The AirTAC Airtac SCD Standard Cylinder SCD125X500S 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, 500mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X500S is a heavy-duty double-rod pneumatic cylinder that outputs an identical 5734 N of thrust in both extend and retract directions at 0.5 MPa, rising to a substantial 10321 N at 0.9 MPa. Its 32 mm diameter rod passes through both end caps, providing a rear rod extension that is ideal for mounting external stroke sensors, stopper bolts, or a secondary tool plate, all while improving bearing support.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. With a 500 mm stroke, an ISO 6430 class body length of 291 mm, and an adjustable air cushion of 28 mm at each end, it is engineered for demanding, high-force, two-sided actuation tasks.
| Model | Airtac SCD Standard Cylinder SCD125X500S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 500 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. |
| ×500 | 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 makes this cylinder perfect for shuttle tables that must move a heavy fixture between two stations with identical speed and power in each direction.
The through-rod design lets you mount a sensor flag or cam on the rear rod, while the built-in magnet (-S) on the barrel allows CMSG/DMSG sensors to confirm piston position, creating a redundant sensing setup for safety-critical systems.
With 10321 N of force at 0.9 MPa available from both ends, this cylinder is suited for light straightening fixtures or press tools where the workpiece must be accessed or actuated from either side of the machine frame.
Select the SCD125X500S when your application requires balanced, high-force motion in both directions. If you need even more thrust, stepping up to the SCD160 bore delivers 9425 N at 0.5 MPa. For applications that only need force on one side of the piston, a single-rod SC125 cylinder would be a simpler and more cost-effective choice. For direct replacement, match the 125 mm bore, 500 mm stroke, PT port thread, basic mounting, and the integrated magnet.
At this 500 mm stroke length, the unsupported rod mass can create a bending moment under side loads. If the tooling attached to either rod end is heavy or off-centre, use external linear guides or consider a guided cylinder to prevent premature rod bearing and seal wear.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. The effective piston area is the same on both sides. At 0.5 MPa it produces 5734 N, at 0.7 MPa it produces 8028 N, and at the maximum operating pressure of 0.9 MPa it produces 10321 N.
Choose the SCD when you need perfectly symmetrical force and speed in both directions, or when you need to mount tooling, a stop, or a sensor target on the rear rod. The through-rod also provides better support for the piston, reducing uneven wear, but it is not a replacement for an externally guided cylinder under high side loads.
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