The AirTAC Airtac SCD Standard Cylinder SCD250X450 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, 450mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X450 is a heavy-duty double-rod pneumatic cylinder that outputs an identical 23562 N in both extension and retraction at 0.5 MPa, thanks to a 50 mm rod passing through both end caps. This symmetric force profile is critical for large fixtures where an unbalanced push-pull would cause tooling deflection or inconsistent cycle times.
At 0.9 MPa the thrust reaches 42412 N each way, and the 450 mm stroke sits well within the 1500 mm maximum for this bore. The body length A(SCD) is 435 mm, and the adjustable air cushion on each end is set to 40 mm to decelerate high-inertia loads smoothly. The rod ends carry an M42x2 thread for robust attachment of tooling on both sides.
| Model | Airtac SCD Standard Cylinder SCD250X450 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 450 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. |
| ×450 | 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 through rod allows a counterweight or secondary platen to be mounted on the rear, balancing the load and providing equal 42412 N of lift force at 0.9 MPa on both the front and rear connections.
Delivers a symmetrical 23562 N at 0.5 MPa for pressing operations where the rod must extend through the workpiece to support tooling on the far side, maintaining perfect alignment under load.
The rear rod end can drive a secondary mechanism or a sensor flag in perfect synchronization with the main carriage, simplifying control architecture for large material transfer systems.
Step down to the SCD200 bore if 15080 N at 0.5 MPa covers your load, saving space and weight. For applications needing only one working end, a single-rod SC250 cylinder provides a higher push force on the full-bore side. The long 450 mm stroke on this double-rod design offers better inherent guidance than a single rod, but if the load applies a significant side force, an external linear guide or a guided cylinder is still required to prevent rod bending.
To replace an existing SCD250X450, match the bore, 450 mm stroke, PT port thread, SCD-specific mounting accessory (basic, FA, LB, or TC), and the magnet option if sensors are used. This is an ISO 6430 class tie-rod cylinder, not an ISO 15552 profile unit.
Double-rod checklist
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 in both directions.
Choose the SCD when you need equal force and speed in both directions, or when you need to mount tooling, a stop, or a position sensor on the rear rod. The through rod also provides better bearing support than a single-rod cylinder, reducing rod deflection in applications with moderate side loads.
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