The AirTAC Airtac SCD Standard Cylinder SCD100X400 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø25mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø100mm bore, 400mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD100X400 is a double-acting pneumatic cylinder with a continuous piston rod extending from both ends, providing identical 3681 N output in push and pull at 0.5 MPa. This symmetry is ideal for applications requiring balanced force and speed in both directions, such as transfer shuttles or dual-sided tooling. The 25 mm diameter rod runs through the full 400 mm stroke, offering inherent anti-rotation and better bearing support than a single-rod cylinder.
With a 100 mm bore and a 400 mm stroke, this model operates within the standard stroke range for its size. The adjustable air cushion at each end, with a 29 mm cushion length, decelerates the piston smoothly, reducing end-of-stroke impact. The body length A(SCD) is 263 mm, and the overall retracted length is longer than the equivalent single-rod SC model due to the rod protruding from the rear cap. It uses a PT1/2 port and generates up to 6626 N of thrust at the maximum operating pressure of 0.9 MPa.
| Model | Airtac SCD Standard Cylinder SCD100X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø100 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 400 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 29 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 | 3682 N | 3682 N |
| 0.7 MPa | 5154 N | 5154 N |
| Max (@1.0 MPa) | 751 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). |
|---|---|
| 100 | Bore size in mm. |
| ×400 | 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 of 3681 N at 0.5 MPa makes the SCD100 ideal for linear transfer units where a pallet or workpiece is moved between two stations with identical power in each direction.
The rear rod extension provides a perfect mounting point for a sensor flag or cam, allowing end-of-stroke detection without interfering with the primary tooling on the front rod.
The dual-rod design offers inherent anti-rotation, making the SCD100X400 suitable for pushing or ejecting parts where maintaining a fixed tool orientation is critical without adding an external guide.
Choose the SCD100X400 when you need equal, bidirectional force and a rear rod end for mounting a sensor flag, stopper, or secondary tooling. If your load requires only a push stroke, the single-rod SC100 series provides a higher push force (4118 N at 0.5 MPa) by using the full piston area and is a more economical choice. For applications with significant side loads on this 400 mm stroke, an external guide rail or a dedicated guided cylinder is necessary, as the dual-rod design improves guidance but does not eliminate the risk of rod bending under heavy radial forces.
To replace an existing SCD100X400, match the 100 mm bore, 400 mm stroke, PT1/2 port thread, basic mounting style, and the absence of a magnet. If you are stepping up from an SCD80, this 100 mm bore provides a substantial force increase from 2268 N to 3681 N at 0.5 MPa. For a lower force requirement, the SCD80X400 delivers 2268 N.
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 25 mm rod area from the 100 mm bore area. The force is 3681 N at 0.5 MPa, 5153 N at 0.7 MPa, and 6626 N at the maximum operating pressure of 0.9 MPa.
Select the SCD when you require equal force and speed in both directions, or when you need to utilize the rear rod for mounting sensors, cams, or secondary tooling. The through-rod also provides better guidance and anti-rotation than a single-rod SC. Choose the SC if you only need a single-direction push force, as it provides a higher force output for the same bore size by using the full piston area.
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