The AirTAC Airtac SCD Standard Cylinder SCD125X500 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 SCD125X500 is a double-acting, double-rod pneumatic cylinder that generates an identical 5734 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design where the 32 mm rod passes through both end caps. This symmetry eliminates force differentials, making it ideal for applications where a rear tooling plate, stroke sensor flag, or balanced bidirectional motion is required. With a 500 mm stroke and a body length A of 291 mm, the ISO 6430 class tie-rod construction provides robust guidance for the dual rod ends.
At the maximum operating pressure of 0.9 MPa, the output force reaches 10321 N, while the adjustable air cushion with a 28 mm length decelerates the piston smoothly at both ends of travel. The PT1/2 ports and M27x2 rod threads are standard, and the cylinder operates on 40 µm filtered air across a -20 to +70 °C temperature range. This model is a genuine AirTAC unit, factory-built for consistent performance in demanding industrial sequences.
| Model | Airtac SCD Standard Cylinder SCD125X500 |
|---|---|
| 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 and pull force of 5734 N at 0.5 MPa powers shuttle tables that move heavy pallets or components between two parallel conveyor lines with identical speed and force in each direction.
Use the rear rod extension to mount a secondary forming die or a positive stop, while the front rod performs the primary clamping action, ensuring perfectly synchronized, non-rotating movement for assembly fixtures.
Mount a DMSG magnetic sensor on the rear rod to confirm full retraction for a safety interlock, while the front rod drives the main tooling, creating a compact, self-monitoring actuation system without extra brackets.
Select the SCD125X500 when you need equal, high-force actuation from both ends of the cylinder. If your load requires less force, stepping down to the SCD100 bore reduces the output to 3681 N at 0.5 MPa, saving air consumption and space. For applications that only need a single working end, the standard SC single-rod cylinder is a more economical choice, but you will lose the rear rod extension for mounting brackets or flags. For a direct replacement, match the 125 mm bore, 500 mm stroke, PT1/2 thread, and ensure the mounting accessory and magnet option (-S) are identical to your existing SCD unit.
At a 500 mm stroke, the long unsupported rod sections on both sides are susceptible to bending under side loads. If your application involves any lateral force, do not rely on the through-rod alone for guidance; pair the cylinder with an external linear guide rail or switch to a dedicated guided cylinder to prevent premature rod bearing wear and seal failure.
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 reaches 10321 N in both directions.
Choose the SCD125X500 when your application needs a rear rod end to mount tooling, stoppers, or sensor flags, or when you require perfectly balanced force and speed in both directions. The through-rod design also provides better resistance to rod rotation than a single-rod cylinder. If you only need force from one end, the SC single-rod series is a more cost-effective alternative.
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