The AirTAC Airtac SCD Standard Cylinder SCD40X125 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 125mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X125 is a double-acting pneumatic cylinder with a piston rod that extends from both ends, providing exactly 528 N of thrust in each direction at 0.5 MPa. Because the rod area is subtracted from both sides of the piston, push and pull forces are identical, making this 40 mm bore unit ideal for tasks requiring balanced, repeatable motion in both directions.
With a 125 mm stroke and a 16 mm diameter rod passing through both caps, this cylinder offers better bearing support than a single-rod design. The body length A(SCD) is 191 mm, and it features an adjustable air cushion of 21 mm at each end to decelerate the piston smoothly. It operates on filtered air from 0.15 to 1.0 MPa via PT1/4 ports.
| Model | Airtac SCD Standard Cylinder SCD40X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 125 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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.
Operates a shuttle table or transfer bar that requires identical push and pull force to move a workpiece between two stations without tuning different pressures for each direction.
Drives a clamping mechanism where the rear rod applies a secondary holding force or returns a tool, ensuring the 528 N output is available on both the advance and retract strokes.
The 16 mm rod protruding from the rear cap provides a convenient mounting point for a sensor flag or cam, enabling end-of-stroke detection without adding hardware to the working end.
Choose the SCD40X125 when you need equal force and speed in both directions from a compact 40 mm bore. If 528 N at 0.5 MPa is insufficient, stepping up to the SCD50 bore provides 825 N. If your load only requires force in one direction, the single-rod SC series is a simpler, more cost-effective choice. For direct replacement, match the 40 mm bore, 125 mm stroke, PT1/4 ports, and basic mounting. If you need position sensing, specify the -S magnet option to use CMSG/DMSG sensors.
Double-rod checklist
The push and pull forces are identical. At 0.5 MPa, it outputs 528 N. At 0.7 MPa, the force is 739 N, and at the maximum operating pressure of 0.9 MPa, it reaches 950 N. The theoretical force at 1.0 MPa is 108 kgf.
You choose the SCD when you need equal force and speed in both directions, or when you need to mount a tool, stopper, or sensor target on the rear rod. The through-rod also provides better guidance and resistance to rotation than a single-rod cylinder, though it is not a substitute for an externally guided unit under heavy side loads.
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