The AirTAC Airtac SCD Standard Cylinder SCD250X600 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 SCD250X600 is a heavy-duty double-rod pneumatic cylinder that outputs an identical 23562 N of thrust in both directions at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa. Because the 50 mm diameter piston rod passes through both end caps, the effective pressure area is the same on each side, giving you perfectly symmetrical force and speed for large-scale, balanced tooling. The 600 mm stroke is well within the 1500 mm maximum standard stroke for this bore, and the adjustable air cushion (40 mm length) helps decelerate high-inertia loads smoothly at each end of travel.
This ISO 6430 class tie-rod cylinder uses a PT1 inch port and an M42x2 knuckle thread on both rod ends, making it straightforward to attach tooling, brackets, or stroke-reading flags on either side. The body length A(SCD) is 435 mm, and the overall retracted length is longer than a comparable single-rod SC cylinder because the rod protrudes from the rear cap as well. When you need a large-bore actuator that can push and pull a heavy carriage with equal authority, the SCD250X600 provides that balanced performance without the complexity of external guides for the rod itself.
| Model | Airtac SCD Standard Cylinder SCD250X600 |
|---|---|
| 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.
Moves a large welding fixture or heavy pallet between two stations with equal speed and force in both directions, eliminating the need for different flow control settings for extend and retract.
The rear rod can drive a secondary stripping plate or ejector mechanism in sync with the main platen, using the identical 42412 N thrust at 0.9 MPa on both sides for coordinated motion.
The exposed rear rod provides a convenient mounting point for a sensor flag or linear encoder, allowing precise position feedback without interfering with the primary tooling on the front rod end.
Choose the SCD250X600 when your application demands balanced, high-force actuation in both directions. If your load requires slightly less force, stepping down to the SCD200 bore reduces the 0.5 MPa output to 15080 N, while still using the same M36x2 rod thread. For applications that only need force in one direction, the single-rod SC250 series offers a higher push force because the full bore area is available on the extend stroke, making it a more efficient choice for simple pressing or clamping tasks.
At a 600 mm stroke, the long unsupported rod sections on both ends can experience bending under significant side loads. If your tooling applies any radial force, do not rely on the through-rod alone for guidance; pair the cylinder with an external linear guide or switch to a dedicated guided cylinder. For a direct replacement, match the 250 mm bore, 600 mm stroke, PT1 inch port thread, and ensure the mounting accessory (if any) is from the SCD subset—basic, FA front flange, LB foot, or TC centre trunnion with TCM1 bracket. Adding the -S magnet option allows CMSG/DMSG sensors to detect piston position directly on the tie-rod barrel.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 23562 N, at 0.7 MPa it produces 32987 N, and at the maximum operating pressure of 0.9 MPa it delivers 42412 N in both directions.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you want to use the rear rod extension for mounting a sensor flag, a mechanical stop, or secondary tooling. The through-rod design also provides better support for the piston and rod bearings than a single-rod cylinder, though it is not a substitute for an external guide system if the load applies a side force.
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