The AirTAC Airtac SCD Standard Cylinder SCD50X550 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, 550mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X550 double-rod pneumatic cylinder provides a balanced 825 N of thrust in both extend and retract strokes at 0.5 MPa, thanks to its through-rod design that equalizes the effective piston area on each side. With a 20 mm diameter rod protruding from both end caps, this 50 mm bore unit is built for applications that demand identical force and speed in two directions, such as operating tooling on both ends or driving a shuttle table with a rear-mounted sensor flag.
This 550 mm stroke model stays within the 1200 mm maximum standard stroke for the 50 mm bore, and its tie-rod construction houses an adjustable air cushion (21 mm length) at each end to decelerate the piston smoothly. The body length A(SCD) is 207 mm, making the overall retracted length longer than a comparable single-rod SC cylinder, and the PT1/4 ports supply air filtered to 40 µm for reliable, long-term cycling.
| Model | Airtac SCD Standard Cylinder SCD50X550 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 550 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. |
| ×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 through-rod design allows tooling or a workpiece nest to be mounted on both ends, enabling a single cylinder to shuttle parts between two stations with perfectly synchronized motion.
The rear rod extension provides a clean, accessible surface for mounting a sensor flag or cam, allowing end-of-stroke detection without interfering with the primary tooling on the front rod.
With dual rod support at both end caps, the SCD50X550 offers improved resistance to rod rotation compared to a single-rod cylinder, making it suitable for pushing applications where maintaining orientation is critical.
Choose the SCD50 when you need the symmetric 825 N force at 0.5 MPa and a 20 mm through-rod for dual-sided tasks. If your load requires more thrust, stepping up to the SCD63 bore delivers 1402 N at the same pressure, while dropping to the SCD40 provides 528 N for lighter, more compact assemblies. This double-rod unit is ideal when you need a rear rod extension for mounting a cam, stopper, or external sensor; however, if you only need force from one end, the single-rod SC50X550 is a simpler, more cost-effective choice.
For a stroke of 550 mm, be mindful of the long, unsupported rod extending from the rear. Side loads or high-speed cycling can cause rod deflection or bearing wear; if the application imposes any lateral force, pair the cylinder with an external linear guide or switch to a guided cylinder. To replace an existing SCD50X550, match the 50 mm bore, 550 mm stroke, PT port thread, basic mounting, and confirm if a magnet (-S) or alternative seal is needed.
Double-rod checklist
Because the SCD is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 825 N, at 0.7 MPa it delivers 1154 N, and at the maximum operating pressure of 0.9 MPa the force reaches 1484 N in both directions.
Choose the SCD50 when your application benefits from having a piston rod on both ends. This provides equal force and speed in both directions, allows you to mount tooling or sensors on the rear rod, and offers better guidance and anti-rotation stability for the piston assembly compared to a single-rod cylinder.
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