Airtac SCD Standard Cylinder SCD40X120
The AirTAC Airtac SCD Standard Cylinder SCD40X120 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, 120mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke120 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X120
The SCD40X120 is a double-acting, double-rod pneumatic cylinder that outputs an identical 528 N of force in both directions at 0.5 MPa, thanks to its through-rod design where the 16 mm rod subtracts the same area from each piston face. This symmetry eliminates force imbalance, making it ideal for tasks where a consistent push and pull stroke is required, such as operating a two-sided scraper or a transfer mechanism that must return with the same authority.
With a 120 mm stroke and a compact body length A of 191 mm, this 40 mm bore cylinder fits into tight spaces while providing a rear rod extension that can carry a limit switch dog, a manual override knob, or secondary light tooling. The adjustable air cushion at each end, with a 21 mm cushion length, decelerates the piston smoothly, protecting end-cap components during high-cycle operation.
Airtac SCD Standard Cylinder SCD40X120 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X120 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 120 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 SCD40X120
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SCD40X120 Is Used
Bidirectional Transfer Shuttles
The equal push and pull force of 528 N at 0.5 MPa ensures a shuttle table moves with the same speed and power in both directions, preventing the lag often seen with single-rod cylinders on the return stroke.
Rear-Mounted Stroke Sensing
The protruding rear rod provides a convenient mounting point for a sensor flag or cam, allowing end-of-stroke detection on the cap-end side without adding brackets to the cylinder body.
Two-Sided Cleaning or Scraping
Mount a blade or brush on each rod end to clean or scrape two parallel surfaces in one cycle, leveraging the through-rod's ability to apply working force at both ends of the cylinder simultaneously.
Is the Airtac SCD Standard Cylinder SCD40X120 the Right Cylinder?
Step up to the SCD50 (825 N at 0.5 MPa) if your application needs more force, or down to the SCD32 (345 N) for a lighter, more compact actuator. If you only need force from one end, a single-rod SC40 cylinder provides a higher push force because the full bore area is available on the outstroke. For applications where the 120 mm stroke creates a risk of rod deflection under side load, consider adding an external linear guide or switching to a guided cylinder, as the dual-rod design improves guidance but does not eliminate bending moments on the unsupported rod ends.
To replace an existing SCD40X120, match the 40 mm bore, 120 mm stroke, PT port thread, and basic mounting style. If your current unit has a magnet, specify the -S suffix for sensor compatibility.
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 SCD40X120 FAQ
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it produces 528 N, at 0.7 MPa it produces 739 N, and at the maximum operating pressure of 0.9 MPa it produces 950 N in both directions.
Choose the SCD40 when you need identical force and speed in both directions, or when you need a rear rod extension to mount tooling, a stopper, or a sensor flag. If you only need maximum push force in one direction and have no use for the rear rod, the single-rod SC40 will be more cost-effective and provide a higher push force.
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