of push force per section at 0.5 MPa.
For a direct replacement, match the 50 mm bore, the exact 40 mm and 20 mm strokes, and the PT port thread. This model is a basic unit without a magnetic piston or mounting brackets; if you need sensor feedback, order the -S variant. Note that the 20 mm stroke section is relatively short, so ensure your flow controls are properly tuned to avoid hard metal-to-metal contact at the end of travel.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 40 + 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 SCT50X40X20 FAQ
This tandem cylinder provides four discrete mechanical stops. By pressurizing the sections individually or together, the piston rod can be reliably positioned at 0 mm (retracted), 40 mm (section 1 extended), 20 mm (section 2 extended), and 60 mm (both sections extended for full travel).
Yes, it is designed to do exactly that. The SCT50X40X20 integrates two strokes into one compact body, eliminating the need to mount and align two individual cylinders with external hard stops. Ensure the replacement matches the 50 mm bore, both the 40 mm and 20 mm strokes, and the PT port thread.
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