The AirTAC Airtac SC40 Standard Cylinder SC40X250H is a genuine double-acting standard air cylinder with a Ø40mm bore and 250mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The SC40X250H is a double-acting pneumatic cylinder from the AirTAC SC tie-rod series, factory-equipped with Viton (FKM) seals for reliable operation in high-temperature environments up to 150°C. With a 40 mm bore and 250 mm stroke, it generates a theoretical push force of 628 N at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa, making it a strong mid-range actuator for heat-exposed automation tasks.
This model uses a 16 mm diameter piston rod with an M12x1.25 rod thread and PT1/4 ports. The cylinder body length (A) is 142 mm, giving a total extended length of approximately 392 mm. The adjustable air cushion at each end is 21 mm long, providing smooth deceleration without any mechanical locking function.
| Model | Airtac SC40 Standard Cylinder SC40X250H |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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. |
| ×250 | 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 allow this cylinder to operate continuously in ambient temperatures up to 150°C, ideal for foundry door actuators, autoclave loading systems, and drying oven transfer mechanisms where standard seals would fail.
With 1130 N of force at 0.9 MPa, the SC40X250H provides consistent clamping pressure for hot-melt gluing stations, heat-sealing jaws, and thermal forming presses in packaging and plastics industries.
The 250 mm stroke ejects hot-molded or cast parts from dies onto a cooling conveyor. The adjustable cushioning protects the tooling from impact damage at the end of stroke, even under rapid cycling.
Choose the SC40 bore when your application needs between 628 N and 1130 N of push force. If you require more force, step up to the SC50 bore which provides 982 N at 0.5 MPa; for a lighter, more compact solution, the SC32 bore delivers 402 N at the same pressure. The 250 mm stroke is well within the 1200 mm maximum standard stroke for this bore.
For a drop-in replacement, match five key attributes: 40 mm bore, 250 mm stroke, PT port thread, the basic (no bracket) mounting configuration, and the absence of a magnet. This H-suffix variant is specifically for high-temperature applications; ensure the replacement also carries the H code for Viton seals rated for 0 to 150°C.
Quick checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
No. The SC40X250H is a double-acting cylinder and will not hold its position if air pressure is lost or the directional valve is centered. The piston can drift or drop. For load holding, you must add an external rod brake, a mechanical lock, or a pilot-operated check valve.
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