The AirTAC Airtac SCD Standard Cylinder SCD250X250S 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, 250mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X250S is a heavy-duty double-rod pneumatic cylinder engineered for applications demanding identical push and pull force. With a 250 mm bore and a 50 mm rod extending from both ends, it delivers a substantial 23562 N of thrust in either direction when supplied with 0.5 MPa air pressure, rising to 42412 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for non-contact position feedback. The 250 mm stroke is well within the 1500 mm maximum for this bore, and the adjustable air cushion at each end (40 mm length) provides smooth deceleration. The body length A(SCD) is 435 mm, making it a substantial unit suited for symmetric tooling or rear-mounted stroke sensing on large-scale industrial equipment.
| Model | Airtac SCD Standard Cylinder SCD250X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 250 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. |
| ×250 | 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.
Ideal for large-scale clamping fixtures where equal force must be applied from both sides of a workpiece simultaneously, using the front and rear rod ends for twin tooling plates.
Provides the balanced thrust needed to move heavy pallets or steel components on a transfer line, with the rear rod available to mount a secondary stopper or a sensor flag for end-of-stroke confirmation.
The dual-rod design inherently resists rotation, making it suitable for pushing wide, heavy parts like engine blocks or large castings onto a machining centre without a separate anti-rotation guide.
Select the SCD250X250S when your application requires a balanced, high-force output in both directions and a through-rod for rear-mounted accessories. If your force requirement is lower, stepping down to the 200 mm bore SCD model reduces the force output to 15080 N at 0.5 MPa, which may offer a more compact and cost-effective solution. For applications with significant side loads, remember that while the double rod provides better guidance than a single rod, it is not a replacement for a fully guided cylinder with external bearings.
As a direct replacement, this unit matches any existing AirTAC SCD250X250S in bore, 250 mm stroke, PT port thread, basic mounting, and the integrated magnet. For strokes of 300 mm or more, carefully assess the potential for rod bending under compressive load on the unsupported rod end and consider adding an external guide rail to protect the cylinder.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 23562 N, at 0.7 MPa it's 32987 N, and at the maximum operating pressure of 0.9 MPa, the force is 42412 N in both directions.
You would choose an SCD model like this one when you need perfectly equal force and speed in both directions, or when you need the rear rod extension to mount tooling, a limit switch dog, or a mechanical stop. The through-rod also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder under certain conditions.
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