The AirTAC Airtac SCD Standard Cylinder SCD63X125H 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.
The SCD63X125H is a double-acting, double-rod pneumatic cylinder fitted with high-temperature Viton (FKM) seals, rated for service from 0 to +150 °C. Its through-rod design delivers identical push and pull thrust—1402 N at 0.5 MPa and up to 2523 N at the maximum operating pressure of 0.9 MPa—making motion perfectly symmetrical in both directions.
With a 20 mm diameter rod extending from both ends and a 28 mm adjustable air cushion, this 125 mm stroke cylinder is well-suited for hot-environment tooling where a rear rod extension can carry a sensor flag or secondary actuator. The body length A(SCD) is 210 mm, and the cylinder uses PT1/4 ports with an M16x1.5 rod thread.
| Model | Airtac SCD Standard Cylinder SCD63X125H |
|---|---|
| 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 FKM seals allow this cylinder to shuttle parts in ovens or near heated platens where standard polyurethane would degrade, with equal force in both stroke directions.
The rear rod provides a clean, accessible surface for mounting external position flags or a cam to trigger limit switches without interfering with the main tooling on the front rod.
Identical push and pull force of 1402 N at 0.5 MPa ensures a balanced clamping action, useful in assembly fixtures where the cylinder body is stationary and both rod ends actuate tooling.
Step up to the SCD80 bore if your application needs more than 2268 N of force at 0.5 MPa; step down to the SCD50 if 825 N is sufficient and a lighter, more compact unit is preferred. This SCD63X125H is a direct replacement for an existing AirTAC SCD double-rod unit only when the bore, 125 mm stroke, PT port thread, basic mounting style, and Viton seal material all match. If you need a single-rod cylinder, the SC series provides a different force profile.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 1402 N, at 0.7 MPa it outputs 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N.
Choose the SCD when you need equal force and speed in both directions, or when you need a rear rod extension to mount a sensor flag, stopper bolt, or secondary tooling. The through-rod also provides better guidance and resistance to side-load moments than a single-rod cylinder, though it is not a substitute for a fully guided actuator under heavy side loads.
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