Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 65mm and 255mm give 4 controllable stop positions across a 320mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 165 mm
- Stroke 2255 mm
- Total travel320 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S
The SCT40X65X255S is a tandem multi-position pneumatic cylinder that delivers four discrete rod stops: 0 mm, 65 mm, 255 mm, and the full combined travel of 320 mm. Its 40 mm bore generates 628 N of push force per actuated section at 0.5 MPa, scaling to 1130 N at the maximum operating pressure of 0.9 MPa, making it suitable for light sorting or multi-depth insertion tasks.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG solid-state and reed sensors to clamp directly onto the tie-rod barrel for end-of-stroke or mid-position confirmation. The 16 mm diameter piston rod and 21 mm adjustable air cushion at each end provide smooth deceleration across the 30–800 mm/s speed range, while the PT1/4 ports and M12x1.25 rod thread keep plumbing and tooling straightforward.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 65 / 255 mm |
| Total travel | 320 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) | 65 mm |
| P2 (section 2) | 255 mm |
| P3 (both extended) | 320 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 SCT40X65X255S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×65 | Stroke 1 (section 1) in mm. |
| ×255 | 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 SCT40X65X255S Is Used
Two-Way Diverter Gate
Use the four discrete positions to route product flow to two separate lanes. Retract fully for lane A, extend to 65 mm for a neutral position, extend to 255 mm for lane B, or fully extend to 320 mm for a maintenance bypass.
Multi-Depth Insertion
Drive a tooling pin to two different insertion depths in sequence. The 65 mm stroke sets a shallow pilot depth, while the 255 mm stroke completes the full press, all from one compact tandem cylinder body.
Staged Part Ejection
Eject parts in two stages from a nest. A short 65 mm push breaks the part free from a vacuum or magnet, then the 255 mm stroke clears it fully onto an outfeed conveyor, with sensor confirmation at each step via the built-in magnet.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X65X255S the Right Cylinder?
Choose the SCT40X65X255S when your process needs four fixed linear positions without the complexity of two separate cylinders and external hard stops. The unequal strokes (65 mm and 255 mm) create distinct approach and retract depths, ideal for two-step feeding or a bypass gate. If the 628 N push force per section at 0.5 MPa is marginal, stepping up to a 50 mm bore SCT provides 982 N per section at the same pressure. For replacement, match the 40 mm bore, both strokes (65 mm and 255 mm), PT port thread, and the -S magnet option; an SCT with basic mounting drops into the same footprint.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 65 + 255 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 SCT40X65X255S FAQ
It provides four distinct rod positions: 0 mm (fully retracted), 65 mm (first section extended), 255 mm (second section extended), and 320 mm (both sections extended, total travel). The positions are fixed by the two stroke lengths and are selected by pressurising the appropriate cylinder sections.
No, the SCT is a double-acting cylinder and does not lock or hold position when air pressure is removed or a valve centres. The piston will drift under load. If you need to hold a position without live pressure, you must add an external rod brake, a pilot-operated check valve, or a mechanical lock.
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