The AirTAC Airtac SCD Standard Cylinder SCD125X450S 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, 450mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X450S is a double-acting, double-rod pneumatic cylinder delivering balanced bidirectional force, making it ideal for applications requiring a rear rod for tooling or stroke sensing. At 0.5 MPa, it provides 5734 N of thrust in both the extend and retract strokes, with the force rising to 10321 N at the maximum operating pressure of 0.9 MPa.
This model features a 125 mm bore with a 32 mm diameter rod passing through both end caps, ensuring identical push and pull forces. The 450 mm stroke is within the standard range for this ISO 6430 class cylinder. A built-in magnet is included, allowing direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for contactless position feedback.
| Model | Airtac SCD Standard Cylinder SCD125X450S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 450 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. |
| ×450 | 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 the rear rod extension make this cylinder perfect for shuttling parts between two parallel conveyor lines, where a stop block or secondary tool can be mounted on the back end.
With a 32 mm through-rod providing inherent anti-rotation, this cylinder is suited for clamping fixtures or light press operations where maintaining tool alignment is critical without adding an external guide.
The built-in magnet (-S) and the exposed rear rod allow a CMSG/DMSG sensor to be mounted on the barrel to detect stroke end, while a separate flag on the rear rod can trigger an external sensor for mid-stroke confirmation.
Select the SCD125X450S when you need a robust, high-force double-rod actuator with integrated magnetic sensing. For applications requiring slightly less force, stepping down to the SCD100 bore reduces the output to 3681 N at 0.5 MPa, while the SCD160 bore offers a significant jump to 9425 N. The double-rod design is optimal for symmetric loading and anti-rotation, but for heavy side loads, a dedicated guided cylinder is a safer choice than relying solely on the through-rod's improved guidance.
For a direct replacement, match the 125 mm bore, 450 mm stroke, PT port thread, and the built-in magnet (-S suffix). This model uses the basic mounting configuration, so ensure any existing foot (LB) or front flange (FA) accessories are transferred or ordered separately. For strokes of 300 mm or more, always assess the risk of rod bending under compressive load and consider an external guide rail to protect the cylinder.
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 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 a rear rod extension to mount a tool, stopper, or sensor flag, or when you require perfectly equal speed and force in both directions. The dual-rod support also provides better side-load resistance and anti-rotation than a single-rod SC cylinder, though it is not a substitute for a fully guided actuator under high side loads.
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