Airtac SCD Standard Cylinder SCD250X50
The AirTAC Airtac SCD Standard Cylinder SCD250X50 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, 50mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke50 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X50
The SCD250X50 is a heavy-duty double-rod pneumatic cylinder that delivers exactly 23562 N of thrust in both directions at 0.5 MPa, thanks to its symmetric piston area. With a 250 mm bore and a 50 mm rod extending from both ends, it provides a rigid, anti-rotation platform for tooling mounted on either side of the piston.
This model features a short 50 mm stroke within a body length A(SCD) of 435 mm, and uses a 1-inch PT port for high flow. The adjustable air cushion on each end is 40 mm long, effectively decelerating the large mass without metal-to-metal impact. Its tie-rod construction and dual-rod support make it a robust choice for symmetrical pressing or clamping tasks.
Airtac SCD Standard Cylinder SCD250X50 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X50 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 50 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 SCD250X50
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×50 | 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 SCD250X50 Is Used
Symmetrical Pressing
Uses the equal 23562 N push and pull force at 0.5 MPa for two-sided pressing, stamping, or clamping operations where the work is accessed from both ends.
Dual-Side Tooling Platform
The 50 mm through-rod allows mounting of tooling, stripper plates, or sensor flags on the rear end, synchronizing motion with the front without complex linkages.
Heavy Shuttle Transfer
Ideal for shifting heavy pallets or components on a transfer line, where the rear rod can be used to actuate a secondary mechanism or provide a balanced guidance point.
Is the Airtac SCD Standard Cylinder SCD250X50 the Right Cylinder?
Choose the SCD250X50 when your application requires balanced, high-force actuation from both ends of the cylinder. If 23562 N at 0.5 MPa is more force than needed, stepping down to the 200 mm bore SCD200 series reduces the force to 15080 N at the same pressure. For applications needing only a single working end, the single-rod SC250 series is a more compact and cost-effective alternative.
This double-rod design is not a substitute for a fully guided cylinder under significant side loads; for those conditions, add an external guide rail. To replace an existing unit, match the 250 mm bore, 50 mm stroke, PT port thread, and the specific SCD mounting accessory. Note that the through-rod provides better bearing support than a single-rod cylinder, but the unsupported rod ends should not be subjected to bending moments.
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 SCD250X50 FAQ
The push and pull forces are identical in a double-rod cylinder. For the 250 mm bore with a 50 mm rod, the force is 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and 42412 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you require a rear rod extension to mount cams, sensors, or additional tooling. The through-rod also provides better support and inherent anti-rotation compared to a single-rod cylinder, though it is not a replacement for a fully guided actuator under high side loads.
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