The AirTAC Airtac SCD Standard Cylinder SCD250X900S 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 SCD250X900S is a heavy-duty double-rod pneumatic cylinder engineered for applications demanding perfectly symmetrical force in both directions. With a 250 mm bore and a 50 mm through-rod, it produces an identical 23562 N of thrust on the extend and retract strokes when supplied with 0.5 MPa air, eliminating the force imbalance inherent in single-rod designs. The 900 mm stroke is well within the 1500 mm maximum for this ISO 6430 class tie-rod body, whose retracted envelope is defined by a 435 mm body length A(SCD).
This model is factory-equipped with a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the barrel for non-contact end-of-stroke or mid-position sensing. The rear rod extension provides a convenient mounting point for a secondary tool, a hard stop, or a sensor flag, while also improving bearing load distribution compared to a single-rod cylinder of similar size. Both ports are PT 1 inch, and the adjustable air cushion at each end decelerates the high-inertia piston mass smoothly.
| Model | Airtac SCD Standard Cylinder SCD250X900S |
|---|---|
| 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.
Delivers equal 23562 N force in both directions for pressing, stamping, or clamping fixtures where the return stroke must match the working stroke precisely.
Moves large pallets or steel plates on a transfer line, using the rear rod to trigger a limit switch or drive a secondary ejector mechanism in perfect synchronization.
Applies a controlled, identical pull force from both ends for material tensile testing rigs or for tensioning large belts and chains without a fixed anchor point.
Select the SCD250 when you need the highest force output in the SCD family and absolutely equal push-pull thrust. At 0.5 MPa, its 23562 N output is a substantial step up from the SCD200, which generates 15080 N under the same pressure. If your application only requires force in one direction, a single-rod SC250 would be a more economical choice, as it provides a higher push force by using the full piston area. For strokes at or near this 900 mm length, carefully evaluate the bending moment on the exposed 50 mm rod; an external guide rail or a switch to a guided cylinder is recommended if the load is not perfectly axial. This unit is a direct dimensional replacement only for another AirTAC SCD250 of the same stroke, port thread (PT), and magnet option.
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 produces 42412 N in both directions.
Choose the SCD when you need perfectly equal speed and force in both directions, or when you need a rear rod extension to mount tooling, a brake, or a position sensor flag. The through-rod design also provides better support for the piston, reducing bearing wear in high-cycle applications, though it does not replace a fully guided cylinder for heavy side loads.
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