The AirTAC Airtac SCD Standard Cylinder SCD125X125 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, 125mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X125 double-rod pneumatic cylinder provides identical 5734 N output in both extend and retract strokes at 0.5 MPa, thanks to its through-rod construction where a 32 mm rod exits both end caps. This symmetry eliminates force differentials, making it ideal for applications requiring balanced, two-sided actuation like transfer shuttles or dual-tooling fixtures.
With a 125 mm stroke and a 28 mm adjustable air cushion at each end, the cylinder decelerates the piston smoothly without metal-to-metal impact. The body length A(SCD) is 291 mm, and the ISO 6430 class tie-rod design uses a PT1/2 port. At the maximum operating pressure of 0.9 MPa, the thrust reaches 10321 N in either direction.
| Model | Airtac SCD Standard Cylinder SCD125X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 125 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. |
| ×125 | 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 5734 N force in both directions and the rear rod extension make it perfect for shuttling parts between two parallel conveyors, where tooling can be mounted on both rod ends.
Delivers identical push and pull force for balanced clamping or press-fit operations, preventing part distortion that can occur with unequal single-rod cylinder forces.
The protruding rear rod provides a convenient, clean surface to mount a sensor flag or cam for external stroke confirmation without interfering with the front tooling.
For a step up in force, the SCD160 bore offers 9425 N at 0.5 MPa, while the SCD100 bore provides 3681 N if a smaller footprint is needed. If your application only requires actuation from one side, a single-rod SC125 cylinder may be a simpler choice, but it will have unequal push/pull forces. For direct replacement, match the 125 mm bore, 125 mm stroke, PT port thread, and any SCD mounting accessory like FA or LB. The through-rod provides better guidance than a single rod, but sustained side loads still require an external guide rail or a guided cylinder.
Double-rod checklist
Because the piston rod passes through both ends, the effective pressure area is identical in both directions. The force is 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you need to attach tooling, a stop, or a sensor target to the rear rod. The dual-rod support also provides better resistance to bending moments than a single-rod cylinder of the same bore.
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