The AirTAC Airtac SCD Standard Cylinder SCD63X350 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. Ø63mm bore, 350mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X350 is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, guaranteeing identical push and pull force in both directions. At 0.5 MPa, this model outputs 1402 N each way, rising to 2523 N at the maximum operating pressure of 0.9 MPa, making it a balanced workhorse for symmetrical motion tasks.
With a 20 mm diameter rod passing through both end caps and a 28 mm adjustable air cushion at each end, the cylinder decelerates loads smoothly without shock. Its 350 mm stroke operates well within the 1500 mm maximum standard stroke for the 63 mm bore, and the body length A(SCD) of 210 mm provides a compact foundation for the through-rod design.
| Model | Airtac SCD Standard Cylinder SCD63X350 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 350 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, 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 | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SCD63X350 perfect for shuttle tables that move a fixture or part between two stations, using the rear rod to trigger limit switches.
Apply identical clamping force from both ends of the cylinder. The through-rod can act as a pull-rod for a secondary clamp, ensuring even pressure distribution on a workpiece.
The dual-rod design inherently resists piston rotation better than a single rod. Mount a sensor flag on the clean rear rod end for precise mid-stroke position sensing without interfering with the main tooling.
This 63 mm bore unit provides 1402 N of force at 0.5 MPa. If your application needs more thrust, stepping up to the 80 mm bore (SCD80) raises the force to 2268 N at the same pressure. For lighter, faster cycles, the 50 mm bore (SCD50) delivers 825 N. The double-rod design is ideal when you need to mount tooling or a sensor flag on the rear rod, but if you only require force from one end, a single-rod SC63 series cylinder is a simpler, more cost-effective alternative.
For a stroke of 350 mm, be mindful of the long, unsupported rod. While the through-rod provides better bearing support than a single-rod cylinder, significant side loads can still cause rod bending or seal wear. For such applications, an external linear guide or a dedicated guided cylinder is the correct engineering choice. To replace an existing SCD63X350, match the 63 mm bore, 350 mm stroke, PT port thread, basic mounting, and the absence of a magnet.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. It produces 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and 2523 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 attach tooling, a stopper, or a sensor flag to the rear rod. The through-rod also provides better guidance and anti-rotation properties than a standard single-rod cylinder, though it is not a replacement for a fully guided actuator under heavy side loads.
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