The AirTAC Airtac SCD Standard Cylinder SCD250X80 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, 80mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X80 is a heavy-duty double-acting pneumatic cylinder engineered for tasks demanding identical force in both directions. With a 250 mm bore and 50 mm through-rod, it generates 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.
This 80 mm stroke model features a 40 mm adjustable air cushion at each end to decelerate large inertial loads smoothly. The tie-rod construction provides a robust body length A of 435 mm, and the G1 inch port supplies ample flow for the 30-500 mm/s speed range typical of this ISO 6430 class cylinder.
| Model | Airtac SCD Standard Cylinder SCD250X80 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 80 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. |
| ×80 | 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.
Provides equal 23.5 kN push and pull to transfer large pallets or steel plates between stations, ensuring consistent cycle times in both directions.
The rear rod can be used to operate a secondary tool or stripper plate in a large forming press, synchronizing perfectly with the main ram force.
Applies a controlled, bidirectional tensile load for testing large cables, chains, or structural components where force must be equal in both stroke directions.
Select the SCD250X80 when your application requires a massive, perfectly symmetrical force output that a single-rod cylinder cannot provide. If 23562 N at 0.5 MPa exceeds your requirement, stepping down to the 200 mm bore SCD200 series offers 15080 N. For applications involving significant off-axis loads, even this large through-rod is not a substitute for an external guide system; consider adding a linear guide rail. A direct replacement must match the 250 mm bore, 80 mm stroke, G1 PT port, and the specific SCD mounting accessory if one is fitted.
Double-rod checklist
The push and pull forces are identical due to the double-rod design. At 0.5 MPa it is 23562 N, at 0.7 MPa it is 32987 N, and at the 0.9 MPa maximum operating pressure it reaches 42412 N.
Choose the SCD250 when you need a rear rod extension to mount a sensor flag, a mechanical stop, or a second tool. It also provides better rod guidance and eliminates the force differential between extend and retract strokes found in a single-rod cylinder.
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