The AirTAC Airtac SCD Standard Cylinder SCD125X300S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 300mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X300S is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions—5734 N at 0.5 MPa and up to 10321 N at the maximum operating pressure of 0.9 MPa. Its 32 mm diameter rod extends from both ends, making it a natural fit for tasks that need a rear connection point for a limit switch flag, a mechanical stop, or secondary tooling without adding external brackets.
The built-in magnet (denoted by the -S suffix) lets you clamp CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the tie-rod barrel for precise, non-contact end-of-stroke detection. With a 28 mm adjustable air cushion and a body length A(SCD) of 291 mm, the cylinder decelerates heavy loads smoothly at each end, protecting the end caps during high-cycle operation.
| Model | Airtac SCD Standard Cylinder SCD125X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 300 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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, 28 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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.
With a rod protruding from both ends, the SCD125X300S can push a workpiece carrier in one direction and simultaneously pull a second fixture on the opposite side, doubling the productivity of a transfer line station.
The dual-rod support naturally resists piston rotation, making this cylinder a solid choice for simple press-fit or stamping operations where a rotating rod would misalign the tooling.
The -S magnet and exposed rear rod allow you to mount a sensor flag on the back end. This keeps the front work area clear while still providing reliable end-of-stroke signals to the PLC via a barrel-mounted DMSG sensor.
This 125 mm bore model provides a substantial 5734 N of thrust at 0.5 MPa, sitting between the 80 mm bore (2268 N) and the 160 mm bore (9425 N) in the SCD family. If your application requires more force, stepping up to the SCD160 will nearly double the output; if you need a faster cycle and can accept less force, the SCD100 is a lighter alternative. For applications with significant side loading, remember that the through-rod improves guidance but does not eliminate the need for an external guide or a dedicated guided cylinder, especially with this 300 mm stroke.
When replacing an existing SCD125X300S, match all five points: 125 mm bore, 300 mm stroke, PT port thread, the specific SCD mounting accessory (if any), and the -S magnet for sensor compatibility. A standard single-rod SC cylinder cannot provide the rear rod access or the perfectly symmetric force output this double-rod design guarantees.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it produces 5734 N, at 0.7 MPa it produces 8028 N, and at the maximum operating pressure of 0.9 MPa it reaches 10321 N in both directions.
Choose the SCD when you need a rear rod end to mount a sensor flag, a mechanical stop, or secondary tooling. It also provides equal force and speed in both directions and better inherent rod guidance, which helps reduce bushing wear in high-cycle, straight-line push-pull applications.
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