The AirTAC Airtac SC40 Standard Cylinder SC40X391 is a genuine double-acting standard air cylinder with a Ø40mm bore and 391mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The AirTAC SC40X391 is a double-acting tie-rod cylinder with a 40 mm bore and a non-standard stroke of 391 mm. Operating at 0.5 MPa, it provides a push force of 628 N and a pull force of 528 N, making it suitable for medium-duty linear tasks. The 16 mm diameter piston rod offers good rigidity for this stroke length, while the adjustable pneumatic cushion at each end decelerates the piston smoothly over the final 21 mm of travel.
This model features a PT1/4 port and an M12x1.25 rod thread. With a body length A of 142 mm, the total extended length is approximately 533 mm. As a non-standard stroke exceeding the 1200 mm maximum standard for this bore, this unit is a made-to-order configuration. It comes with the default TPU seals for a standard operating temperature range of -20 to +70 °C and does not include a built-in magnet.
| Model | Airtac SC40 Standard Cylinder SC40X391 |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 391 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. |
| ×391 | 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.
The 391 mm stroke and 628 N push force effectively actuate diverter gates on medium-width conveyor lines, reliably sorting packages without excessive force.
Ideal for jigs and fixtures requiring a controlled 391 mm reach. The adjustable cushioning protects delicate workpieces from impact damage during high-speed clamping cycles.
Provides a stable 528 N pulling force for lifting and lowering medium-weight bins or totes in automated storage and retrieval systems, with the 391 mm stroke covering a deep reach.
For applications needing slightly more force, consider stepping up to the 50 mm bore SC50 series, which offers 982 N of push force at 0.5 MPa. For a lighter, more compact solution, the 32 mm bore SC32 provides 402 N. With a stroke of 391 mm, the 16 mm rod is susceptible to bending under side loads; always guide the load externally or use a guided cylinder if lateral forces are present.
To ensure a correct replacement, match five key points: the 40 mm bore, the 391 mm stroke, the PT1/4 port thread, any required mounting accessory (this is a basic model without a bracket), and the absence of a magnet. This SC40X391 is dimensionally identical only to another AirTAC SC tie-rod cylinder with the same specifications.
Quick checklist
At an operating pressure of 0.7 MPa, the SC40X391 double-acting cylinder produces a theoretical push force of 879 N and a pull force of 738 N (calculated from the 528 N pull force at 0.5 MPa).
No, the maximum standard stroke for a 40 mm bore SC cylinder is 1200 mm, but 391 mm is not one of the standard stroke increments. This is a non-standard, made-to-order stroke length.
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