The AirTAC Airtac SCD Standard Cylinder SCD125X450 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, 450mm stroke, PT1/2 ports and adjustable end cushioning.
The SCD125X450 is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions, making it a natural fit for symmetrical transfer mechanisms and tooling that needs a rear connection point. With a 125 mm bore and a 32 mm through-rod, this model generates 5734 N of thrust each way at 0.5 MPa, rising to 10321 N at 0.9 MPa.
At 450 mm of stroke, the extended overall length is substantial, built around the 291 mm body length (A dimension) of the SCD125 frame. The adjustable air cushion at each end, with a 28 mm cushion length, decelerates the piston smoothly, while the PT1/2 ports and M27x2 rod threads handle the high flow and mechanical connection demands of this ISO 6430 class tie-rod cylinder.
| Model | Airtac SCD Standard Cylinder SCD125X450 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 450 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. |
| ×450 | 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 the SCD125X450 drives a transfer shuttle back and forth with perfectly matched acceleration and deceleration profiles, simplifying flow control setup on both ends of a linear transfer line.
With a rear rod extension, this cylinder can simultaneously actuate two opposing clamp arms or straightening dies from a single air supply, ensuring mechanical synchronisation without complex linkages.
The protruding rear rod provides a convenient, clean mounting point for a target flag or cam that triggers external limit switches, keeping the sensor package away from the harsh front-end tooling environment.
Choose the SCD125 when your application needs symmetric force around 5734 N at 0.5 MPa. If you can accept a force reduction, stepping down to the SCD100 bore drops output to 3681 N at the same pressure, saving space and air consumption. For higher thrust, the SCD160 delivers 9425 N at 0.5 MPa. This double-rod design is ideal when you need to attach tooling or a sensor flag to the rear rod, but if the load is entirely one-sided, a single-rod SC125 may be a simpler, more compact choice.
At a 450 mm stroke, the unsupported rod length on both ends can create a bending moment under side load. If the cylinder pushes a guided load, the rod’s own rigidity is often sufficient, but for unguided masses or off-centre forces, pair it with an external linear guide or consider a guided cylinder. To replace an existing SCD125X450, match the 125 mm bore, 450 mm stroke, PT port thread, basic mounting style, and absence of a magnet.
Double-rod checklist
Because the piston rod extends through both end caps, 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. The theoretical output at 1.0 MPa is 1169 kgf.
Select the SCD when you need the same force and speed in both directions, or when the rear rod can be used to mount a secondary tool, a stopper bolt, or a position-sensing flag. The through-rod also provides better guidance and anti-rotation resistance than a single-rod cylinder, though it is not a substitute for an external guide when significant side loads are present.
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