Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S
The AirTAC Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 75mm and 125mm give 4 controllable stop positions across a 200mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Stroke 175 mm
- Stroke 2125 mm
- Total travel200 mm
- Positions4 stops
- Port sizePT1/4
About the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S
The SCT40X75X125S is a double-acting, multi-position tandem cylinder that delivers four fixed rod positions from two integrated strokes on a single piston rod. By pressurising the 75 mm front section, the 125 mm rear section, or both simultaneously, you obtain precise mechanical stops at 0 mm, 75 mm, 125 mm, and the full 200 mm total travel. This discrete-position design eliminates the complexity of servo systems for repeatable, mid-stroke locating tasks.
Each 40 mm bore section generates 628 N of push force and 528 N of pull force at 0.5 MPa, with a maximum push of 1130 N at 0.9 MPa. The unit features a 16 mm diameter chrome-plated rod, PT1/4 ports, and a 21 mm adjustable air cushion at each end for smooth deceleration. A built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for non-contact position sensing.
Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S Technical Specifications
| Model | Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 75 / 125 mm |
| Total travel | 200 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) | 75 mm |
| P2 (section 2) | 125 mm |
| P3 (both extended) | 200 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 SCT40X75X125S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×75 | Stroke 1 (section 1) in mm. |
| ×125 | 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 SCT40X75X125S Is Used
3-Way Diverter Gates
Use the four discrete stops (0, 75, 125, 200 mm) to align a chute or gate with three separate conveyor lines, plus a closed home position, for reliable material sorting.
Multi-Depth Pressing
Achieve two distinct pressing depths (75 mm and 200 mm) and a partial retract position (125 mm) for forming or assembly operations that require different tool clearances in one cycle.
Staged Part Feeding
Control an escapement mechanism to advance parts in three increments. The magnet-equipped barrel provides sensor confirmation at each of the four positions for error-proofed sequencing.
Is the Airtac SCT32-63 Multi-Position Tandem Air Cylinder SCT40X75X125S the Right Cylinder?
This 4-position SCT model replaces complex setups that would otherwise require two separate cylinders with external hard stops or a linear slide with multiple sensors. It is an ideal fit for applications needing three distinct intermediate positions, such as a diverter gate with a home, two pass-through heights, and a full-open state. The 200 mm total stroke is achieved without increasing the machine's overall length compared to a single 200 mm stroke cylinder.
For higher thrust requirements, consider stepping up to the SCT50 bore, which provides 982 N of push force per section at 0.5 MPa. A direct replacement must match the 40 mm bore, the 75 mm and 125 mm section strokes, PT port threads, and the integrated magnet for sensor compatibility. Note that with a total travel of 200 mm and a rod diameter of 16 mm, ensure the external load is guided if side forces are present to prevent rod bending.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 75 + 125 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 SCT40X75X125S FAQ
This tandem cylinder provides four discrete mechanical stop positions: 0 mm (fully retracted), 75 mm (front section extended), 125 mm (rear section extended), and 200 mm (both sections extended for total travel). Because the two strokes are unequal, you get four unique stopping points.
Yes, it is a direct replacement for systems using two separate 40 mm bore cylinders with 75 mm and 125 mm strokes to achieve three mid-stroke positions. The SCT40X75X125S integrates both strokes on a single common rod, reducing mounting space and alignment complexity. Ensure the replacement matches the PT port thread and the -S magnet option if sensors are used.
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