Airtac SCD Standard Cylinder SCD40X700
The AirTAC Airtac SCD Standard Cylinder SCD40X700 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, 700mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke700 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X700
The AirTAC SCD40X700 is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, delivering an identical 528 N of thrust in each direction at 0.5 MPa. With a 40 mm bore and a 700 mm stroke, it uses a 16 mm diameter rod on both sides, subtracting the same area from each chamber so the push and pull forces are perfectly symmetrical. This balanced output makes it a strong candidate for transfer mechanisms or dual-sided tooling that must move with consistent speed and force in both directions.
This 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 tie-rod construction provides a robust body, with a base body length A(SCD) of 191 mm. Because the rod protrudes from the rear cap, you can mount a sensor flag or a secondary tool directly on the back side, simplifying stroke confirmation without adding external brackets.
Airtac SCD Standard Cylinder SCD40X700 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X700 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 700 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 SCD40X700
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SCD40X700 Is Used
Dual-Sided Transfer Shuttle
The through-rod allows tooling to be mounted on both ends, enabling a single cylinder to shuttle parts between two parallel conveyor lanes with perfectly synchronized motion.
Symmetrical Clamping Fixture
Delivers 950 N of clamping force at 0.9 MPa from both rod ends simultaneously, ideal for a fixture that must center and clamp a workpiece from two opposite sides with equal pressure.
Rear-Mounted Stroke Sensing
The rear rod extension provides a clean, accessible surface to attach a sensor flag or cam, allowing end-of-stroke detection without interfering with the primary tooling on the front rod.
Is the Airtac SCD Standard Cylinder SCD40X700 the Right Cylinder?
Select the SCD40X700 when your application requires equal force and speed for both the extend and retract strokes, and you can make use of the rear rod end for a cam, stopper, or sensor target. If you need higher thrust, stepping up to the SCD50 bore provides 825 N at the same 0.5 MPa pressure, but with a larger 20 mm rod. If your load only needs to be pushed in one direction and the rear rod is unused, the single-rod SC40 series is a simpler, more compact alternative.
For a 700 mm stroke, be mindful of the unsupported rod length when the cylinder is fully extended. While the double-rod design offers better guidance than a single rod, it is not immune to side loading. If the rod tips are not rigidly guided by external tooling, consider adding an external linear guide to prevent rod bending and premature seal wear. A direct replacement must match the 40 mm bore, 700 mm stroke, PT1/4 ports, basic mounting, and the SCD double-rod 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 SCD40X700 FAQ
The push and pull forces are identical because it is a double-rod cylinder. 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 delivers 950 N of force in both directions.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you need to mount a tool, stopper, or sensor target on the rear rod. The double-rod design also provides better support for the piston rod, reducing deflection compared to a single-rod cylinder of the same stroke, though it is not a substitute for an externally guided cylinder under significant side loads.
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