The AirTAC Airtac SCD Standard Cylinder SCD40X40 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 40mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X40 is a compact double-rod pneumatic cylinder that outputs an identical 528 N of force in both directions at 0.5 MPa, thanks to its through-rod design where the 16 mm rod occupies both pressure chambers equally. With a short 40 mm stroke and a body length A(SCD) of 191 mm, it fits neatly into tight spaces where a back-and-forth motion must be absolutely symmetric.
Both ends of the cylinder feature an M12x1.25 male rod thread, allowing you to mount tooling, stripper plates, or sensor flags on the rear rod. The adjustable air cushion on each end, with a 21 mm cushion length, decelerates the piston smoothly, making this genuine AirTAC actuator suitable for light, high-cycle pick-and-place tasks that demand balanced push-pull performance.
| Model | Airtac SCD Standard Cylinder SCD40X40 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 40 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 528 N force in both directions makes the SCD40X40 ideal for two-sided clamping fixtures where uneven pressure could distort a workpiece.
The rear rod extension provides a convenient mounting point for a sensor flag or cam, enabling end-of-stroke detection without interfering with the primary tooling on the front rod.
Use the through-rod to drive a shuttle plate back and forth with perfectly matched speed and force, ensuring smooth part transfer between two stations.
Choose the SCD40X40 when your application requires equal force in both directions from a 40 mm bore. If you need more thrust, stepping up to the SCD50 bore provides 825 N at 0.5 MPa. If your task only requires force in one direction, a single-rod SC40 cylinder offers a higher push force of 628 N at the same pressure because the full bore area is available on the push stroke. For a direct replacement, match the 40 mm bore, 40 mm stroke, PT port thread, basic mounting, and absence of a magnet.
Double-rod checklist
Because the SCD is a double-rod cylinder, the effective piston area is the same on both sides. The SCD40X40 produces 528 N of force in both the push and pull directions at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD40X40 when you need identical force and speed in both directions, or when you need a rear rod extension to mount secondary tooling, a stopper bolt, or a sensor target. The double-rod design also provides better guidance for the piston, reducing uneven wear on the rod bearing compared to a single-rod cylinder under minor side loads.
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