The AirTAC Airtac SCD Standard Cylinder SCD40X350S 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, 350mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD40X350S is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, giving you perfectly matched force and speed in each direction. At 0.5 MPa, it outputs 528 N of thrust both extending and retracting, making it ideal for applications that need symmetric motion or where a tool can be mounted on the rear rod.
This 40 mm bore model features a 16 mm diameter through-rod and a body length of 191 mm, with an adjustable air cushion of 21 mm at each end for smooth deceleration. The built-in magnet (denoted by the -S suffix) allows you to mount CMSG, DMSG, or EMSG sensors directly onto the tie-rod barrel for precise, non-contact position feedback without extra brackets.
| Model | Airtac SCD Standard Cylinder SCD40X350S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 350 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. |
| ×350 | 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 force in both directions and the rear rod extension make the SCD40X350S perfect for shuttling parts between two stations, where a stopper or secondary tool can be fixed to the back end.
With the integrated magnet, this cylinder is ready for CMSG/DMSG sensors to be clamped on. Use it in automated sequences where the controller must confirm end-of-stroke position on both sides of a 350 mm sweep.
The dual-rod design provides better inherent guidance than a single-rod cylinder. It's a solid choice for a 350 mm push application where you need to prevent the tooling from rotating without adding an external guide.
Choose the SCD40 when your application requires balanced push-pull force in a compact envelope. If you need more thrust, stepping up to the 50 mm bore SCD50 provides 825 N at the same 0.5 MPa pressure. For tasks that only need force in one direction, a single-rod SC cylinder offers a larger push force from the same bore size. This 350 mm stroke model has a long, unsupported rod; if your load applies any significant side force, pair the cylinder with an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
To replace an existing unit, match the 40 mm bore, 350 mm stroke, PT port thread, basic mounting style, and the magnetic piston option. The genuine AirTAC SCD40X350S is a direct, form-fit replacement for another AirTAC SCD with the same specifications.
Double-rod checklist
Because it's a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa, the force is 528 N. At the maximum operating pressure of 0.9 MPa, the force increases to 950 N in both directions.
Choose an SCD when you need perfectly symmetrical force and speed, or when you can use the rear rod extension for mounting a sensor flag, a mechanical stop, or secondary tooling. The through-rod also provides better support for the piston, improving side-load resistance compared to a single-rod cylinder of the same size.
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