The AirTAC Airtac SCD Standard Cylinder SCD250X350 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, 350mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X350 is a heavy-duty double-rod pneumatic cylinder that outputs an identical 23562 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design subtracting the 50 mm rod area from both piston faces. This symmetric force output, reaching 42412 N at the 0.9 MPa maximum operating pressure, makes it ideal for large fixtures where balanced motion is critical.
With a 350 mm stroke and a robust 435 mm body length A(SCD), this ISO 6430 class cylinder features a 50 mm diameter rod protruding from both end caps, providing inherent anti-rotation and the ability to mount tooling or sensors on the rear rod. The adjustable air cushion, with a 40 mm length, decelerates the high-inertia piston smoothly at each end of travel.
| Model | Airtac SCD Standard Cylinder SCD250X350 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 350 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. |
| ×350 | 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 push/pull force of 23562 N at 0.5 MPa ensures a heavy transfer shuttle moves with identical speed and power in both directions, simplifying flow control and timing.
A rear rod can actuate a secondary clamping mechanism or carry a sensor flag, while the main rod performs the primary clamp, all from a single, synchronized cylinder.
The through-rod design provides superior guidance for applying 42 kN of linear force at 0.9 MPa to straighten large structural members without twisting the piston assembly.
Select the SCD250X350 when your application demands balanced, high-force linear motion from both ends of the cylinder. If 23562 N at 0.5 MPa exceeds your requirement, step down to the 200 mm bore SCD200, which provides 15080 N. For applications needing only a single working end, the standard SC single-rod series is a more economical choice, though it will have unequal push and pull forces.
For a direct replacement, match the 250 mm bore, 350 mm stroke, PT port thread, and basic mounting configuration. The 350 mm stroke on this large bore requires careful management of the unsupported rod length under compressive or tensile loads; use an external linear guide or a dedicated guided cylinder if significant side forces are present to prevent rod bending and premature seal wear.
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. The theoretical force at 1.0 MPa is 4805 kgf.
Choose the SCD250X350 when you need perfectly balanced speed and force for a reciprocating load, or when you must mount a tool, stop, or position sensor on the rear rod. The through-rod also provides better bearing support than a single-rod cylinder, reducing deflection, though it is not a replacement for an external guide under high side loads.
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