The AirTAC Airtac SCD Standard Cylinder SCD125X250 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 SCD125X250 is a double-acting, double-rod pneumatic cylinder delivering perfectly symmetrical force in both directions. With a 125 mm bore and a 32 mm through-rod, it generates 5734 N of thrust each way at 0.5 MPa, making it ideal for applications where a rear rod connection is needed for cams, flags, or dual-sided tooling.
This ISO 6430 class tie-rod cylinder has a 250 mm stroke and an adjustable air cushion of 28 mm at each end for smooth deceleration. The body length A(SCD) is 291 mm, and the G1/2 ports ensure ample flow. Its dual-rod guidance provides better side-load resistance than a single-rod cylinder, though external guides are still recommended for heavy offset loads.
| Model | Airtac SCD Standard Cylinder SCD125X250 |
|---|---|
| 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 equal force in both directions and rear rod access make this cylinder perfect for driving shuttle tables where tooling or sensors mount on both sides of the piston.
Achieve balanced clamping pressure from two opposing sides using a single SCD125X250, with the through-rod providing a convenient attachment point for a secondary clamp arm.
Use the front rod for the primary pressing operation and the rear rod extension to trigger a limit switch or drive a secondary lubrication pump, all from one cylinder.
Select the SCD125X250 when your mechanism requires equal push and pull force and a rear rod extension. If 5734 N at 0.5 MPa exceeds your need, the smaller SCD100 bore provides 3681 N. For higher force, step up to the SCD160 which delivers 9425 N. If you only need force from one end, the single-rod SC125X250 is a simpler, more compact alternative.
At a 250 mm stroke, rod buckling is rarely a concern for this 32 mm rod under axial loads, but any significant side force requires an external guide rail. For a drop-in replacement, match the 125 mm bore, 250 mm stroke, PT port thread, and ensure your mounting accessory is from the SCD subset (Basic, FA, LB, or TC).
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. 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 delivers 10321 N of force in both directions.
Choose the SCD when you need to mount tooling, a stop, or a sensor target on the rear end of the cylinder, or when you require perfectly equal speed and force for the extend and retract strokes. The through-rod also provides better bearing support than a single-rod design, reducing rod deflection.
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