The AirTAC Airtac SCD Standard Cylinder SCD250X900 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø50mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø250mm bore, 900mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X900 is a heavy-duty double-rod pneumatic cylinder that produces an identical 23562 N of thrust in both directions at 0.5 MPa, thanks to its 50 mm rod passing through both end caps. At the maximum operating pressure of 0.9 MPa, output climbs to 42412 N each way, making it suitable for large-scale tooling that demands balanced force and speed on the extend and retract strokes.
With a 900 mm stroke and a robust tie-rod construction, this ISO 6430 class cylinder features a 40 mm adjustable air cushion at each end to decelerate high-inertia loads. The through rod provides superior bearing support and allows mounting of sensors, stripper plates, or a rear stroke-adjustment stop, giving designers a symmetric actuation platform for demanding industrial tasks.
| Model | Airtac SCD Standard Cylinder SCD250X900 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 900 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 23562 N | 23562 N |
| 0.7 MPa | 32987 N | 32987 N |
| Max (@1.0 MPa) | 4805 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×900 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Drives large heated press platens with equal force and speed in both closing and opening directions, ensuring uniform pressure distribution across the full 900 mm stroke.
Moves loaded pallets between conveyor lanes using the rear rod to mount a counterbalance or a secondary sensor flag, keeping the shuttle motion balanced and trackable at both ends.
Applies 42 kN of controlled force from both ends of the cylinder in a straightening fixture, using the through rod to link two opposing tooling heads for simultaneous operation.
Select the SCD250X900 when your application requires equal push and pull force in the 23.5 kN range at standard plant pressure. If your force requirement is closer to 15 kN, stepping down to the SCD200 bore (15080 N at 0.5 MPa) can reduce air consumption and physical footprint. For strokes of 900 mm, always evaluate the unsupported rod column; the double-rod design improves guidance over a single-rod cylinder, but significant side loads still demand an external guide rail or a dedicated guided cylinder.
As a direct replacement, match an existing AirTAC SCD cylinder on all five key points: 250 mm bore, 900 mm stroke, PT port thread, the specific SCD mounting accessory (such as the F-SC250TC centre trunnion if pivoting), and the presence or absence of the -S magnet option. This ensures drop-in interchangeability without modifying your machine's bracketry or sensor setup.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 23562 N, at 0.7 MPa it produces 32987 N, and at the maximum operating pressure of 0.9 MPa it delivers 42412 N in both directions.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you need to attach tooling, a stop, or a sensor target to the rear rod. The through rod also provides better support for the piston, reducing bearing wear compared to a single-rod cylinder under the same conditions, though it is not a replacement for an externally guided unit under high side loads.
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