The AirTAC Airtac SCD Standard Cylinder SCD200X400 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø40mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø200mm bore, 400mm stroke, PT3/4 ports and adjustable end cushioning.
The SCD200X400 is a heavy-duty double-rod pneumatic cylinder that produces an identical 15080 N of thrust in both directions at 0.5 MPa, thanks to its 40 mm rod passing through both end caps. This symmetric output eliminates force differentials, making it ideal for large fixtures where the rear rod extension can mount a counterbalance, limit switch dog, or secondary tooling plate.
With a 200 mm bore and a 400 mm stroke, the cylinder body length A(SCD) is 362 mm. It operates on filtered air from 0.15 to 1.0 MPa and uses an adjustable air cushion (33 mm length) to decelerate the massive piston assembly smoothly. At the maximum operating pressure of 0.9 MPa, the available thrust reaches 27143 N in each direction.
| Model | Airtac SCD Standard Cylinder SCD200X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø200 mm |
| Rod diameter | Ø40 mm (both ends) |
| Stroke | 400 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT3/4 |
| Rod thread | M36×2 |
| 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, 33 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 | 15080 N | 15080 N |
| 0.7 MPa | 21111 N | 21111 N |
| Max (@1.0 MPa) | 3075 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). |
|---|---|
| 200 | 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 force in both directions provides consistent acceleration and deceleration for heavy transfer shuttles, ensuring a smooth, predictable cycle time regardless of travel direction.
The rear rod can actuate a clamping arm on the opposite side of the machine frame, allowing one cylinder to operate two clamping points simultaneously with perfectly synchronized motion.
The 15080 N of force at 0.5 MPa, available on both strokes, is well-suited for pressing large-diameter pipes or structural beams against a fixed anvil, with the rear rod providing a visual stroke indicator.
This 200 mm bore unit sits between the 160 mm bore (9425 N at 0.5 MPa) and the 250 mm bore (23562 N at 0.5 MPa). If your application requires less force, stepping down to the SCD160 reduces air consumption and physical size. For applications needing even higher force, the SCD250 provides a significant jump in output. Because the 400 mm stroke extends a long, unsupported rod from both ends, you must evaluate side loading carefully; an external guide rail or a self-guided unit is recommended if the load is not perfectly axial.
When replacing an existing cylinder, match five points: 200 mm bore, 400 mm stroke, PT port thread, the specific SCD mounting accessory (such as the F-SC200TC trunnion kit), and the presence or absence of a magnet. This cylinder is a direct replacement for another AirTAC SCD200X400 with the same configuration.
Double-rod checklist
The push and pull forces are identical because the piston rod extends through both ends. The effective piston area is the same on both sides. At 0.5 MPa, the force is 15080 N; at 0.7 MPa, it is 21111 N; and at the maximum operating pressure of 0.9 MPa, it reaches 27143 N.
Choose the SCD when you need perfectly balanced force and speed in both directions, or when you need to mount a tool, sensor, or stop on the rear rod. The through-rod design also provides better support for the piston, reducing uneven bushing wear in applications with minor side loads compared to a single-rod cylinder of the same bore.
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