Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 43mm and 20mm give 4 controllable stop positions across a 63mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 143 mm
- Stroke 220 mm
- Total travel63 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20
The SCT40X43X20 is a tandem multi-position cylinder that delivers four fixed rod positions: 0 mm (fully retracted), 43 mm, 20 mm, and 63 mm (total travel). By pressurising its two 40 mm bore sections independently or together, you get a compact, all-pneumatic solution for tasks needing more than two end-stops without complex servo controls. Each actuated piston section provides 628 N of push force at 0.5 MPa, rising to 1130 N at 0.9 MPa.
Built on a rugged tie-rod platform with a 16 mm diameter rod and M12x1.25 rod thread, this cylinder includes PT1/4 ports and adjustable end cushioning for smooth deceleration. The body length A(SCT) is 235 mm, making it straightforward to integrate into machine frames where space is at a premium. It operates on standard 40 µm filtered air from 0.15 to 1.0 MPa.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20 Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 43 / 20 mm |
| Total travel | 63 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) | 43 mm |
| P2 (section 2) | 20 mm |
| P3 (both extended) | 63 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 SCT40X43X20
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×43 | 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 SCT40X43X20 Is Used
Two-Way Diverter Gate
Use the four positions to route packages to three separate conveyor lanes. Retract to 0 mm for lane one, extend to 20 mm for lane two, 43 mm for lane three, or fully extend to 63 mm to block all lanes.
Multi-Depth Pressing
Achieve two different pressing depths in a single cycle. The 20 mm stroke sets a shallow pre-form depth, while the 43 mm stroke delivers the final form depth, with the 63 mm total travel acting as a full-eject position.
Staged Part Feeding
Control a workpiece stop with four discrete positions to stage parts of varying lengths. The 20 mm and 43 mm intermediate stops allow precise positioning for different machining or assembly operations on a single fixture.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X43X20 the Right Cylinder?
Choose the SCT40X43X20 when your application requires four distinct mechanical stops without the cost and programming of a servo axis. This tandem cylinder replaces setups using two separate cylinders with external hard stops, reducing alignment work and potential drift between stages. If you need higher force, stepping up to a 50 mm bore provides 982 N of push per section at 0.5 MPa. For a direct replacement, match the 40 mm bore, both strokes (43 mm and 20 mm), PT thread, and basic mounting style. If a section stroke exceeds 300 mm, consider adding external guides to manage side loads and protect the rod bearings.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 43 + 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 SCT40X43X20 FAQ
It provides four discrete mechanical stop positions: 0 mm (fully retracted), 43 mm (first section extended), 20 mm (second section extended), and 63 mm (both sections extended for total travel).
No, a standard single-rod SC cylinder cannot replicate the four discrete stops. You must replace it with an SCT tandem cylinder matching the 40 mm bore, both 43 mm and 20 mm strokes, PT port thread, and basic mounting to maintain the same multi-position functionality.
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