The AirTAC Airtac SCD Standard Cylinder SCD125X350 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 350mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X350 is a double-acting, double-rod pneumatic cylinder where the 32 mm rod extends from both ends, giving identical 5734 N of force in each direction at 0.5 MPa. This symmetry eliminates force differentials, making it ideal for applications where a tool or sensor flag must be mounted on the rear rod, or where balanced thrust is critical for a 350 mm stroke.
At the maximum operating pressure of 0.9 MPa, this tie-rod cylinder produces 10321 N of thrust both ways. The ISO 6430 class body has a length A(SCD) of 291 mm and an adjustable air cushion of 28 mm at each end to decelerate the piston smoothly. Its PT1/2 ports and M27x2 rod threads suit robust pneumatic connections.
| Model | Airtac SCD Standard Cylinder SCD125X350 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 350 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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, 28 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 5734 N at 0.5 MPa ensures a transfer shuttle moves with identical speed and power in both directions, preventing product shifting on a 350 mm stroke.
With a rod on both ends, one side can drive the main load while the rear rod operates a secondary mechanism, such as a stripper plate or an interlock, in perfect synchronization.
The twin-rod design provides inherent anti-rotation stability for a 350 mm long pusher bar, keeping it aligned without needing an external guide for light, on-axis pushing tasks.
Step down to the SCD100 bore if 3681 N of force at 0.5 MPa is sufficient for your 350 mm stroke, as it offers a more compact footprint. For a 350 mm stroke, the long unsupported rod on a double-rod cylinder can be prone to bending under side loads; use an external linear guide or consider a guided cylinder if the load is not purely axial. This model is the correct choice when you need a rear rod for cams or sensing.
For a drop-in replacement, match the 125 mm bore, 350 mm stroke, PT port thread, and the specific SCD mounting accessory (such as the F-SC125TC centre trunnion or F-SC125LB foot mount). The basic SCD125X350 model does not include a magnet; if your setup uses CMSG/DMSG sensors, order the -S variant.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 5734 N, at 0.7 MPa it outputs 8028 N, and at the maximum operating pressure of 0.9 MPa it delivers 10321 N in both directions.
Choose the SCD125X350 when you need a rear rod extension for mounting sensors, cams, or a secondary tool, or when you require perfectly balanced thrust and speed in both directions. The single-rod SC series has a higher push force due to the full piston area, but its pull force is lower.
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