The AirTAC Airtac SCD Standard Cylinder SCD250X450S 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, 450mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X450S is a heavy-duty double-rod pneumatic cylinder that provides exactly 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 symmetry eliminates force differentials, making it ideal for large fixtures that need balanced power on the extend and retract strokes.
With a 450 mm stroke and a robust 50 mm diameter rod protruding from both end caps, this model includes a built-in magnet (denoted by the -S suffix) so you can mount CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for end-of-stroke detection. The adjustable air cushion on each end is 40 mm long, providing smooth deceleration for high-inertia loads at speeds up to 500 mm/s.
| Model | Airtac SCD Standard Cylinder SCD250X450S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 450 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. |
| ×450 | 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 force in both directions drives a heavy transfer shuttle smoothly without speed differences between the forward and return strokes, critical for timed automation cells.
Mount forming dies on both ends of the through-rod to perform two operations in one cycle, such as a pre-form and final form, using the 23.6 kN force at 0.5 MPa.
The rear rod extension provides a convenient place to attach a sensor flag or cam for stroke confirmation when the front end is enclosed, enabled by the integrated magnet.
Choose the SCD250 bore when your application demands approximately 23.6 kN of force at standard plant pressure. If you can accept lower output, stepping down to the SCD200 saves space and cost while still delivering 15080 N at 0.5 MPa. For applications where only one side of the piston needs to do work, a single-rod SC series cylinder is a simpler, more compact alternative. This double-rod unit is a direct dimensional replacement only for another AirTAC SCD250 of the same stroke, PT port thread, and basic mounting style. For a 450 mm stroke, ensure the long unsupported rod sections are not subjected to significant side loads; if lateral forces are present, pair the cylinder with an external linear guide or switch to a dedicated guided cylinder.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa you get 23562 N, at 0.7 MPa it is 32987 N, and at the maximum operating pressure of 0.9 MPa it reaches 42412 N.
You would choose the SCD when you need perfectly equal speed and force in both directions, or when you require a rear rod extension to mount tooling, a stopper, or a sensor target. The dual-rod support also provides better guidance against side loads than a single-rod cylinder, though it is not a replacement for an externally guided unit under high lateral forces.
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