The AirTAC Airtac SC40 Standard Cylinder SC40X840 is a genuine double-acting standard air cylinder with a Ø40mm bore and 840mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The SC40X840 is a double-acting pneumatic cylinder from the AirTAC SC tie-rod series, delivering 628 N of push force and 528 N of pull force when operated at 0.5 MPa. With an 840 mm stroke and a 16 mm diameter piston rod, it is well-suited for medium-reach linear tasks such as material transfer, pressing, or clamping in automated machinery.
This model features a 142 mm body length (dimension A) and an adjustable air cushion of 21 mm at each end to decelerate the piston smoothly. The PT1/4 port and M12x1.25 rod thread ensure straightforward pneumatic connections. As a genuine AirTAC component, it is built for reliable service with filtered air at pressures from 0.15 to 1.0 MPa.
| Model | Airtac SC40 Standard Cylinder SC40X840 |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 840 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. |
| ×840 | 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.
Moves components 840 mm between conveyor lines or workstations, using the 16 mm rod to push or pull trays and fixtures.
Applies up to 1130 N at 0.9 MPa for gentle assembly presses, bearing insertion, or label application over a long working distance.
Directs products down different chutes with an 840 mm reach, benefiting from the adjustable cushion for quiet, low-impact end-of-stroke stops.
Select the SC40X840 when your application requires a stroke under the 1200 mm maximum standard limit for 40 mm bore cylinders and a push force around 628 N at 0.5 MPa. If you need more force, stepping up to a 50 mm bore (SC50) provides 982 N at the same pressure. For a lighter, more compact solution, the 32 mm bore (SC32) offers 402 N.
For this 840 mm stroke, ensure the load is guided externally if any side forces are present, as the 16 mm rod can be subject to bending under off-axis loads. When replacing an existing cylinder, match five points: 40 mm bore, 840 mm stroke, PT1/4 port thread, basic (no bracket) mounting, and the absence of a built-in magnet.
Quick checklist
At 0.5 MPa the push force is 628 N, at 0.7 MPa it is 879 N, and at the maximum operating pressure of 0.9 MPa it reaches 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
It is recommended only for purely axial loads. The 16 mm rod on an 840 mm stroke is vulnerable to bending under side load. For any off-axis force, use an external guide rail or a guided cylinder to protect the rod bearings and seals.
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