The AirTAC Airtac SCD Standard Cylinder SCD250X500S 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, 500mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X500S is a heavy-duty double-rod pneumatic cylinder engineered for applications demanding identical force and speed in both directions. With a 250 mm bore and 50 mm through-rod, it produces a symmetrical 23562 N of thrust at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa, making it suitable for large-scale pressing or lifting tasks where a rear rod connection is needed.
This model features a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for non-contact position sensing. The 500 mm stroke is within the standard range for this bore, and the adjustable air cushion at each end (40 mm length) decelerates the high-inertia piston smoothly. As an ISO 6430 class cylinder, it uses a PT1 inch port and an M42x2 rod thread, with a body length A(SCD) of 435 mm.
| Model | Airtac SCD Standard Cylinder SCD250X500S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 500 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. |
| ×500 | 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 makes this cylinder ideal for symmetrical pressing, clamping, or forming operations where the work must be engaged identically from two sides.
Utilize the rear rod extension to mount a secondary tool, counterbalance weight, or a stroke confirmation flag, enabling complex, synchronized motions from a single pneumatic actuator.
The through-rod design provides inherent anti-rotation and better guidance for shuttling heavy steel plates or lumber across transfer tables, maintaining alignment without a dedicated external guide.
Select the SCD250 bore when your application requires approximately 23562 N of balanced force at standard plant pressure. If your load is lighter, stepping down to the SCD200 bore reduces the force to 15080 N at 0.5 MPa, which can save on air consumption and physical space. This double-rod design is the correct choice when you need to attach tooling or a limit switch dog to the rear rod; if you only need a single working end, the standard SC single-rod cylinder is a more economical option.
For this 500 mm stroke, be mindful of the rod's unsupported length under compressive loading. While the through-rod provides better bearing support than a single-rod design, high side loads or long strokes can still cause rod deflection. In such cases, use an external linear guide or upgrade to a guided cylinder. To replace an existing unit, match the 250 mm bore, 500 mm stroke, PT port thread, basic mounting style, and the integrated magnet sensor option.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is calculated by subtracting the 50 mm rod area from the 250 mm bore area. This results in 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and 42412 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need a rear rod connection for mounting sensors, cams, or secondary tooling, or when you require perfectly equal force and speed in both directions. The through-rod also provides better support for the piston, reducing uneven seal wear in applications with frequent cycling, though it is not a substitute for a fully guided cylinder under heavy side loads.
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