The AirTAC Airtac SCD Standard Cylinder SCD50X80S 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, 80mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X80S is a double-acting, double-rod pneumatic cylinder that delivers identical force in both directions—825 N at 0.5 MPa—thanks to its 20 mm through-rod subtracting the same area on each side. This balanced output makes it a natural fit for tasks needing symmetric motion, such as operating a two-sided tool or driving a transfer shuttle where the rear rod can carry a sensor flag.
At 80 mm stroke, this model stays well within the 1200 mm maximum standard stroke for the 50 mm bore. The built-in magnet (denoted by the -S suffix) allows easy mounting of CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for non-contact position sensing, while the PT1/4 ports and adjustable air cushion at each end provide smooth deceleration over the final 21 mm of travel.
| Model | Airtac SCD Standard Cylinder SCD50X80S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 80 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. |
| ×80 | 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 825 N at 0.5 MPa ensures a balanced, consistent motion profile for shuttling parts between two stations, with the rear rod available to mount a counterbalance or secondary sensor flag.
Power a pressing or staking tool from one end while using the rear rod extension to trigger a limit switch, confirming cycle completion without needing a separate external actuator.
The dual-rod support provides inherent anti-rotation stability for simple push/pull applications, making it suitable for aligning components where preventing piston twist is critical.
This 50 mm bore SCD is the middle ground in the double-rod range, offering 825 N of force at 0.5 MPa. If your application requires less force, stepping down to the 40 mm bore provides 528 N, while moving up to the 63 mm bore delivers a substantial jump to 1402 N at the same pressure. For applications where only one end of the cylinder needs to do work, a single-rod SC series cylinder is a more economical choice.
To replace an existing SCD50X80S, match the 50 mm bore, 80 mm stroke, PT port thread, and the integrated magnet for sensor compatibility. Since this is a basic mount model, any existing foot (LB) or flange (FA) brackets can be transferred. Remember that the through-rod improves guidance but does not eliminate side-load capacity; for any stroke over 300 mm or with significant lateral force, an external guide rail or a guided cylinder is essential to prevent rod bending.
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 20 mm rod area from the 50 mm bore area. This results in 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need equal force and speed in both directions, or when you need to mount a tool, stopper, or sensor on the rear rod. The through-rod design also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a replacement for a fully guided cylinder under heavy side loads.
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