The AirTAC Airtac SCD Standard Cylinder SCD250X300 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, 300mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X300 is a heavy-duty double-rod pneumatic cylinder engineered for applications demanding identical thrust in both directions. With a 250 mm bore and a 50 mm rod passing through both end caps, it generates an equal 23562 N of force for both push and pull strokes at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa. The 300 mm stroke provides substantial linear travel, while the 40 mm adjustable air cushion at each end decelerates the large piston mass smoothly.
This ISO 6430 class tie-rod cylinder features a G1 inch port and an M42x2 knuckle thread on both rod ends, allowing tooling or sensors to be mounted on the rear rod. The through-rod design improves bearing support and resists rotation better than a single-rod cylinder, though for true side-load applications an external guide should be added. Its retracted body length A is 435 mm, making it a substantial but manageable unit for integration into large-scale industrial machinery.
| Model | Airtac SCD Standard Cylinder SCD250X300 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 300 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. |
| ×300 | 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.
Moves large steel plates or weldments between stations with identical speed and force in both directions, using the rear rod to trigger limit switches for precise end-of-stroke confirmation.
Powers a central platen in a laminating or forming press where tooling is mounted on both the front and rear rods, doubling throughput by processing two parts per cycle.
The dual-rod support provides inherent anti-rotation, making it suitable for ejecting or positioning wide, heavy components on a conveyor without adding a separate external guide assembly.
Select the SCD250X300 when your mechanism requires balanced, high-force actuation from both sides of the piston. If the 23562 N output at 0.5 MPa exceeds your structural limits, stepping down to the 200 mm bore SCD series reduces the force to 15080 N. Conversely, if your load demands even greater thrust, this is the largest standard double-rod cylinder in the AirTAC range. For a 300 mm stroke, always assess the potential for rod bending under compressive load; the 50 mm diameter rod provides significant stiffness, but an external guide rail or a switch to a guided cylinder is recommended if the load is not perfectly axial. As a direct replacement, match the 250 mm bore, 300 mm stroke, PT port thread, basic mounting, and ensure the original unit was also a double-rod SCD model.
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 delivers 32987 N, and at the maximum operating pressure of 0.9 MPa the force is 42412 N.
Choose the SCD double-rod design when you need equal force and speed in both directions, or when you require a rear rod extension to mount a sensor flag, a mechanical stop, or secondary tooling. The through-rod also provides better guidance and inherent anti-rotation compared to a standard single-rod cylinder.
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