The AirTAC Airtac SCD Standard Cylinder SCD50X280S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 280mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X280S is a double-acting, double-rod pneumatic cylinder that outputs an identical 825 N of force in both directions at 0.5 MPa, thanks to its through-rod design where both piston faces lose the Ø20 mm rod area. This symmetry makes it ideal for applications where a tool or sensor flag must be mounted on the rear rod, or where balanced thrust is critical for consistent cycling.
At 280 mm of stroke, the SCD50X280S operates well within the 1200 mm maximum standard stroke for the 50 mm bore. It features a built-in magnet (denoted by the -S suffix), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel for precise, non-contact position sensing. The adjustable pneumatic cushion at each end, with a 21 mm cushion length, decelerates the piston smoothly, and the body length A(SCD) is 207 mm.
| Model | Airtac SCD Standard Cylinder SCD50X280S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 280 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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). |
|---|---|
| 50 | Bore size in mm. |
| ×280 | 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 rear rod can carry a second tooling plate or a counterbalance, enabling a single SCD50X280S to shuttle parts between two parallel conveyor lines with perfectly synchronized motion from both ends.
With the built-in magnet, a DMSG sensor on the rear tie-rod detects the piston's position without interfering with the front tooling, ideal for confirming full retraction in a space-constrained pick-and-place head.
The dual-rod guidance naturally resists rotation, making the SCD50X280S a reliable choice for pushing components into a press or fixture where any twisting of the pusher plate would cause a jam or misalignment.
Choose the SCD50 when you need the equal push/pull force of 825 N at 0.5 MPa that a double-rod design provides. If your application requires more force, stepping up to the SCD63 bore delivers 1402 N at the same pressure. If you only need to actuate from one end, a single-rod SC50 cylinder is a simpler, more compact choice. For applications with significant side loads, a guided cylinder is necessary, as the dual-rod design offers improved guidance over a single rod but is not a substitute for external load-bearing guides.
This SCD50X280S is a direct replacement for any AirTAC SCD50X280S cylinder with a PT port, basic mounting, and a built-in magnet. To ensure full compatibility, match the bore, stroke, port thread, and the -S magnet option. For strokes of 300 mm or greater, carefully evaluate the potential for rod bending on the unsupported rear rod extension and consider adding an external guide or switching to a guided cylinder.
Double-rod checklist
The push and pull forces are identical. At 0.5 MPa it outputs 825 N, at 0.7 MPa it's 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N. The theoretical force at 1.0 MPa is 168 kgf.
Choose the SCD50 when you need equal force and speed in both directions, or when you need to utilize the rear rod extension for mounting a sensor flag, a mechanical stop, or secondary tooling. The through-rod also provides better bearing support and inherent anti-rotation compared to a single-rod cylinder, making it suitable for tasks where rod twist must be minimized.
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