Airtac SCD Standard Cylinder SCD40X70
The AirTAC Airtac SCD Standard Cylinder SCD40X70 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, 70mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke70 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X70
The AirTAC SCD40X70 is a double-acting pneumatic cylinder with a through-rod that extends from both ends, guaranteeing identical push and pull force of 528 N at 0.5 MPa. This symmetry eliminates the force imbalance of a single-rod cylinder, making it ideal for applications requiring consistent motion in both directions. The 40 mm bore houses a 16 mm diameter rod, and the body length A(SCD) is a compact 191 mm.
With a 70 mm stroke, this model is well-suited for short-transfer tasks, two-sided tooling, or mounting a sensor flag on the rear rod. The adjustable air cushion at each end decelerates the piston smoothly, protecting end caps during high-cycle operation. Ports are PT1/4, and the standard TPU seal operates reliably from -20 to +70 °C.
Airtac SCD Standard Cylinder SCD40X70 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X70 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 70 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 SCD40X70
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SCD40X70 Is Used
Bidirectional Transfer
Moves a shuttle table or small component back and forth with equal speed and force, using the front rod for the load and the rear rod for a counterbalance or limit switch flag.
Dual-Sided Staking
Operates two identical press tools, one on each rod end, to perform simultaneous staking or crimping operations on opposite sides of a workpiece.
Non-Rotating Guide
The dual-rod support provides inherent anti-rotation for a mounted plate, useful for simple lifting or pushing where adding external guides is not possible.
Is the Airtac SCD Standard Cylinder SCD40X70 the Right Cylinder?
Choose the SCD40X70 when you need equal force in both directions within a compact footprint. If your load requires more thrust, consider stepping up to the SCD50 bore, which provides 825 N at 0.5 MPa. For applications where only one end of the rod needs to do work, the single-rod SC series offers a simpler and often more cost-effective solution. This double-rod design also provides better rod guidance than a standard single-rod cylinder, but it is not a replacement for a fully guided cylinder under significant side loads.
As a direct replacement part, this SCD40X70 matches any existing AirTAC SCD cylinder of the same 40 mm bore, 70 mm stroke, PT port thread, basic mounting, and no magnet. Verify that your mounting accessories, such as an FA front flange or LB foot mount, align with the SCD body dimensions before ordering.
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 SCD40X70 FAQ
Because the rod passes through both ends, the effective piston area is identical in both directions. The SCD40X70 produces 528 N of force when extending and retracting at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at the maximum operating pressure of 0.9 MPa.
Choose the SCD when your application demands equal force and speed in both directions, or when you need to mount tooling, a sensor, or a mechanical stop on the rear rod. The through-rod also provides better support for the piston, improving side-load resistance compared to a single-rod cylinder of the same bore.
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