Airtac SCD Standard Cylinder SCD40X25S
The AirTAC Airtac SCD Standard Cylinder SCD40X25S 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, 25mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke25 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X25S
The SCD40X25S is a compact double-rod pneumatic cylinder that outputs an identical 528 N of force in both extend and retract strokes at 0.7 MPa, thanks to its Ø16 mm rod passing through both end caps. This symmetry is ideal for short-stroke, two-sided tooling tasks where a rear rod connection point is needed for a sensor flag or a secondary operation.
With a body length A(SCD) of 191 mm and a 21 mm adjustable air cushion, this 40 mm bore model handles precise end-of-stroke deceleration in a tight envelope. The built-in magnet, denoted by the -S suffix, allows direct mounting of CMSG or DMSG sensors on the tie-rod barrel for reliable, non-contact position sensing.
Airtac SCD Standard Cylinder SCD40X25S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X25S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 25 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 SCD40X25S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SCD40X25S Is Used
Two-Sided Actuation
The through-rod design allows tooling to be mounted on both ends, enabling a single cylinder to perform a push and pull operation simultaneously on two separate stations.
Rear Stroke Sensing
With the -S magnet option, a CMSG sensor can be mounted on the rear rod side to confirm retraction, a common need in transfer mechanisms where space at the front cap is blocked.
Anti-Rotation Fixtures
The dual-rod support provides better resistance to rod rotation than a single-rod cylinder, useful for maintaining the orientation of a small guided tool or label applicator.
Is the Airtac SCD Standard Cylinder SCD40X25S the Right Cylinder?
Choose the SCD40 when your application needs balanced push-pull output in a 40 mm bore class. If you require more force, stepping up to the SCD50 provides 1154 N at 0.7 MPa. For applications where only one end of the rod needs to perform work, a single-rod SC40 cylinder offers a higher push force on the full-bore side. This SCD40X25S is a direct replacement for another AirTAC SCD40 cylinder of the same 25 mm stroke, PT port thread, and built-in magnet, provided the mounting style matches.
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 SCD40X25S FAQ
The push and pull force is identical because it is a double-rod cylinder. 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.
You would choose an SCD when you need equal force and speed in both directions, or when you need to attach tooling, a stopper, or a position-sensing flag to the rear rod. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder of the same bore.
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