The AirTAC Airtac SCD Standard Cylinder SCD50X125S 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X125S is a double-acting, double-rod pneumatic cylinder that provides identical 825 N output force in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod occupies both pressure areas equally. This 125 mm stroke model includes a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact end-of-stroke or mid-stroke position sensing.
With a PT1/4 port, an M16x1.5 rod thread on both ends, and a 21 mm adjustable air cushion, the SCD50X125S decelerates the piston smoothly at each stroke end. The body length A(SCD) is 207 mm, and the cylinder operates reliably on filtered air between 0.15 and 1.0 MPa across a -20 to +70 °C temperature range.
| Model | Airtac SCD Standard Cylinder SCD50X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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. |
| ×125 | 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 825 N push and pull force moves a shuttle table or transfer cart in both directions with consistent speed, while the rear rod can trigger a limit switch for precise positioning.
Use the through-rod to drive a clamping jaw from the rear while the front rod actuates the primary clamp, creating a balanced, anti-rotation clamping station for assembly jigs.
The rear rod extension acts as a mechanical stop or carries a sensor flag, giving you stroke confirmation without adding a separate bracket, ideal for compact conveyor gate systems.
Choose the SCD50X125S when you need a symmetric 825 N force at 0.5 MPa and a rear rod end for mounting a sensor flag, stopper, or secondary tooling. If your application demands higher thrust, stepping up to the 63 mm bore provides 1402 N at the same pressure. For loads that only require actuation from one side, the single-rod SC50 series is a lighter, more compact alternative. This double-rod cylinder offers improved bearing support compared to a single-rod design, but it is not a guided cylinder; if the 125 mm stroke exposes the rod to significant side loads, add an external linear guide.
As a direct replacement, match an existing AirTAC SCD50 cylinder with the same 50 mm bore, 125 mm stroke, PT port thread, basic mounting, and the -S magnet option. The sensor-ready barrel ensures drop-in compatibility with your current reed or solid-state switch setup.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it outputs 825 N, at 0.7 MPa it delivers 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N in both directions.
Choose the SCD when you need identical force and speed in both directions, or when you want to use the rear rod extension to mount a sensor target, a mechanical stop, or secondary tooling. The through-rod also provides better guidance and reduces bushing wear compared to a cantilevered single rod, though it is not a substitute for an external guide under heavy side loads.
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