The AirTAC Airtac SC40 Standard Cylinder SC40X125H is a genuine double-acting standard air cylinder with a Ø40mm bore and 125mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The SC40X125H is a double-acting pneumatic cylinder from the AirTAC SC tie-rod series, configured with a 40 mm bore and a 125 mm standard stroke. This model is fitted with high-temperature Viton (FKM) seals, extending the operating temperature range to 0–150 °C for hot or aggressive environments. At 0.5 MPa, it generates a push force of 628 N, making it a capable actuator for medium-duty automation tasks.
The cylinder features a 16 mm diameter piston rod with an M12x1.25 rod thread and PT1/4 pneumatic ports. Its adjustable air cushion, with a 21 mm cushion length, decelerates the piston smoothly at both ends of the stroke, reducing end-cap impact. The body length A is 142 mm, giving a total extended length of approximately 267 mm for this stroke.
| Model | Airtac SC40 Standard Cylinder SC40X125H |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| 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 | Up to 1200 mm |
Specifications follow the official AirTAC SC series datasheet. Operating pressure 0.15–1.0 MPa, proof pressure 1.5 MPa, temperature −20 to +70 °C. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (approx.) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SC | Standard tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related variants: SCD (double rod), SCJ (adjustable stroke), SCT (multi-position). Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Viton seals withstand 150°C steam cycles, making this cylinder ideal for actuating doors, locks, or lifts in autoclaves and sterilizers where standard seals would fail.
Reliably operates near ovens or furnaces to divert or stop hot parts on a conveyor. The 628 N push force at 0.5 MPa handles gates and diverters in high-temperature zones.
Suitable for clamping or ejecting in foundry patterns and glass mold machinery. The FKM seals resist the aggressive, high-heat environment common in these industries.
The SC40X125H is a strong fit for applications needing a compact actuator with reliable force in high-temperature zones. If your load requires more force, stepping up to the SC50 series provides 982 N of push force at the same 0.5 MPa pressure. For lower force requirements, the SC32 series offers 402 N.
For a direct replacement, ensure the new unit matches these five points: 40 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting (no integrated bracket), and no built-in magnet. This cylinder is a tie-rod design and is not dimensionally interchangeable with ISO 15552 profile cylinders. Always confirm the body length A (142 mm) and mounting hole pattern against your existing setup.
Quick checklist
At the standard operating pressure of 0.5 MPa, the cylinder provides a push force of 628 N and a pull force of 528 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 1130 N. The theoretical maximum force at 1.0 MPa is 128 kgf.
No. Like all standard double-acting cylinders, the SC40X125H will drift or drop its load if air pressure is lost or the directional valve is centered. The adjustable air cushion only decelerates the piston at the end of stroke; it is not a locking or holding brake. For load holding, you must add an external rod lock or a pilot-operated check valve.
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