The AirTAC Airtac SCD Standard Cylinder SCD125X50S 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, 50mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X50S is a double-acting, double-rod pneumatic cylinder providing perfectly symmetrical force output in both directions. With a 125 mm bore and a 32 mm rod extending from both ends, it generates an identical 5734 N of push and pull force at 0.5 MPa, making it ideal for applications where balanced, two-sided actuation is critical.
This model includes a built-in magnet (-S suffix), allowing easy mounting of CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for precise end-of-stroke detection. The short 50 mm stroke, combined with a 28 mm air cushion on each end, ensures rapid, controlled cycling with minimal end-cap impact.
| Model | Airtac SCD Standard Cylinder SCD125X50S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 50 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. |
| ×50 | 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 and pull force of 5734 N at 0.5 MPa makes this cylinder perfect for shuttling heavy parts between two stations, with the rear rod available to actuate a secondary mechanism or counterbalance.
Use the front and rear rod ends to drive two opposing clamp arms simultaneously from a single cylinder, ensuring perfectly synchronized and balanced clamping force on a large workpiece.
The through-rod design provides inherent anti-rotation for a front pusher plate, while the rear rod extension can easily carry a sensor flag to confirm the retracted position via the built-in magnet.
Choose the SCD125 bore when your application demands over 5700 N of force in both directions at standard shop air pressure. If your load requires less force, stepping down to the SCD100 bore provides 3681 N at 0.5 MPa, which may reduce air consumption and overall footprint. For applications needing a stroke longer than 1500 mm, a non-standard order is required.
This double-rod unit is the correct choice over a single-rod SC when you need to attach tooling, a mechanical stop, or a sensor flag to the rear rod. However, for significant side loads, a guided cylinder is necessary, as the dual-rod design improves guidance but does not eliminate the risk of rod bending. To replace an existing SCD125X50S, match the 125 mm bore, 50 mm stroke, PT port thread, basic mounting, and the -S magnet option.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa, it produces 5734 N in both directions. The force increases to 8028 N at 0.7 MPa and 10321 N at the maximum operating pressure of 0.9 MPa.
Choose an SCD when you need equal force and speed in both directions, or when you require a rear rod extension to mount tooling, a mechanical stop, or a position sensor flag. The through-rod also provides better guidance and resistance to side load than a single-rod cylinder, though it is not a substitute for a fully guided unit under high lateral forces.
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