Airtac SCD Standard Cylinder SCD125X25
The AirTAC Airtac SCD Standard Cylinder SCD125X25 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, 25mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke25 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X25
The SCD125X25 provides a symmetrical 5734 N of force in both directions at 0.5 MPa, thanks to its double-rod design where the 32 mm rod passes through both end caps. This equal push-pull output makes it ideal for short-stroke, two-sided tooling or transfer tasks where the rear rod extension can carry a sensor flag or stopper.
With a 25 mm stroke and a body length A(SCD) of 291 mm, this ISO 6430 class cylinder includes an adjustable air cushion of 28 mm at each end to decelerate the piston smoothly. The PT1/2 ports and M27x2 rod threads are standard, and the maximum operating pressure is 1.0 MPa, where the force reaches 10321 N.
Airtac SCD Standard Cylinder SCD125X25 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X25 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 25 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 SCD125X25
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | 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.
Where the Airtac SCD Standard Cylinder SCD125X25 Is Used
Two-Sided Actuation
The through-rod provides identical force and speed in both directions, perfect for driving tooling that must perform work on both the extend and retract strokes without performance imbalance.
Rear-Mounted Stroke Sensing
The rear rod extension offers a convenient mounting point for a sensor flag or cam, enabling end-of-stroke detection on the cap-end side without adding brackets to the cylinder body.
Anti-Rotation Fixtures
With a rod supported by bearings in both end caps, the SCD125X25 provides better resistance to rod rotation than a single-rod cylinder, useful for maintaining alignment in short-stroke clamping.
Is the Airtac SCD Standard Cylinder SCD125X25 the Right Cylinder?
Step up to the SCD160 bore if your application needs more than the 5734 N (at 0.5 MPa) this 125 bore provides, which delivers 9425 N at the same pressure. If you only require force from one end, a single-rod SC125 cylinder offers a higher push force because the full bore area is available on the push stroke. For a direct replacement, match the 125 mm bore, 25 mm stroke, PT port thread, and basic mounting style exactly.
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 SCD125X25 FAQ
The push and pull forces are identical. At 0.5 MPa you get 5734 N, at 0.7 MPa it is 8028 N, and at the maximum operating pressure of 0.9 MPa the force reaches 10321 N in both directions.
Choose an SCD when you need equal force and speed on both strokes, or when you need to mount tooling, a sensor, or a mechanical stop on the rear rod. The dual-bearing support also improves guidance and reduces rod deflection compared to a single-rod cylinder of the same bore.
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