The AirTAC Airtac SCD Standard Cylinder SCD125X65 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, 65mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X65 is a double-acting, double-rod pneumatic cylinder that outputs an identical 5734 N in both push and pull directions at 0.5 MPa, thanks to its through-rod design where the 32 mm rod area is subtracted from both sides of the piston. This symmetry is essential for applications requiring balanced force and speed, such as operating tooling on both ends of the cylinder or preventing rod bending in a push-only setup. The 65 mm stroke is well within the 1500 mm maximum for this bore, and the body length A(SCD) is 291 mm.
Built to the ISO 6430 class for tie-rod cylinders, this 125 mm bore unit features adjustable pneumatic cushioning at both ends with a 28 mm cushion length to decelerate the piston smoothly. The rear rod extension provides a convenient location for mounting a sensor flag, a mechanical stop, or secondary tooling, enhancing the cylinder's utility in compact automation cells. Its PT1/2 ports and M27x2 knuckle threads are standard for this force class.
| Model | Airtac SCD Standard Cylinder SCD125X65 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 65 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. |
| ×65 | 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 the SCD125X65 ideal for shuttling a workpiece carrier between two stations, where the rear rod can simultaneously actuate a secondary gate or stop.
With a 32 mm rod guided by bearings in both end caps, this cylinder offers superior resistance to rod rotation compared to a single-rod type, making it a strong choice for a pusher that must maintain angular alignment without an external guide.
Mount a pressing tool on the front rod and a stripper plate on the rear rod. The 65 mm stroke and balanced force ensure both tools move in perfect synchronization, driven by a single compact cylinder body.
Select the SCD125X65 when your application demands balanced, two-sided actuation with a force of 5734 N at standard plant pressure. If your load requires slightly less force, the SCD100 bore provides 3681 N at 0.5 MPa, offering a more compact and cost-effective alternative. For higher thrust, the SCD160 bore steps up to 9425 N at the same pressure. If you only need force from one end, a single-rod SC series cylinder is a simpler choice, but you will lose the equal force/speed characteristic and the utility of the rear rod extension.
To guarantee a drop-in replacement, match the 125 mm bore, 65 mm stroke, PT port thread, and the specific SCD mounting accessory (this is a basic mount model). The built-in magnet is not present on this -S suffix-free model, so sensor mounting requires external brackets. For strokes longer than 300 mm on a double-rod cylinder, always assess the unsupported rod length for buckling under compressive loads; this shorter 65 mm stroke operates well within safe limits.
Double-rod checklist
The push and pull forces are identical because the piston rod passes through both ends. At 0.5 MPa, the force is 5734 N; at 0.7 MPa, it is 8028 N; and at the maximum operating pressure of 0.9 MPa, it reaches 10321 N. The theoretical force at 1.0 MPa is 1169 kgf.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you want to use the rear rod extension for mounting sensors, cams, or secondary tooling. The dual-bearing support also provides better side-load tolerance and anti-rotation properties than a single-rod cylinder, though it is not a substitute for a fully guided unit under high side loads.
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