The AirTAC Airtac SCD Standard Cylinder SCD250X50S 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, 50mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X50S is a heavy-duty double-rod pneumatic cylinder delivering identical 23562 N of force in both push and pull directions at 0.5 MPa, thanks to its 50 mm through-rod that subtracts the same area from each chamber. With a short 50 mm stroke and a 435 mm body length, this cylinder provides a rigid, symmetric actuation platform for large tooling that requires a rear rod connection point.
Equipped with a built-in magnet (-S suffix), it allows CMSG, DMSG, or EMSG sensors to be mounted directly on the tie-rod barrel for non-contact position sensing. The 1-inch PT port and adjustable air cushion at each end cap manage the substantial kinetic energy of the 250 mm bore, ensuring controlled deceleration without any mechanical locking function.
| Model | Airtac SCD Standard Cylinder SCD250X50S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 50 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. |
| ×50 | 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.
Applies equal 23.5 kN force in both directions for symmetrical pressing, clamping, or forming operations where the work must be engaged from two sides simultaneously.
The rear rod extension carries a counterbalance or secondary tool, enabling a balanced shuttle table for moving large components between stations without asymmetric bearing wear.
The through-rod provides inherent anti-rotation stability, making it suitable for guiding alignment pins or mandrels in large-bore fixturing where any twist would cause misalignment.
This 250 mm bore model exerts 23562 N at 0.5 MPa. If your force requirement is lower, the SCD200 (15080 N at 0.5 MPa) with a 40 mm rod may be a better fit, reducing air consumption and physical weight. For applications needing only a single output point, the single-rod SC series is more economical, while any task with significant side loading demands a fully guided cylinder rather than relying solely on the double-rod's improved bearing support. For a drop-in replacement, match the 250 mm bore, 50 mm stroke, PT port thread, basic mounting, and the -S magnet option exactly.
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 is 32987 N, and at the maximum operating pressure of 0.9 MPa it reaches 42412 N in both directions.
Choose the SCD when you need a rear rod connection point for mounting tooling, stroke sensors, or a mechanical stop. It also provides equal force and speed in both directions and better guidance than a single-rod cylinder, though it is not a substitute for a fully guided unit under high side loads.
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