Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 20mm and 70mm give 4 controllable stop positions across a 90mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 120 mm
- Stroke 270 mm
- Total travel90 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70
The SCT40X20X70 is a double-acting tandem cylinder that delivers four fixed rod positions by pressurising its two piston sections independently. With a 40 mm bore, 16 mm rod, and PT1/4 ports, the achievable stops are 0 mm (fully retracted), 20 mm, 70 mm, and the combined total travel of 90 mm. Each section generates 628 N of push force at 0.5 MPa, scaling to 1130 N at the maximum operating pressure of 0.9 MPa.
This model uses a tie-rod construction with a 21 mm adjustable air cushion in each section for reliable end-of-stroke deceleration. The body length A(SCT) is 235 mm, providing a compact tandem package for light automation tasks. Standard TPU seals and PT threads suit general industrial environments from -20 to +70 °C.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 20 / 70 mm |
| Total travel | 90 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) | 70 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 (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 SCT40X20X70
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×20 | Stroke 1 (section 1) in mm. |
| ×70 | 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 SCT40X20X70 Is Used
Two-Stage Sorting Gate
Uses the 20 mm stop for a partial gate opening to separate small parts, and the full 90 mm extension to divert larger items onto a different conveyor lane.
Dual-Depth Press Feed
Advances a workpiece to a 20 mm pre-register position for a light stamp, then extends to the full 90 mm for the final forming operation in a progressive die.
Multi-Stop Clamping Fixture
Provides a 70 mm clamp position for tall components and a 20 mm position for thin assemblies, eliminating manual jaw adjustment between batch runs.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X20X70 the Right Cylinder?
Choose the SCT40X20X70 when your sequence needs four distinct mechanical stops without the complexity of servo control or two separate cylinders with external hard stops. The 20 mm and 70 mm strokes give a short advance for a preliminary action and a longer second stroke for the main feed, all on one common rod line. If your per-section force requirement is lower, the SCT32 series offers 402 N push at 0.5 MPa; for heavier tooling, stepping up to the SCT50 bore provides 982 N per section.
For drop-in replacement, match the 40 mm bore, both stroke lengths (20 mm and 70 mm), PT port thread, and basic mounting. If your existing unit has a magnet for sensors, ensure the replacement code includes the -S suffix. Always verify the total envelope length A(SCT) of 235 mm fits the mounting space.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 20 + 70 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 SCT40X20X70 FAQ
This tandem cylinder provides four discrete mechanical stops: 0 mm (fully retracted), 20 mm (section 1 extended), 70 mm (section 2 extended), and the total combined travel of 90 mm (both sections extended). The positions are fixed by the two stroke lengths and are not infinitely adjustable.
Yes, in many cases the SCT40X20X70 can replace a setup with two individual cylinders and external stop collars, saving space and simplifying the pneumatic circuit. The replacement must match the 40 mm bore, the 20 mm and 70 mm stroke combination, and the PT port thread to ensure identical mounting and performance.
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