Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 20mm and 75mm give 4 controllable stop positions across a 95mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 120 mm
- Stroke 275 mm
- Total travel95 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75
The SCT40X20X75 tandem cylinder delivers four fixed rod positions—0, 20, 75, and 95 mm—by combining two piston sections on a single 16 mm diameter rod. Each section independently generates about 628 N of push force at 0.5 MPa, making it ideal for diverting parts or selecting between two feed depths without needing two separate actuators.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for end-of-stroke or mid-position confirmation. The 40 mm bore body has a length of 235 mm (A dimension) and uses PT1/4 ports with an adjustable air cushion of 21 mm for smooth deceleration.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 20 / 75 mm |
| Total travel | 95 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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) | 20 mm |
| P2 (section 2) | 75 mm |
| P3 (both extended) | 95 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCT40X20X75
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×20 | Stroke 1 (section 1) in mm. |
| ×75 | 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 SCT40X20X75 Is Used
Two-Way Part Diverting
Use the 20 mm and 95 mm extended positions to divert light packages onto two separate conveyor lanes from a single infeed point.
Dual-Depth Pressing
Actuate the 20 mm section for a shallow pre-press, then engage the 75 mm section for the full 95 mm stroke, ideal for two-stage insertion or forming tasks.
Multi-Stop Gate Control
Control a material gate with four distinct openings (closed, 20 mm, 75 mm, 95 mm) to regulate the flow of granular materials by size or volume.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X75 the Right Cylinder?
Choose the SCT when your application needs up to four discrete mechanical stops from a single compact cylinder, avoiding the complexity and cost of two independent cylinders with external hard stops. If you require higher force, consider stepping up to the 50 mm bore SCT, which provides 982 N of push per section at 0.5 MPa.
For a direct replacement, match the 40 mm bore, both strokes (20 mm and 75 mm), the PT port thread, and the built-in magnet. This basic mount model can be upgraded with FA or FB flanges for end-face mounting, or CA/CB clevises for pivoting motion. Note that the SCT is a tie-rod cylinder and does not interchange with ISO 15552 profiles.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 20 + 75 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 SCT40X20X75 FAQ
It provides 4 discrete positions: fully retracted (0 mm), first section extended (20 mm), second section extended (75 mm), and both sections extended for the total travel of 95 mm. These stops are fixed by the cylinder's mechanical stroke and are not infinitely adjustable.
No, like all standard pneumatic cylinders, the SCT40X20X75 will drift or drop if pressure is lost or the directional valve is centered. To hold a load at any position without live pressure, you must add an external rod lock, a mechanical brake, or a pilot-operated check valve.
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