The AirTAC Airtac SCD Standard Cylinder SCD250X350S 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 AirTAC SCD250X350S is a heavy-duty double-rod pneumatic cylinder that provides exactly 23562 Newtons of thrust in both directions at 0.5 MPa, eliminating the force asymmetry of a single-rod design. Its 50 mm diameter rod passes through both end caps, giving you a robust rear extension for mounting stroke sensors, a mechanical stop, or secondary tooling while the front rod does the primary work.
This model includes a built-in magnet (-S suffix), so you can directly clamp CMSG, DMSG, or EMSG reed or solid-state sensors onto the tie-rod barrel for reliable end-of-stroke detection. With a 350 mm stroke, it operates comfortably within the 1500 mm maximum standard stroke for this bore, and the adjustable air cushion (40 mm length) decelerates the massive piston smoothly at each end of travel.
| Model | Airtac SCD Standard Cylinder SCD250X350S |
|---|---|
| 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.
Pushes and pulls a heavy pallet lift table with equal force, using the rear rod to trigger a limit switch confirming the home position.
Drives a two-sided compaction plate in a waste baler, applying 23562 N of force symmetrically to compress material from both sides simultaneously.
Actuates a large welding jig where the front rod clamps the workpiece and the rear rod drives a synchronized ejector pin, all from one cylinder body.
Choose the SCD250 when your application demands equal, high-force output in both directions—here 23562 N at 0.5 MPa. If your load requires less force, the SCD200 bore delivers 15080 N at the same pressure, offering a more compact and cost-effective alternative. For even higher thrust, the SCD250 is the largest standard double-rod cylinder in the AirTAC range. If you only need force on the push stroke, a single-rod SC250 cylinder would be a simpler choice, as it provides a higher push force by using the full piston area. For a drop-in replacement, match the 250 mm bore, 350 mm stroke, PT port thread, basic mounting, and the -S magnet option; any substitute must be another AirTAC SCD double-rod unit to guarantee identical form, fit, and function. At this 350 mm stroke, the long, unsupported 50 mm rod on both ends is susceptible to bending under high side loads—always use an external linear guide or a dedicated guided cylinder if the load is not perfectly axial.
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 equal force and speed in both directions, or when you require a rear rod extension to mount sensors, stops, or secondary tooling. The through-rod design also provides better bearing support and inherent anti-rotation compared to a single-rod cylinder, but it does not replace a dedicated guided cylinder for high side loads.
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