The AirTAC Airtac SCD Standard Cylinder SCD63X25S 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, 25mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X25S is a double-acting, double-rod pneumatic cylinder delivering identical force in both directions—1402 N at 0.5 MPa, rising to 2523 N at 0.9 MPa. Its short 25 mm stroke and through-rod design make it ideal for compact, two-sided tasks like clamping, ejecting, or operating a rear limit switch, where space is tight but equal bidirectional thrust is non-negotiable.
A 20 mm diameter rod protrudes from both end caps, subtracting the same area from each chamber and naturally resisting rotation better than a single-rod cylinder. The built-in magnet (denoted by the -S suffix) lets you mount CMSG, DMSG, or EMSG sensors directly onto the 210 mm tie-rod body for precise, non-contact end-of-stroke detection without extra brackets.
| Model | Airtac SCD Standard Cylinder SCD63X25S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 25 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. |
| ×25 | 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 25 mm stroke with equal push/pull force powers synchronized clamps on both sides of a fixture, gripping parts from opposite directions without a complex linkage.
The protruding rear rod acts as a direct flag for a CMSG sensor mounted on the barrel, confirming retraction in tight automation cells where the front end is inaccessible.
Delivers a short, sharp 2523 N punch at 0.9 MPa from either end to eject parts from a die or nest, with the through-rod preventing piston rotation.
This 63 mm bore model suits applications needing about 1400 N of force each way at standard plant pressure. If your load is lighter, stepping down to the 50 mm bore (825 N at 0.5 MPa) can reduce air consumption and footprint. For heavier work, the 80 mm bore provides 2268 N. Remember that an SCD double-rod cylinder is not a guided unit; if the 25 mm stroke involves any side load, add an external guide rail.
To replace an existing SCD63X25S, match the 63 mm bore, 25 mm stroke, PT port thread, basic mounting, and the -S magnet option. A standard single-rod SC cylinder cannot substitute here if you need the rear rod extension for tooling or a sensor flag.
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 is 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N.
Choose an SCD when you need a rear rod extension to mount tooling, a stopper bolt, or a sensor flag. It also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a replacement for a fully guided cylinder under side load.
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