The AirTAC Airtac SCD Standard Cylinder SCD100X400LB 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 SCD100X400LB is a double-acting, double-rod pneumatic cylinder that outputs an identical 3681 N of thrust in both directions at 0.5 MPa, rising to 6626 N at the maximum operating pressure of 0.9 MPa. This symmetry comes from the 25 mm piston rod passing through both end caps, subtracting the same area from each side of the piston. The 400 mm stroke is well within the 1500 mm maximum for the 100 mm bore, making it a standard, readily available configuration.
This model is configured with an LB foot mounting (F-SC100LB), which provides a stable, surface-mounted installation using axial feet on the barrel. The body length A(SCD) is 263 mm, and the adjustable air cushion at each end is 29 mm, giving you fine control over end-of-stroke deceleration. With PT1/2 ports and a default TPU seal for -20 to +70 C operation, it is built for balanced, two-sided tooling tasks.
| Model | Airtac SCD Standard Cylinder SCD100X400LB |
|---|---|
| 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 and pull force of 3681 N at 0.5 MPa makes this cylinder perfect for shuttle tables where a fixture must be moved with identical power in both directions, ensuring smooth, balanced motion.
With a through-rod providing superior guidance, the SCD100X400LB resists piston rotation better than a single-rod cylinder, making it suitable for pushing components without adding an external anti-rotation guide.
The exposed rear rod provides a convenient, clean mounting point for a sensor flag or external limit switch bracket, enabling end-of-stroke detection without interfering with the main tooling on the front rod.
Choose this 100 mm bore when your application needs around 3700 N of force in both directions at standard plant pressure. If you can accept a lower, but still symmetric, force of 2268 N, stepping down to the SCD80 bore reduces air consumption and physical size. For applications requiring a higher force of 5734 N at the same pressure, the SCD125 bore is the next step up. The double-rod design is ideal when you need to mount tooling, a cam, or a sensor flag on the rear rod, but it is not a substitute for a guided cylinder under significant side loads.
For a 400 mm stroke, be mindful of the unsupported rod length when fully extended. If the load is not perfectly axial, rod buckling or bearing wear can occur; consider adding an external guide rail or switching to a guided cylinder for off-center loads. As a direct replacement, this unit matches any SCD100X400 with an LB mount, PT ports, and no magnet. For a single-rod alternative, see the SC series.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. 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. The theoretical force at 1.0 MPa is 751 kgf.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you need to use the rear rod for mounting a secondary tool, a mechanical stop, or a sensor flag. The through-rod also provides better support for the piston, reducing side-loading on the bearing, though it is not a full guided solution.
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