Airtac SCD Standard Cylinder SCD250X25S
The AirTAC Airtac SCD Standard Cylinder SCD250X25S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø50mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø250mm bore, 25mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke25 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X25S
The SCD250X25S is a heavy-duty double-rod pneumatic cylinder delivering identical push and pull force of 23562 N at 0.5 MPa, thanks to its through-rod design that subtracts the Ø50 mm rod area from both sides. This short 25 mm stroke model is built for applications needing massive, symmetric thrust in a compact axial envelope, such as clamping or pressing.
With a body length A(SCD) of 435 mm and a 40 mm adjustable air cushion, it decelerates high-inertia loads smoothly at both ends. The integrated magnet allows direct mounting of CMSG/DMSG/EMSG sensors for end-of-stroke detection without external brackets, simplifying setup on large-scale tooling.
Airtac SCD Standard Cylinder SCD250X25S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X25S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 25 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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, 40 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 (Ø250mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 23562 N | 23562 N |
| 0.7 MPa | 32987 N | 32987 N |
| Max (@1.0 MPa) | 4805 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 SCD250X25S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | 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 SCD250X25S Is Used
Heavy-Duty Symmetric Clamping
The equal 23.6 kN force in both directions makes this cylinder ideal for large weld fixtures where the clamp must apply and release with identical power, preventing part distortion.
Dual-Sided Press Operations
Use the rear rod to drive a secondary tool or ejector plate in a stamping press, synchronizing two actions from one cylinder body with perfectly matched timing and force.
Integrated Stroke Sensing on Large Bores
The built-in magnet (-S) lets you clip CMSG reed switches directly onto the 250 mm bore barrel, providing reliable position feedback for automated heavy-machinery sequences.
Is the Airtac SCD Standard Cylinder SCD250X25S the Right Cylinder?
Select the SCD250 when your application demands over 23000 N of force in both directions—stepping down to the SCD200 bore reduces force to 15080 N at the same 0.5 MPa. This double-rod unit is the right choice when you need a rear rod extension for a stopper or sensor flag, but if the load applies significant side force, pair it with an external guide rail rather than relying on the through-rod alone. For a direct replacement, match the 250 mm bore, 25 mm stroke, PT port thread, basic mount, and the -S magnet option 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 SCD250X25S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 23562 N, at 0.7 MPa it delivers 32987 N, and at the maximum operating pressure of 0.9 MPa it reaches 42412 N.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you require a rear rod extension to mount a sensor flag, mechanical stop, or secondary tooling. The through-rod also provides better bearing support than a single-rod cylinder, though it is not a substitute for an external guide under high side loads.
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