The AirTAC Airtac SCD Standard Cylinder SCD250X800 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, 800mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X800 is a heavy-duty double-rod pneumatic cylinder engineered for applications that demand identical force and speed in both directions. With a 250 mm bore and an 800 mm stroke, it outputs a substantial 23562 N of thrust each way at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa. The 50 mm diameter piston rod extends from both ends, providing a robust platform for mounting tooling, sensors, or mechanical stops on the rear side.
This tie-rod cylinder features an adjustable pneumatic cushion (40 mm length) at each end to decelerate high-inertia loads smoothly. The body length A(SCD) is 435 mm, and the retracted length is longer than a comparable single-rod model due to the dual rod extensions. It operates on 40 µm filtered air within a standard temperature range of -20 to +70 °C and uses a PT1 inch port for high flow.
| Model | Airtac SCD Standard Cylinder SCD250X800 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 800 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. |
| ×800 | 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 23.6 kN force in both directions makes this cylinder ideal for large transfer shuttles that move heavy steel components between two stations, ensuring consistent cycle times.
Use the rear rod to mount a counter-platen for a balanced compression fixture, applying identical forming pressure from both sides of a workpiece simultaneously.
The twin 50 mm rods provide inherent anti-rotation stability, perfect for a vertical lifting beam on a gantry where twisting must be prevented without external guides.
Choose the SCD250X800 when your application requires a massive, balanced force output on both the extend and retract strokes, such as driving a large shuttle table or a dual-sided press platen. If your force calculation is slightly lower, stepping down to the 200 mm bore SCD200 series provides 15080 N at 0.5 MPa, which may offer a more economical solution. For applications needing only a single working direction, the standard SC250 single-rod cylinder is a simpler and more cost-effective alternative.
For an 800 mm stroke, carefully manage side loads. The 50 mm rod provides excellent guidance, but an unsupported long stroke can still experience rod deflection under heavy radial forces. Use an external linear guide or switch to a dedicated guided cylinder if the load is not perfectly axial. This model is a direct replacement for an existing AirTAC SCD250X800 unit with a basic mount, PT ports, and no magnet, matching bore, stroke, and port configuration exactly.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is reduced by the 50 mm rod on both sides. At 0.5 MPa you get 23562 N, at 0.7 MPa you get 32987 N, and at the maximum operating pressure of 0.9 MPa, the force is 42412 N in both directions.
Select the SCD250X800 when you need to mount a tool, sensor flag, or mechanical stop on the rear rod, or when your process demands perfectly symmetrical force and speed for both the extend and retract movements. The through-rod design also provides better guidance and anti-rotation than a single-rod cylinder, but it is physically longer and more expensive.
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