Airtac SCD Standard Cylinder SCD40X400S
The AirTAC Airtac SCD Standard Cylinder SCD40X400S 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke400 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X400S
The SCD40X400S is a double-acting, double-rod pneumatic cylinder delivering identical 528 N of force in both push and pull directions at 0.5 MPa, thanks to its through-rod design. The 16 mm diameter rod extends from both ends, providing a balanced platform for mounting tooling, stoppers, or sensor flags on the rear side while maintaining equal speed and thrust in each stroke.
This 40 mm bore model features a 400 mm stroke, PT1/4 ports, and an M12x1.25 rod thread. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for reliable, non-contact position sensing. Its body length A(SCD) is 191 mm, and it includes an adjustable air cushion (21 mm) for smooth deceleration.
Airtac SCD Standard Cylinder SCD40X400S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X400S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 400 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.
Theoretical Output Force (Ø40mm, double rod)
| 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.
Model Code: Airtac SCD Standard Cylinder SCD40X400S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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.
Where the Airtac SCD Standard Cylinder SCD40X400S Is Used
Two-Sided Transfer Shuttles
The rod extending from both ends allows a single cylinder to push a part into position and simultaneously retract a stop pin on the opposite side, simplifying shuttle table mechanisms.
Rear-Mounted Stroke Sensing
With the built-in magnet, a sensor can be clamped to the barrel to detect piston position, while the rear rod carries a physical flag for a secondary limit switch, giving redundant end-of-stroke confirmation.
Anti-Rotation Pushers
The dual-rod support improves resistance to rod rotation, making this cylinder suitable for pushing applications where maintaining the orientation of an attached plate or tool is critical.
Is the Airtac SCD Standard Cylinder SCD40X400S the Right Cylinder?
This 40 mm bore double-rod cylinder suits applications needing equal bidirectional force around 528 N at 0.5 MPa. If your load requires more thrust, stepping up to the 50 mm bore SCD series provides 825 N at the same pressure. For purely single-sided actuation where a rear rod is unnecessary, a standard SC single-rod cylinder is a simpler, more compact choice.
At a 400 mm stroke, ensure the long unsupported rod is not subjected to significant side loads; if lateral forces are present, use an external guide rail or switch to a guided cylinder. As a direct replacement, match the 40 mm bore, 400 mm stroke, PT port thread, basic mounting, and the -S magnet option to another genuine AirTAC SCD40X400S.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCD Standard Cylinder SCD40X400S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 528 N, at 0.7 MPa it outputs 739 N, and at the maximum operating pressure of 0.9 MPa it delivers 950 N in both directions.
Choose an SCD when you need equal force and speed in both directions, or when you require a rear rod extension to mount tooling, a cam, or a sensor flag. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a substitute for a fully guided unit under high side loads.
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