The AirTAC Airtac SCD Standard Cylinder SCD250X600S 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, 600mm stroke, PT1" ports and adjustable end cushioning.
The SCD250X600S is a heavy-duty double-rod pneumatic cylinder that delivers identical push and pull thrust in both directions, removing the force asymmetry of a single-rod design. At 0.5 MPa supply pressure, this 250 mm bore unit generates 23562 N of force on both the extend and retract strokes, making it ideal for large fixtures that need balanced, two-sided actuation.
This model features a 600 mm stroke and a 50 mm diameter through-rod protruding from both end caps, providing superior bearing support and a convenient rear extension for mounting a secondary tool, stopper, or external sensor flag. The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. With a body length A(SCD) of 435 mm and an adjustable air cushion of 40 mm at each end, it decelerates high-inertia loads smoothly.
| Model | Airtac SCD Standard Cylinder SCD250X600S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 600 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. |
| ×600 | 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.
Uses the equal push and pull force of 23562 N at 0.5 MPa to operate two opposing clamp arms from a single cylinder, ensuring symmetrical grip pressure on large weldments or castings.
The through-rod connects to a transfer shuttle on one end and a shock absorber or counterbalance on the other, providing balanced drive and deceleration for pallets weighing several tonnes.
Powers a press tool with identical force in both closing and stripping directions, using the rear rod extension to mount a linear potentiometer for precise stroke position feedback.
Choose the SCD250 when your application demands balanced thrust above 20000 N in both directions. If your force requirement is lower, the SCD200 bore provides 15080 N at the same 0.5 MPa pressure, offering a more compact and cost-effective alternative. For applications that only need a single working direction, the single-rod SC250 cylinder delivers a higher push force (29452 N at 0.5 MPa) because the full bore area is available on the extend stroke.
At a 600 mm stroke, the long unsupported rod length on both ends can be susceptible to side loading and bending. If the load is not perfectly axial, use an external linear guide or switch to a guided cylinder to prevent premature rod bearing and seal wear. This SCD250X600S is a direct dimensional replacement only for another AirTAC SCD250 double-rod cylinder with the same 600 mm stroke, PT port thread, basic mounting, and magnet option.
Double-rod checklist
Because the piston rod passes through both end caps, the effective pressure area is identical in both directions. The push and pull 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 equal force and speed in both directions, or when you need to attach tooling, a sensor flag, or a mechanical stop to the rear rod. The through-rod also provides better guidance and resistance to side load than a single-rod cylinder, though it is not a substitute for an external guide in high-moment applications.
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