The AirTAC Airtac SCD Standard Cylinder SCD40X165 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, 165mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X165 double-rod pneumatic cylinder provides a symmetric 528 N of force in both directions at 0.5 MPa, thanks to its through-rod design that subtracts the same 16 mm rod area from each side. This 165 mm stroke model is a direct fit for tasks needing equal speed and thrust for tooling mounted on both ends of the piston rod.
With a body length A(SCD) of 191 mm and an adjustable air cushion of 21 mm, it decelerates the load smoothly at each end of travel. The PT1/4 ports and M12x1.25 rod threads are standard across the 40 mm bore, and the tie-rod construction keeps it serviceable in demanding industrial environments.
| Model | Airtac SCD Standard Cylinder SCD40X165 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 165 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. |
| ×165 | 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 rod extending from both ends allows a single cylinder to push a part into a fixture while simultaneously retracting a stop pin on the opposite side, synchronizing two movements with one actuation.
Dual rod support from both end caps provides inherent anti-rotation, making it suitable for pushing loads on a linear rail without adding an external guide for light-duty alignment tasks.
Mount a sensor flag or a secondary tool on the rear rod to trigger an external limit switch, keeping the front work area clear while providing precise end-of-stroke position feedback.
Choose this 40 mm bore when your application needs around 528 N of balanced force at standard plant pressure. If you require more thrust, stepping up to the SCD50 bore provides 825 N at the same 0.5 MPa, while the smaller SCD32 delivers 345 N for lighter, more compact dual-rod setups. For applications where force multiplication on the push stroke is needed, a single-rod SC series cylinder is the better choice.
This is a direct replacement for any AirTAC SCD40X165 cylinder matching the PT port thread and basic mounting. If your stroke exceeds 300 mm, be mindful of potential rod deflection on the unsupported through-rod; an external linear guide or a switch to a guided cylinder will protect the rod bearings from side loads.
Double-rod checklist
Because the piston rod passes through both ends of the cylinder, the effective pressure area is identical in both directions. The force is 528 N at 0.5 MPa, 739 N at 0.7 MPa, and reaches 950 N at the maximum operating pressure of 0.9 MPa.
Select the SCD when you need perfectly equal force and speed in both directions, or when you must mount tooling, a stopper, or a 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 a fully guided actuator under high side loads.
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