The AirTAC Airtac SCD Standard Cylinder SCD80X4 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. Ø80mm bore, 4mm stroke, PT3/8 ports and adjustable end cushioning.
The SCD80X4 is an 80 mm bore double-rod pneumatic cylinder with a short 4 mm stroke, delivering balanced 2268 N thrust in both directions at 0.5 MPa. Its 25 mm diameter rod extends from both end caps, giving identical push and pull force and allowing tooling or a sensor flag to be mounted on the rear rod. The tie-rod construction and dual-rod bearing support provide better guidance than a single-rod cylinder in compact, repetitive positioning tasks.
With a body length A(SCD) of 257 mm and an adjustable air cushion of 28 mm at each end, this cylinder decelerates the piston smoothly even in high-cycle short-stroke applications. It operates on filtered air from 0.15 to 1.0 MPa and suits speeds of 30-800 mm/s. The default configuration uses PT ports and a TPU seal for standard -20 to +70 °C environments.
| Model | Airtac SCD Standard Cylinder SCD80X4 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø80 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 4 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT3/8 |
| 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, 28 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 | 2268 N | 2268 N |
| 0.7 MPa | 3175 N | 3175 N |
| Max (@1.0 MPa) | 463 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). |
|---|---|
| 80 | Bore size in mm. |
| ×4 | 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 4 mm stroke and identical push/pull force make it ideal for two-sided clamping fixtures where both jaws must close with the same pressure.
Used as a compact ejector pin actuator, the through-rod allows a return spring or sensor target to be placed on the rear rod for precise part ejection.
The double-rod design prevents piston rotation, making it suitable for applications where a non-rotating short linear movement is required at both ends.
Choose the SCD80X4 when you need a short, equal-force stroke from both ends of the cylinder, such as in clamping or ejector mechanisms. If 2268 N at 0.5 MPa is more force than required, stepping down to the 63 mm bore (SCD63) reduces force to 1402 N at the same pressure. For longer strokes where side load on the exposed rear rod becomes a concern, consider an external guide or a dedicated guided cylinder instead of a double-rod unit. To replace an existing SCD80X4, match the 80 mm bore, 4 mm stroke, PT port thread, basic mounting, and absence of a magnet.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull force is identical. At 0.5 MPa it delivers 2268 N, at 0.7 MPa it delivers 3175 N, and at the maximum operating pressure of 0.9 MPa it reaches 4082 N.
You pick the SCD when you need equal force and speed in both directions, a rear rod end for mounting tooling or sensors, and better inherent rod guidance. The trade-off is a longer overall retracted length because the rod protrudes from both ends.
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