The AirTAC Airtac SCD Standard Cylinder SCD125X25S 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, 25mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X25S is a double-acting, double-rod pneumatic cylinder from AirTAC, built on a robust tie-rod design. Its defining characteristic is the 32 mm piston rod that extends from both ends, creating identical effective piston areas in each direction. This means the push and pull force are perfectly balanced, delivering 5734 N at 0.5 MPa supply pressure, a feature critical for applications demanding symmetrical motion.
This specific model includes a built-in magnet (-S suffix), allowing easy attachment of CMSG, DMSG, or EMSG reed and solid-state sensors directly to the barrel for precise, non-contact end-of-stroke detection. With a short 25 mm stroke and a body length A of 291 mm, it's an ideal actuator for compact, two-sided clamping or ejector mechanisms where space is limited but high force is non-negotiable.
| Model | Airtac SCD Standard Cylinder SCD125X25S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 25 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. |
| ×25 | 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 push/pull force makes this cylinder perfect for two-sided clamping fixtures where both jaws must apply identical pressure simultaneously, ensuring even part holding without distortion.
The built-in magnet and rear rod extension allow a sensor to be mounted on the back, using the rear rod's movement as a precise flag to confirm the cylinder's position in a hard-to-access area.
With 10321 N of thrust at 0.9 MPa, this short-stroke double-rod unit is ideal for a compact, high-force ejector mechanism, pushing a finished part off a die or out of a mold with a guided, non-rotating motion.
Choose the SCD125 bore when your application requires a balanced force output of around 5734 N at 0.5 MPa in both directions. If your force requirement is lower, stepping down to an SCD100 bore provides 3681 N of equal push/pull force, which may offer cost and space savings. For applications needing only a single working end, a standard SC single-rod cylinder is a simpler choice. This SCD is a direct replacement for an existing AirTAC SCD125 double-rod unit, provided the bore, 25 mm stroke, PT port thread, basic mounting, and magnet option match exactly.
Double-rod checklist
Because it's a double-rod cylinder, the push and pull forces are identical. The force is 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and reaches 10321 N at the maximum operating pressure of 0.9 MPa.
You'd choose an SCD double-rod cylinder when you need perfectly equal force and speed in both directions, or when you need to mount a tool, stopper, or sensor flag on the rear rod. The through-rod design also provides better guidance and inherent anti-rotation compared to a single-rod cylinder.
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