The AirTAC Airtac SCD Standard Cylinder SCD80X550 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, 550mm stroke, PT3/8 ports and adjustable end cushioning.
The SCD80X550 is an 80 mm bore, 550 mm stroke double-rod pneumatic cylinder where the piston rod extends from both ends, providing identical push and pull force of 2268 N at 0.5 MPa. Its through-rod design subtracts the Ø25 mm rod area from both sides, making it ideal for applications needing balanced, reciprocal motion or a rear rod for mounting sensors and strikers.
With a 28 mm air cushion on each end and a body length A of 257 mm, this cylinder decelerates loads smoothly without metal-to-metal contact. Operating on filtered air from 0.15 to 1.0 MPa, it reaches 4082 N of thrust at 0.9 MPa, offering a robust, self-guided solution for transfer mechanisms that require consistent speed in both directions.
| Model | Airtac SCD Standard Cylinder SCD80X550 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø80 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 550 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. |
| ×550 | 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 force and speed in both directions make the SCD80X550 perfect for shuttle tables that move a fixture between two stations, ensuring consistent cycle times.
The rear rod extension provides a clean, accessible surface to mount a sensor flag or cam for end-of-stroke detection without interfering with the main tooling on the front.
Used in a dual-pusher setup where one rod pushes a part into position while the rear rod simultaneously actuates a lock or ejector, leveraging the balanced force output.
Select the SCD80X550 when your mechanism demands equal force and speed extending and retracting, and the 2268 N output at 0.5 MPa fits your load. If you need more force, step up to the SCD100 bore, which provides 3681 N at the same pressure. For a purely single-direction push task, a single-rod SC80 cylinder would be lighter and more compact. At this 550 mm stroke, ensure the long unsupported rod is not subjected to high side loads; if lateral forces are present, add an external linear guide or switch to a guided cylinder.
For direct replacement, match the 80 mm bore, 550 mm stroke, PT port thread, basic mounting, and the absence of a magnet. This ensures drop-in compatibility with an existing AirTAC SCD double-rod unit.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 2268 N, at 0.7 MPa it is 3175 N, and at the maximum operating pressure of 0.9 MPa it reaches 4082 N in both directions.
Choose an SCD when you need perfectly balanced force and speed in both directions, or require the rear rod end for mounting accessories like sensors or a mechanical stop. The through-rod also provides better support for the piston, reducing uneven bearing wear compared to a single-rod cylinder under the same conditions.
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