The AirTAC Airtac SCD Standard Cylinder SCD63X550S 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, 550mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X550S delivers identical force in both directions, producing 1402 N of push and pull at 0.5 MPa thanks to its through-rod design that subtracts the same rod area from each chamber. With a 20 mm rod extending from both end caps and a 550 mm stroke, this cylinder is built for applications that need a rear rod end for mounting a sensor flag, stopper bolt, or secondary tooling.
A 28 mm adjustable air cushion at each end decelerates the piston smoothly, while the built-in magnet (denoted by the -S suffix) lets you clip CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the tie-rod barrel for non-contact position sensing. The body length A(SCD) is 210 mm, and the cylinder operates on 40 µm filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCD Standard Cylinder SCD63X550S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 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, 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. |
| ×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 rod extending from both ends allows you to mount tooling on the front and a stopper or secondary mechanism on the rear, performing work in both stroke directions simultaneously.
The -S magnet and exposed rear rod make it simple to attach a sensor flag for end-of-stroke detection, keeping the front tooling area clear and the sensor electronics protected.
The dual-rod support provides better resistance to rod rotation than a single-rod cylinder, helping maintain alignment when pushing parts onto a conveyor or into a fixture without adding an external guide.
This 63 mm bore double-rod cylinder outputs 1402 N at 0.5 MPa. If your load requires more force, stepping up to the 80 mm bore SCD80 series provides 2268 N at the same pressure. For a single-direction push application where a rear rod is unnecessary, the standard SC63 single-rod cylinder is a lighter, more compact alternative. At a 550 mm stroke, ensure the long unsupported rod is not subjected to significant side loads; if lateral forces are present, pair the cylinder with an external linear guide or switch to a guided cylinder. For a direct replacement, match the 63 mm bore, 550 mm stroke, PT port thread, basic mounting, and the -S magnet option.
Double-rod checklist
Because the piston rod passes through both ends of the cylinder, the effective pressure area is identical for push and pull. The force is 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 require a rear rod extension to mount a limit switch flag, a mechanical stop, or secondary tooling. The through-rod also provides improved bearing support against rod deflection compared to a single-rod SC, but it is not a replacement for a fully guided cylinder under heavy side loads.
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