The AirTAC Airtac SCD Standard Cylinder SCD250X25 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, 25mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X25 is a large-bore double-rod pneumatic cylinder that produces an identical 23562 N of force in both the extend and retract strokes at 0.5 MPa, thanks to its through-rod design. With a substantial 50 mm rod diameter and a 40 mm adjustable air cushion, it handles high-inertia loads with controlled deceleration at stroke end.
This 25 mm stroke variant is often used for clamping, pressing, or precise short-travel positioning where the rear rod extension is needed to mount a sensor flag, a mechanical stop, or secondary tooling. The body length A(SCD) is 435 mm, and the cylinder operates on 40 µm filtered air across a 0.15–1.0 MPa pressure range.
| Model | Airtac SCD Standard Cylinder SCD250X25 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 25 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. |
| ×25 | 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.
The equal 23562 N force in both directions provides balanced, controlled clamping pressure for large weld fixtures or assembly jigs.
The 25 mm stroke and through-rod rigidity are ideal for pressing bearings or bushings where a rear rod can actuate an ejection mechanism.
Identical push/pull force ensures a heavy sliding gate or diverter moves with the same power in both directions, preventing uneven wear.
For a step down in force, the SCD200X25 provides 15080 N at 0.5 MPa, while the SCD250X25 delivers 23562 N. If your application only requires force at one end, a single-rod SC250 cylinder may reduce cost and space. A direct replacement must match the 250 mm bore, 25 mm stroke, PT port thread, and the basic mounting configuration; adding the -S magnet option enables CMSG/DMSG sensor mounting.
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 is 32987 N, and at the maximum operating pressure of 0.9 MPa it reaches 42412 N.
A double-rod cylinder like the SCD250X25 provides equal force and speed in both directions and allows you to mount tooling or sensors on the rear rod. The through-rod also improves guiding and resistance to bending compared to a single-rod cylinder of the same bore.
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