Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 125mm and 125mm give 3 controllable stop positions across a 250mm total travel, with a Ø100mm bore, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Stroke 1125 mm
- Stroke 2125 mm
- Total travel250 mm
- Positions3 stops
- Port sizePT1/2
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S
The SCT100X125X125S is a double-acting multi-position tandem cylinder that provides three fixed rod positions: fully retracted (0 mm), 125 mm, and 250 mm total travel. Each 100 mm bore piston section generates 3927 N of push force at 0.5 MPa, scaling up to 7068 N at the maximum operating pressure of 0.9 MPa, driven through a rigid 25 mm diameter rod.
A built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable, non-contact position sensing at each stop. The cylinder body length A(SCT) is 308 mm, and it uses a 29 mm adjustable air cushion to decelerate the piston smoothly at both ends of the 250 mm combined stroke, protecting end caps from impact.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø100 mm |
| Stroke 1 / Stroke 2 | 125 / 125 mm |
| Total travel | 250 mm |
| Stop positions | 3 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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, 29 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 (3)
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 125 mm |
| P2 (both extended) | 250 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm (SCT range 32–100). |
| ×125 | 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S Is Used
3-Way Diverter Gate
Positions a chute or gate at a closed, mid-flow, and full-open position on a conveyor line, using the three discrete stops (0, 125, 250 mm) for positive mechanical alignment without over-travel.
Two-Depth Press Platen
Drives a platen to a safe retracted position, a partial-engagement depth at 125 mm, and a full-press depth at 250 mm, using the cylinder's fixed mechanical stops for repeatable depth control.
Multi-Stop Clamping Fixture
Operates a clamp with a fully open, a part-present sensing position, and a fully clamped position, with CMSG sensors on the barrel confirming arrival at each discrete stop before the next cycle.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S the Right Cylinder?
Choose this 3-position SCT when your application needs a single actuator to reliably stop at a home, mid, and extended position, eliminating the complexity and air consumption of two separate cylinders with external stops. The 125 mm section strokes keep the assembly compact while providing a clear 250 mm total reach. If your force requirement is lower, consider stepping down to an 80 mm bore, which provides 2513 N of push per section at 0.5 MPa.
For a drop-in replacement, match the 100 mm bore, both 125 mm section strokes, PT port thread, and the integrated magnet (-S). This basic mount configuration requires you to support the cylinder body; if panel mounting is needed, select an FA or FB flange variant. With a section stroke over 100 mm, ensure the guided load is aligned to prevent side-loading and rod bending.
Multi-position checklist
- ✓ Need 3 repeatable stops?
- ✓ Section strokes 125 + 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 SCT80~100 Multi-Position Tandem Cylinder SCT100X125X125S FAQ
It provides 3 distinct mechanical stop positions because both section strokes are equal at 125 mm. The rod positions are 0 mm (fully retracted), 125 mm (first section extended), and 250 mm (both sections extended for total travel).
Yes, if the original unit is an AirTAC SCT with a 100 mm bore, both strokes at 125 mm, PT ports, and a built-in magnet. Confirm the mounting style matches your current setup; this basic mount version has no brackets, so you will reuse your existing FA, FB, CA, CB, or LB mounting accessories.
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