The AirTAC Airtac SCD Standard Cylinder SCD50X20S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 20mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X20S is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions—825 N at 0.5 MPa—because the 20 mm rod extends through both end caps. This short 20 mm stroke variant, equipped with a built-in magnet, is ideal for compact two-sided actuation where you need to confirm end-of-stroke position with a barrel-mounted sensor.
With a body length A(SCD) of 207 mm and an adjustable air cushion of 21 mm, it decelerates the piston smoothly at both ends of travel. The PT1/4 port and M16x1.5 rod thread connect easily into standard pneumatic circuits, and the through-rod design provides better bearing support than a single-rod cylinder of the same size.
| Model | Airtac SCD Standard Cylinder SCD50X20S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 20 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 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 | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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). |
|---|---|
| 50 | Bore size in mm. |
| ×20 | 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 rod extending from both ends allows a single cylinder to push a component into a fixture while simultaneously retracting a stop pin on the opposite side, synchronizing two actions with one compact actuator.
The built-in magnet (-S) lets you mount reed or solid-state sensors on the barrel to verify the 20 mm stroke is fully completed, critical for high-speed pick-and-place nests where a missed cycle causes a jam.
The through-rod provides dual bearing support, making this cylinder suitable for light alignment or pressing tasks where the rod must resist twisting better than a single-rod design.
Choose the SCD50X20S when you need balanced push-pull force in a compact stroke. If 825 N at 0.5 MPa is insufficient, stepping up to the SCD63 bore delivers 1402 N. For applications where only one rod end is needed, the single-rod SC50 series is a simpler, more economical choice. This model carries the -S magnet suffix, so it is ready for CMSG/DMSG/EMSG sensors to be clamped directly onto the tie-rod barrel.
For a direct replacement, match the 50 mm bore, 20 mm stroke, PT port thread, basic mounting, and the built-in magnet option. A genuine AirTAC SCD50X20S is the only guaranteed drop-in substitute.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it delivers 825 N, at 0.7 MPa it delivers 1154 N, and at the maximum operating pressure of 0.9 MPa it delivers 1484 N in both directions.
Choose an SCD when you need identical force and speed in both directions, or when you need a rear rod extension to mount a sensor flag, a mechanical stop, or secondary tooling. The through-rod also provides better guidance and anti-rotation support than a single-rod cylinder.
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