The AirTAC Airtac SCD Standard Cylinder SCD40X30S 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, 30mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X30S is a compact double-rod cylinder delivering balanced motion from both ends of its Ø16 mm through-rod. At 0.7 MPa, it provides an equal 528 N of force in both directions, making it ideal for short-stroke tasks where push and pull power must match precisely.
This model includes a built-in magnet (-S suffix), allowing you to mount CMSG or DMSG sensors directly on the tie-rod barrel for reliable end-of-stroke detection. The 30 mm stroke is a standard length for this 40 mm bore, and the adjustable air cushion on each end cap helps decelerate the piston smoothly within a 21 mm cushion length.
| Model | Airtac SCD Standard Cylinder SCD40X30S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 30 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. |
| ×30 | 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 through-rod allows a tooling plate on each end, perfect for shifting a part from one nest to another with identical force and speed in both stroke directions.
The dual-rod support inherently resists rotation, making it a solid choice for pushing components onto a press-fit arbor without needing an external guide for the rod itself.
The integrated magnet and 30 mm stroke are a common fit for compact fixtures where a CMSG sensor must confirm the retracted position in a tight space.
For a step up in force, the SCD50 series offers 825 N at the same 0.5 MPa pressure. If your application only requires force from one side, a single-rod SC cylinder is a more economical choice. This double-rod design provides better guidance than a single rod, but for significant side loads, a guided cylinder is still the correct engineering solution.
To replace an existing SCD40X30S, match the 40 mm bore, 30 mm stroke, PT port thread, and the magnetic piston option. The basic mounting style means no additional brackets are included, so you can reuse your existing FA or LB mounts if they are already installed.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. You get 528 N at 0.7 MPa and 950 N at the maximum operating pressure of 0.9 MPa in both directions.
Choose the SCD when you need to mount a tool or sensor flag on the rear rod, or when you require perfectly equal force and speed in both directions. The dual-rod support also provides better inherent alignment for the piston rod compared to a single-rod SC.
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