Airtac SCD Standard Cylinder SCD40X500
The AirTAC Airtac SCD Standard Cylinder SCD40X500 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, 500mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke500 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X500
The SCD40X500 is a double-acting, double-rod pneumatic cylinder where the 16 mm piston rod extends through both end caps, providing identical push and pull force of 528 N at 0.5 MPa. With a 500 mm stroke, this model is suited for transfer mechanisms or dual-sided tooling where the rear rod can carry a sensor flag or secondary stop, and the equal force output simplifies pneumatic circuit design.
This 40 mm bore cylinder features PT1/4 ports and an M12x1.25 rod thread, with an adjustable air cushion of 21 mm at each end to decelerate the piston smoothly. The retracted body length A(SCD) is 191 mm, making the overall package longer than an equivalent single-rod SC cylinder. It operates on filtered air from 0.15 to 1.0 MPa, with a maximum thrust of 950 N at 0.9 MPa in either direction.
Airtac SCD Standard Cylinder SCD40X500 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X500 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 500 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 SCD40X500
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SCD40X500 Is Used
Bidirectional Transfer Shuttles
The equal 528 N force in both directions makes the SCD40X500 ideal for shuttling parts between two stations, where consistent speed and thrust are required for both the extend and retract strokes.
Rear-Mounted Stroke Sensing
The rear rod extension provides a perfect mounting point for a sensor flag or cam, enabling end-of-stroke detection without interfering with the primary tooling on the front rod.
Non-Rotating Pusher Mechanisms
The dual-rod support offers inherent anti-rotation properties, making this cylinder suitable for simple push/pull applications where preventing the tooling from twisting is critical.
Is the Airtac SCD Standard Cylinder SCD40X500 the Right Cylinder?
Choose the SCD40X500 when you need a 500 mm stroke with balanced force output. If 528 N is insufficient, stepping up to the SCD50 bore provides 825 N at 0.5 MPa. For applications needing force in only one direction, a single-rod SC cylinder is a more compact and cost-effective choice. The through-rod design offers better guidance than a single rod, but it is not a substitute for a properly supported guided cylinder under significant side loads.
For a stroke of 500 mm, be mindful of rod buckling and bending on the unsupported rear rod. If the load is not perfectly axial, consider adding an external linear guide or switching to a guided cylinder. This model is a direct replacement for another AirTAC SCD40X500 with matching PT ports, basic mounting, and no magnet.
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 SCD40X500 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 outputs 950 N in both directions.
Choose the SCD when your application requires equal force and speed in both directions, or when you need to mount tooling, stops, or sensors on both ends of the piston rod. The through-rod also provides better bearing support than a single-rod cylinder.
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