Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S
The AirTAC Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 50mm and 125mm give 4 controllable stop positions across a 175mm total travel, with a Ø80mm bore, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Stroke 150 mm
- Stroke 2125 mm
- Total travel175 mm
- Positions4 stops
- Port sizePT3/8
About the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S
The SCT80X50X125S is an 80 mm bore multi-position tandem cylinder that provides four distinct mechanical stops along its stroke: 0 mm (fully retracted), 50 mm, 125 mm, and the combined total travel of 175 mm. Each piston section generates a push force of 2513 N at 0.5 MPa, scaling up to 4523 N at the maximum operating pressure of 0.9 MPa, giving you robust pneumatic actuation without complex servo controls.
A built-in magnet ring is fitted as standard on this -S variant, allowing direct mounting of CMSG, DMSG, or EMSG solid-state sensors along the tie-rod barrel for reliable end-of-position or intermediate-stop sensing. The cylinder body has an A(SCT) length of 296 mm, uses a 25 mm diameter piston rod with an M20x1.5 thread, and features PT3/8 ports with an adjustable air cushion of 28 mm for smooth deceleration at each stroke end.
Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S Technical Specifications
| Model | Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø80 mm |
| Stroke 1 / Stroke 2 | 50 / 125 mm |
| Total travel | 175 mm |
| Stop positions | 4 positions |
| Acting type | Double acting (tandem, multi-position) |
| Port size | PT3/8 |
| 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, 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) | 50 mm |
| P2 (section 2) | 125 mm |
| P3 (both extended) | 175 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SCT80X50X125S
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm (SCT range 32–100). |
| ×50 | 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 SCT80X50X125S Is Used
Two-Stage Sorting Gate
Actuate a diverter to three positions—retracted for lane one, 50 mm for lane two, and 125 mm for lane three—using simple pneumatic valves, eliminating the need for multiple actuators at a conveyor junction.
Multi-Depth Pressing
Control a press platen to two distinct working depths. The 50 mm stroke sets a shallow pre-form, while the full 175 mm travel completes the final pressing operation, all from one compact tandem unit.
Sequential Clamping Fixture
Use the four discrete positions to first locate a workpiece at 50 mm extension, then apply full clamping force at 125 mm. The integrated magnet confirms each position via sensors before the next machining cycle starts.
Is the Airtac SCT80~100 Multi-Position Tandem Cylinder SCT80X50X125S the Right Cylinder?
Choose the SCT when your application needs fixed, repeatable intermediate stops without the cost and programming of electric actuators. This four-position model is ideal where a single cylinder must locate a tool or part at two distinct extended positions. If lower force is sufficient, stepping down to the 63 mm bore reduces the per-section push to 1559 N at 0.5 MPa; for higher thrust, the 100 mm bore delivers 3927 N at the same pressure.
For direct replacement, match an AirTAC SCT with an 80 mm bore, 50 mm and 125 mm section strokes, PT port thread, and the -S magnet option. Since the combined stroke reaches 175 mm, ensure the rod is adequately guided if significant side loads are present to prevent bending or uneven seal wear.
Multi-position checklist
- ✓ Need 4 repeatable stops?
- ✓ Section strokes 50 + 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 SCT80X50X125S FAQ
This model provides four distinct mechanical stop positions: 0 mm (fully retracted), 50 mm, 125 mm, and 175 mm (the sum of both strokes). You select the position by pressurizing the first section, the second section, or both simultaneously.
Yes, the -S suffix designates a built-in magnetic piston ring. This allows you to mount CMSG reed switches or DMSG/EMSG solid-state sensors directly onto the cylinder's tie-rods to detect any of the four discrete positions for sequence control.
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