The AirTAC Airtac SC40 Standard Cylinder SC40X125N 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 SC40X125N is a double-acting pneumatic cylinder from the AirTAC SC tie-rod series, delivering a push force of 628 N at 0.5 MPa and up to 1130 N at the maximum operating pressure of 0.9 MPa. With a 40 mm bore and a 125 mm stroke, this model features a 16 mm diameter piston rod and a body length A of 142 mm, making it a compact yet powerful solution for medium-force linear applications.
This specific model is built with NBR (nitrile) seals, offering reliable performance within the standard operating temperature range of -20 to +70 °C. The cylinder uses PT1/4 port threads and an M12x1.25 rod thread, and includes an adjustable pneumatic cushion (21 mm length) to decelerate the piston smoothly at the end of its stroke, reducing impact and noise.
| Model | Airtac SC40 Standard Cylinder SC40X125N |
|---|---|
| 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.
Ideal for actuating diverter gates on conveyor systems, where the 628 N push force at 0.5 MPa reliably redirects packages or materials between lines in packaging and logistics centers.
Provides consistent clamping force for medium-duty CNC machining fixtures and welding jigs, ensuring workpieces are held securely during automated manufacturing processes.
Used in automated sorting and grading equipment for produce, the 125 mm stroke effectively pushes items onto different tracks, with NBR seals performing well in standard agricultural environments.
For applications requiring slightly less force, consider stepping down to a 32 mm bore, which provides 402 N of push force at 0.5 MPa. If your load demands more power, the 50 mm bore model delivers 982 N at the same pressure. Always ensure the cylinder rod is protected from significant side loads, especially with this 125 mm stroke; an external guide or self-lubricating bearing should be used to prevent rod bending and premature seal wear.
When replacing an existing cylinder, ensure a perfect 5-point match: 40 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting (no integrated bracket), and the absence of a built-in magnet. This NBR-sealed variant is a direct replacement for other SC40X125N models.
Quick checklist
At the standard operating pressure of 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 increases to 1130 N. The theoretical maximum force at 1.0 MPa is 128 kgf.
No. The SC series is a double-acting cylinder and does not lock or hold its position when air pressure is exhausted or the directional valve is centered. The piston will drift or drop. For load holding without live pressure, you must add an external mechanical lock, a rod brake, or a pilot-operated check valve in the circuit.
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