Airtac SCD Standard Cylinder SCD40X25
The AirTAC Airtac SCD Standard Cylinder SCD40X25 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 SCD40X25
The SCD40X25 double-rod pneumatic cylinder provides identical 528 N of force in both the extend and retract strokes at 0.5 MPa, thanks to its through-rod design that equalizes the effective piston area on each side. With a 16 mm diameter rod protruding from both end caps, this 25 mm stroke unit is ideal for compact applications needing symmetric motion, such as operating a two-sided clamping fixture or a small transfer gate.
Built on a tie-rod body with a retracted length of 191 mm, the cylinder includes an adjustable air cushion (21 mm long) to decelerate the piston smoothly at each end of travel. The PT1/4 ports and M12x1.25 rod threads are standard, and the operating range spans 0.15 to 1.0 MPa, making it a robust choice for short-stroke, balanced-force tasks.
Airtac SCD Standard Cylinder SCD40X25 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X25 |
|---|---|
| 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 SCD40X25
| 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 SCD40X25 Is Used
Two-Sided Actuation
Operates tooling or clamps from both ends of the cylinder simultaneously, using the exposed rear rod to mirror the front action.
Anti-Rotation Guide
The dual-rod support provides better resistance to rod rotation than a single-rod cylinder, useful for maintaining alignment in short-stroke pushers.
Compact Equal-Force Press
Delivers a matched 528 N pressing force in both directions for light assembly tasks where the work must be engaged and retracted with identical power.
Is the Airtac SCD Standard Cylinder SCD40X25 the Right Cylinder?
Choose the SCD40X25 when your mechanism requires equal push and pull thrust from a compact double-rod package. If you need more force, stepping up to the 50 mm bore SCD50 series provides 825 N at the same 0.5 MPa pressure. For applications where the force asymmetry of a single-rod cylinder is acceptable, the standard SC40 series offers a higher push force, as the full bore area is available on the extend stroke. To ensure a direct dimensional and functional replacement, match an existing SCD unit by its 40 mm bore, 25 mm stroke, PT port thread, and basic mounting configuration.
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 SCD40X25 FAQ
The force is identical in both directions because the piston rod passes through the entire cylinder. At 0.5 MPa, it produces 528 N; at 0.7 MPa, 739 N; and at the maximum operating pressure of 0.9 MPa, it delivers 950 N of force.
You would choose the SCD model when you need perfectly equal speed and force for both the extend and retract strokes, or when you need to mount a sensor flag, stopper bolt, or secondary tooling on the rear rod. The single-rod SC cylinder provides a higher push force because the full piston area is used, but its pull force is lower.
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