The AirTAC Airtac SCT Multi-Position Cylinders SCT40X50X100 is a genuine double-acting MULTI-POSITION (tandem) air cylinder: two piston sections of 50mm and 100mm give 4 controllable stop positions across a 150mm total travel, with a Ø40mm bore, PT1/4 ports and adjustable end cushioning.
The SCT40X50X100 pairs a 50 mm front section with a 100 mm rear section on a 40 mm bore tandem body, so one valve pair reaches four discrete rod stops: 0 mm, 50 mm, 100 mm and the full 150 mm travel. Each actuated section delivers about 628 N push and 528 N pull at 0.5 MPa, rising to 879 N push at 0.7 MPa. It is a double-acting cylinder with adjustable end cushions (21 mm on this bore) and PT1/8-sized PT1/4 ports.
The 40 mm barrel carries a 16 mm rod and has an overall body length of 235 mm, compact enough for tight machine frames. With a 30-800 mm/s speed window and 0.15-1.0 MPa operating range, this unit suits two-depth feeding, gate selection and multi-stop indexing. Note that the rod will drift if air is exhausted at a stop; add a pilot-operated check valve or mechanical lock where a load must stay put without live pressure.
| Model | Airtac SCT Multi-Position Cylinders SCT40X50X100 |
|---|---|
| Series | SCT multi-position tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke 1 / Stroke 2 | 50 / 100 mm |
| Total travel | 150 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.
| Position | Rod extension |
|---|---|
| P0 (retracted) | 0 mm |
| P1 (section 1) | 50 mm |
| P2 (section 2) | 100 mm |
| P3 (both extended) | 150 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.
| 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.
| SCT | Multi-position (tandem) tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm (SCT range 32–100). |
| ×50 | Stroke 1 (section 1) in mm. |
| ×100 | 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.
Stop at 50 mm to push into lane one, 100 mm for lane two, or the full 150 mm for lane three - one cylinder replaces a bank of single-stroke units on a sorting conveyor.
Use the 50 mm stop for a light pre-clamp and the 150 mm position for the final press stroke, all from one 40 mm bore tandem body.
Index parts to 50, 100 or 150 mm along a feed line with discrete, repeatable stops set purely by the two section strokes.
Choose the SCT40X50X100 when a single cylinder must park at three intermediate depths plus full extension - two separate SC cylinders or an SC with external stops would need extra brackets, alignment work and panel space. If your load needs more than the 628 N per-section push at 0.5 MPa, step up to the 50 mm bore (982 N push at 0.5 MPa); for lighter duty and tighter space, the 32 mm bore offers 402 N.
Ordering a replacement? Match the 40 mm bore, both strokes (50 mm and 100 mm), the PT port thread, the basic mounting style and the absence of the -S magnet option exactly. Both section strokes are well under 500 mm, so this is a standard catalogue build with no side-load concerns at normal guiding.
Multi-position checklist
Four. Because the two section strokes differ (50 mm and 100 mm), the rod can stop at 0 mm (retracted), 50 mm, 100 mm and 150 mm total travel. Each position is selected by pressurising section 1, section 2, or both. Force is per actuated section: 628 N push / 528 N pull at 0.5 MPa, up to 1130 N push at 0.9 MPa.
Yes - it does the job of two SC cylinders plus their mounting hardware in one 235 mm-long body, with no alignment of separate rods needed. For a like-for-like spare, match the 40 mm bore, both strokes (50 mm and 100 mm), the PT port thread, basic mounting and no magnet option. It is not an ISO 15552 cylinder and does not interchange with other brands.
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