Airtac SCD Standard Cylinder SCD250X250
The AirTAC Airtac SCD Standard Cylinder SCD250X250 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, 250mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke250 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X250
The SCD250X250 is a heavy-duty double-rod pneumatic cylinder that produces precisely 23562 N of force in both directions at 0.5 MPa, thanks to its symmetric piston design where the 50 mm rod passes through both end caps. This eliminates the thrust imbalance common in single-rod cylinders, making it ideal for large fixtures requiring identical push and pull power. With a 250 mm stroke and a body length A of 435 mm, it fits large-scale tooling where a rear rod extension is needed for stroke confirmation or secondary actuation.
Operating on filtered air at 0.15-1.0 MPa, this ISO 6430 class cylinder uses a 1-inch PT port and features an adjustable air cushion (40 mm length) at both ends to decelerate massive loads smoothly. The tie-rod construction ensures serviceability, while the dual M42x2 rod threads provide robust attachment points. Its speed range is 30-500 mm/s, optimized for controlled, high-force linear movements rather than high-speed cycling.
Airtac SCD Standard Cylinder SCD250X250 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X250 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 250 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 SCD250X250
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×250 | 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 SCD250X250 Is Used
Heavy Pallet Transfer
Uses the rear rod to drive a secondary conveyor stop while the front rod pushes a 2-ton pallet, ensuring synchronized material flow in automated warehouses.
Bulk Material Compaction
Applies 23.5 kN of force from both rod ends to compact waste or recyclables into bales, with the through-rod providing equal pressure on dual compression plates.
Large Valve Actuation
The rear rod extension mounts a position sensor to verify full open/close status of a high-torque butterfly valve, while the front rod handles the actuation linkage.
Is the Airtac SCD Standard Cylinder SCD250X250 the Right Cylinder?
This 250 mm bore model is the powerhouse of the SCD line, stepping up significantly from the SCD200 (15080 N at 0.5 MPa). If your application requires less force, dropping to the 200 mm bore saves energy and physical space. For tasks needing only one working end, the single-rod SC250 is a lighter, more compact alternative. However, if you need a rear rod for a limit switch flag or dual-sided tooling, the SCD is the correct choice. For strokes of 250 mm, ensure the guided load is aligned to prevent bending moments on the exposed rear rod.
To replace an existing SCD250X250, match the 250 mm bore, 250 mm stroke, PT (or G) port thread, and the specific mounting accessory. This basic model comes without a magnet or brackets; if your original unit had a center trunnion (TC) or foot mount (LB), you must order the identical configuration. The double-rod design is not dimensionally interchangeable with ISO 15552 cylinders.
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 SCD250X250 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 23562 N, at 0.7 MPa it is 32987 N, and at the maximum operating pressure of 0.9 MPa it reaches 42412 N. The theoretical force at 1.0 MPa is 4805 kgf.
This specific SCD250X250 model does not include the -S magnet option, so standard reed or solid-state sensors cannot be directly clamped to the barrel. To use sensors like the CMSG or DMSG series, you must order the SCD250X250-S variant, which has a built-in magnetic piston ring.
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