Airtac SCD Standard Cylinder SCD40X800
The AirTAC Airtac SCD Standard Cylinder SCD40X800 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, 800mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke800 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X800
The SCD40X800 double-rod pneumatic cylinder provides a balanced 528 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design that subtracts the 16 mm rod area from both piston faces. With an 800 mm stroke and a body length A(SCD) of 191 mm, this tie-rod actuator is built for applications needing equal force and speed on the extend and retract strokes.
A rear rod extension is standard, allowing you to mount a secondary tool, a hard stop, or a sensor flag directly on the back of the cylinder. The adjustable air cushion at each end (21 mm length) decelerates the piston smoothly, and the PT1/4 ports keep plumbing straightforward for medium-duty automation tasks.
Airtac SCD Standard Cylinder SCD40X800 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X800 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 800 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 SCD40X800
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SCD40X800 Is Used
Two-Sided Actuation
The rod protruding from both end caps lets you mount tooling on each side, performing a push operation in one direction and a pull operation in the other with perfectly matched force.
Anti-Rotation Pusher
The dual-rod support provides better guidance than a single-rod cylinder, helping to resist rotation of the tooling plate during long 800 mm transfer strokes.
Rear Stroke Sensing
Attach a sensor flag or cam to the rear rod extension to trigger end-of-stroke signals without interfering with the primary tooling on the front rod end.
Is the Airtac SCD Standard Cylinder SCD40X800 the Right Cylinder?
Choose the SCD40X800 when your mechanism requires identical push and pull output, such as a two-sided processing station. If you need more force, the SCD50 bore steps up to 825 N at 0.5 MPa; for a lighter, compact design, the SCD32 provides 345 N. A single-rod SC cylinder is a better choice if you only need thrust from one end and want a shorter overall length.
For a drop-in replacement, match the 40 mm bore, 800 mm stroke, PT port thread, and the specific SCD mounting accessory. At this 800 mm stroke, the unsupported rod extends significantly; if the load applies any side force, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
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 SCD40X800 FAQ
Because the piston rod passes through both ends, the effective pressure area is identical in both directions. The force is 528 N at 0.5 MPa, 739 N at 0.7 MPa, and reaches 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when you need equal force and speed in both directions, or when you want to use the rear rod for mounting a secondary tool, a mechanical stop, or a position sensor. The through-rod design also improves rod bearing support compared to a standard single-rod cylinder.
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