The AirTAC Airtac SCD Standard Cylinder SCD63X125S 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
This SCD63X125S double-rod air cylinder generates an identical 1402 N of thrust in both directions at 0.5 MPa, thanks to the 20 mm rod passing through both end caps. The 125 mm stroke is a standard length for the 63 mm bore, and the body length A(SCD) is 210 mm, making it a compact choice for symmetrical linear tasks.
Equipped with a built-in magnet (-S suffix), this unit accepts CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for reliable end-of-stroke detection. The adjustable air cushion at each end, with a 28 mm cushion length, decelerates the piston smoothly, protecting the end caps during high-cycle operation.
| Model | Airtac SCD Standard Cylinder SCD63X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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. |
| ×125 | 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 protruding from both ends allows a single cylinder to perform work in two locations simultaneously, such as operating a diverter gate while triggering a limit switch on the rear rod.
Delivers equal force and speed in both directions, making it perfect for a reciprocating shuttle table where the load mass is identical for the push and pull strokes.
The dual-rod support provides better resistance to rotation than a single-rod cylinder, useful for a simple pusher application where a keyed rod is not required but some twist prevention is beneficial.
Choose the 63 mm bore when your application needs around 1402 N of force at standard plant pressure. If you require more thrust, stepping up to the 80 mm bore provides 2268 N at the same 0.5 MPa. For applications needing less force, the 50 mm bore delivers 825 N. This double-rod design is ideal when you need to attach tooling or a sensor flag to the rear rod; if you only need a single working end, the standard SC single-rod cylinder is a more economical choice.
To replace an existing SCD63X125S, match the 63 mm bore, 125 mm stroke, PT port thread, and the integrated magnet. Note that this is a basic mount model, so no additional mounting brackets are included. For strokes of 125 mm, side-loading is typically minimal, but always ensure the load is guided externally if any off-axis force is present, as the double-rod's bushings are not designed to absorb significant bending moments.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it produces 1402 N, at 0.7 MPa it produces 1962 N, and at the maximum operating pressure of 0.9 MPa it produces 2523 N in both directions.
Choose the SCD when you need identical force and speed on the extend and retract strokes, or when you need a second rod end for mounting a sensor cam, a mechanical stop, or secondary tooling. The through-rod also provides better guidance and anti-rotation performance than a single-rod cylinder of the same bore.
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