The AirTAC Airtac SCD Standard Cylinder SCD250X75 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, 75mm stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCD250X75 is a heavy-duty double-rod pneumatic cylinder engineered for applications demanding identical force and speed in both directions. With a 250 mm bore and a 50 mm rod passing completely through both end caps, it provides a symmetrical 23562 N of thrust at 0.5 MPa, making it ideal for large-scale tooling that requires a rear rod connection for a stopper or sensor flag.
This ISO 6430 class tie-rod cylinder features a 75 mm standard stroke and an adjustable air cushion at each end (40 mm length) to decelerate high-inertia loads smoothly. The retracted body length A(SCD) is 435 mm, and the 1-inch PT port supplies ample flow for consistent cycling. Its through-rod design naturally improves rod guidance and resists rotation better than a single-rod cylinder of similar size.
| Model | Airtac SCD Standard Cylinder SCD250X75 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 75 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.
| 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.
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×75 | 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.
The equal push/pull force of 23562 N at 0.5 MPa ensures a heavy transfer shuttle moves with identical speed and power in both directions, preventing timing skew on large pallet systems.
Mount a pressing tool on the front rod and a stripper plate or limit switch dog on the rear rod, using the through-rod design to synchronize two operations from one cylinder body.
The 50 mm through-rod provides inherent anti-rotation for wide stop gates, while the 40 mm cushion at each end softly arrests the 75 mm stroke without metal-to-metal impact.
Select the SCD250 when your application requires the 23562 N force available at 0.5 MPa in both directions. If a lower force suffices, the SCD200 offers 15080 N at the same pressure, reducing air consumption and physical footprint. For tasks needing only a single working end, the standard SC single-rod cylinder is a more economical choice.
This model is a direct dimensional replacement only for another AirTAC SCD250 cylinder matching the 75 mm stroke, 1-inch PT port, and basic mounting. For strokes of 300 mm or more, the long unsupported 50 mm rod is susceptible to bending under side loads; in such cases, incorporate an external linear guide or switch to a dedicated guided cylinder to protect the rod bearings and seals.
Double-rod checklist
Because the SCD is a double-rod cylinder, the effective piston area is identical on both sides. The push and pull force is 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and reaches 42412 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD250X75 when you need equal force and speed in both directions, or when you must attach tooling, a sensor flag, or a mechanical stop to the rear rod. The through-rod also provides better support and natural anti-rotation for the piston assembly compared to a single-rod SC cylinder.
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