Airtac SCD Standard Cylinder SCD125X400
The AirTAC Airtac SCD Standard Cylinder SCD125X400 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 400mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke400 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X400
The SCD125X400 is a double-acting, double-rod pneumatic cylinder that outputs an identical 5734 N of force in both the extend and retract strokes when supplied with 0.5 MPa air. Its 32 mm diameter rod passes through both end caps, giving you a rear rod extension for mounting a limit switch flag, a secondary tool, or a manual stopper, all while ensuring perfectly balanced thrust for a 400 mm linear movement.
This ISO 6430 class tie-rod cylinder uses a PT1/2 port and an M27x2 rod thread, with an adjustable air cushion of 28 mm at each end to decelerate the piston smoothly. The retracted body length A(SCD) is 291 mm, and the through-rod design provides superior bearing support compared to a single-rod cylinder, helping to resist deflection in symmetric push-pull applications.
Airtac SCD Standard Cylinder SCD125X400 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 400 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 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.
Theoretical Output Force (Ø125mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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.
Model Code: Airtac SCD Standard Cylinder SCD125X400
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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.
Where the Airtac SCD Standard Cylinder SCD125X400 Is Used
Dual-Sided Transfer Shuttles
The equal push/pull force and rear rod make it ideal for a shuttle table where a workpiece is pushed from one station and the return stroke pulls a second fixture into place, using both rod ends for actuation.
Symmetric Clamping & Forming
Use the front and rear rods to close two opposing clamps or forming dies simultaneously. The balanced 10321 N force at 0.9 MPa ensures uniform pressure is applied from both sides without a complex linkage.
Anti-Rotation Pusher with Rear Flag
The through-rod provides inherent anti-rotation stability. Mount a sensor flag on the rear M27x2 rod end to detect piston position externally, keeping the front work area clear for a pusher or ejector tool.
Is the Airtac SCD Standard Cylinder SCD125X400 the Right Cylinder?
Choose the SCD125X400 when your mechanism needs equal, bidirectional force and a rear rod for dual-sided work. If 5734 N at 0.5 MPa is more than required, stepping down to the SCD100 bore provides 3681 N; if you need more muscle, the SCD160 delivers 9425 N at the same pressure. For a purely one-sided push task, a single-rod SC125 cylinder would be a simpler and more cost-effective choice.
At a 400 mm stroke, ensure the long, unsupported rod sections are not subjected to significant side loads. If lateral forces are present, an external guide rail or a dedicated guided cylinder is required to prevent rod bending and premature seal wear. This model is a direct replacement for an existing AirTAC SCD125X400 unit, matching bore, stroke, PT port thread, basic mounting, and the standard TPU seal.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCD Standard Cylinder SCD125X400 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 5734 N, at 0.7 MPa it produces 8028 N, and at the maximum operating pressure of 0.9 MPa it produces 10321 N. The theoretical force at 1.0 MPa is 1169 kgf.
Select the SCD125X400 when you need a rear rod extension for mounting tooling, a sensor flag, or a manual stop, or when your application requires perfectly equal force and speed in both directions. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder. If you only need to push in one direction and don't need the rear rod, the single-rod SC125 is the more economical choice.
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