The AirTAC Airtac SCD Standard Cylinder SCD50X300 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X300 is a double-acting, double-rod pneumatic cylinder that delivers identical force in both directions—825 N at 0.5 MPa—because the 20 mm rod passes through both end caps. This symmetry makes it ideal for applications needing a rear rod for tooling, stroke sensing, or a manual stop, while the 300 mm stroke handles longer transfer and shuttle tasks.
With a body length A(SCD) of 207 mm and an adjustable air cushion of 21 mm at each end, this tie-rod cylinder decelerates the piston smoothly without external shock absorbers. Its PT1/4 ports and M16x1.5 rod threads are standard across the 50 mm bore family, and the twin-rod design provides better guidance than a single-rod cylinder under light side loads.
| Model | Airtac SCD Standard Cylinder SCD50X300 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 300 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. |
| ×300 | 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 lets you mount a tooling plate on the front and a counterbalance or second fixture on the rear, moving a part between two stations with equal speed and force in each direction.
With a rod on both ends, the piston is better supported against twisting. Use the SCD50X300 as a long-stroke pusher where a single-rod cylinder would need an external anti-rotation guide.
Attach a sensor flag or cam to the rear rod extension to trigger limit switches or CMSG magnetic sensors, keeping the front tooling area clear for the working load.
Choose the SCD50X300 when you need equal push-pull force and a through-rod for dual-sided actuation. If 825 N at 0.5 MPa is marginal, step up to the 63 mm bore (SCD63 series) which provides 1402 N; if the stroke is too long and rod buckling is a concern, consider an external guide rail or a guided cylinder. For a single-rod version of this bore, the SC50 series is the correct alternative.
For a drop-in replacement, match bore (50 mm), stroke (300 mm), port thread (PT), and mounting accessory. This basic model has no magnet or bracket; if you need piston position sensing, order the -S magnet variant and add CMSG/DMSG sensors. At 300 mm stroke, ensure the unsupported rear rod extension does not see side load—use a rod guide or align the tooling carefully.
Double-rod checklist
Push and pull force are identical because the rod extends from both ends. At 0.5 MPa you get 825 N, at 0.7 MPa it is 1154 N, and at the maximum operating pressure of 0.9 MPa it reaches 1484 N. The theoretical force at 1.0 MPa is 168 kgf.
Pick the SCD when you need equal force and speed in both directions, a rear rod extension to mount a sensor flag or secondary tool, or better inherent rod guidance to resist rotation. The single-rod SC is lighter and shorter, but its pull force is lower than its push force due to the rod area on only one side.
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