The AirTAC Airtac SCD Standard Cylinder SCD125X250S 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, 250mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X250S is a double-acting, double-rod pneumatic cylinder delivering perfectly symmetrical force in both directions, calculated at 5734 N at 0.5 MPa. Its 32 mm diameter rod passes through both end caps, giving you a rear rod extension that is ideal for mounting a sensor flag, a mechanical stop, or secondary tooling. This model includes a built-in magnet, so CMSG, DMSG, or EMSG sensors can be clamped directly onto the tie-rod barrel for non-contact position sensing.
With a 250 mm stroke and a body length A of 291 mm, this cylinder is built for applications requiring balanced, repeatable motion. The adjustable pneumatic cushion at each end, with a 28 mm cushion length, decelerates the piston smoothly, reducing end-of-stroke impact. As a genuine AirTAC component, it operates on 40 µm filtered air at pressures from 0.15 to 1.0 MPa and is proof-tested to 1.5 MPa, making it a robust choice for industrial automation tasks that demand equal push and pull force.
| Model | Airtac SCD Standard Cylinder SCD125X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 250 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. |
| ×250 | 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 through-rod design allows a tooling plate to be mounted on the front rod while a counterbalance or secondary actuator is attached to the rear rod, creating a perfectly synchronized, two-sided transfer mechanism for moving parts between conveyor lanes.
With the built-in magnet and a rear rod extension, you can mount a CMSG or DMSG sensor on the barrel to detect piston position while using the rear rod end to trigger a secondary limit switch, providing redundant end-of-stroke confirmation for safety-critical systems.
Ideal for a press station requiring equal force for both the advance and retract strokes, such as inserting and then extracting a mandrel. The 5734 N of force at 0.5 MPa is consistent in both directions, ensuring a smooth, controlled process.
Select the SCD125 when your application needs roughly 5734 N of force in both directions at standard plant pressure. If you require a higher force output, stepping up to the SCD160 provides 9425 N at 0.5 MPa; for a lighter, more compact solution, the SCD100 delivers 3681 N. Remember that a double-rod cylinder is chosen for its functional rear rod and equal bidirectional force, not as a substitute for a guided cylinder. If your 250 mm stroke involves a significant side load, an external guide rail or a dedicated guided cylinder is necessary to prevent rod bending and premature seal wear.
For a direct replacement, match the 125 mm bore, 250 mm stroke, PT port thread, and basic mounting configuration. The integrated magnet on this -S variant must also be matched if your sensor setup relies on it. This SCD cylinder is a tie-rod design and does not share ISO 15552 mounting dimensions; it is a direct form-and-function replacement for an existing AirTAC SCD125X250S double-rod unit.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is calculated by subtracting the 32 mm rod area from the 125 mm bore area. This results in a force of 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need the piston rod to perform work on both ends of the cylinder, require perfectly equal push and pull force and speed, or want the enhanced bearing support and anti-rotation characteristics of a through-rod. A single-rod SC cylinder is the better choice if you only need force on one end and want a more compact overall length, as the SCD's rear rod adds to the cylinder's retracted footprint.
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