Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 40mm and 85mm give 4 controllable stop positions across a 125mm total travel, with a Ø63mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Stroke 140 mm
- Stroke 285 mm
- Total travel125 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85
The SCT63X40X85 tandem cylinder provides four fixed rod positions—0 mm, 40 mm, 85 mm, and 125 mm total travel—by pressurising two independent 63 mm bore sections on a common rod line. Each actuated section generates 1559 N of push force at 0.5 MPa, rising to 2805 N at the maximum 0.9 MPa operating pressure, making it suitable for multi-stop diverting or two-depth pressing tasks.
Built on a tie-rod body with a 249 mm base length A(SCT), this model uses a 20 mm diameter rod with M16x1.5 threads and PT1/4 ports. The 28 mm adjustable air cushion at each end section decelerates the piston smoothly, while the standard TPU seals support an operating temperature range of -20 to +70 °C.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø63 mm |
| Stroke 1 / Stroke 2 | 40 / 85 mm |
| Total travel | 125 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, 28 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) | 85 mm |
| P3 (both extended) | 125 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SCT63X40X85
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm (SCT range 32–100). |
| ×40 | Stroke 1 (section 1) in mm. |
| ×85 | 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 SCT63X40X85 Is Used
Two-Way Diverting Gate
Use the 40 mm and 85 mm stops to direct product flow into two separate chutes from a single conveyor lane, with the 125 mm full-extension position clearing the gate for maintenance.
Dual-Depth Press Insertion
Drive a tool to a shallow 40 mm pre-set depth for one component variant, then extend to the full 125 mm depth for a longer insert, all with repeatable pneumatic positioning.
Multi-Stop Clamping Fixture
Clamp thin workpieces at the 85 mm rod position and thicker assemblies at 40 mm, using the 0 mm retracted state for fast part loading and unloading.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT63X40X85 the Right Cylinder?
Choose the SCT63X40X85 when your application needs four distinct mechanical stops without the complexity of two separate cylinders and external hard stops. The 40 mm and 85 mm strokes give you asymmetric positioning that a single-rod cylinder cannot provide. If your force requirement is lower, stepping down to the 50 mm bore reduces per-section push to 982 N at 0.5 MPa; for higher thrust, the 80 mm bore offers 2513 N per section.
A direct replacement must match the 63 mm bore, both the 40 mm and 85 mm section strokes, PT1/4 port thread, and basic mounting. If you are adding external guides, note that the 125 mm total extended length can introduce a side-load moment on the 20 mm rod; a guide rail or rod-alignment coupler is recommended for offset loads.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 40 + 85 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 SCT63X40X85 FAQ
It provides four discrete mechanical stops: 0 mm (fully retracted), 40 mm (section one extended), 85 mm (section two extended), and 125 mm (both sections extended). The stops are fixed by the two stroke lengths and are not infinitely adjustable.
Yes, provided the original unit is an AirTAC SCT tandem cylinder with a 63 mm bore, 40 mm and 85 mm section strokes, PT1/4 ports, and basic (no bracket) mounting. Confirm the magnet option matches your sensor setup; this basic model has no built-in magnet.
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