Airtac SCD Standard Cylinder SCD125X40
The AirTAC Airtac SCD Standard Cylinder SCD125X40 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 40mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke40 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X40
The SCD125X40 is a double-acting, double-rod pneumatic cylinder providing a perfectly symmetrical 5734 N of force in both directions at 0.5 MPa, thanks to its through-rod design. With a 125 mm bore and a 32 mm rod extending from both ends, it offers inherent anti-rotation and the ability to mount tooling or sensors on the rear rod.
This 40 mm stroke model is built on a robust tie-rod construction with a body length (A) of 291 mm and an adjustable air cushion of 28 mm at each end for smooth deceleration. Operating on filtered air from 0.15 to 1.0 MPa, it uses PT1/2 ports and is part of the ISO 6430 class for larger bore cylinders.
Airtac SCD Standard Cylinder SCD125X40 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X40 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 40 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 28 mm |
| Max stroke | Up to 1500 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 (Ø125mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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 SCD125X40
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SCD125X40 Is Used
Dual-Sided Actuation
The through-rod design allows a tool or fixture to be mounted on both ends of the cylinder, enabling a single actuator to perform work in two separate stations simultaneously with perfectly synchronized motion.
Anti-Rotation Pusher
The dual-rod support provides superior guidance compared to a single-rod cylinder, making it ideal for pushing or pressing applications where the rod must resist twisting without a dedicated external guide.
Rear Stroke Sensing
Mount a sensor flag or a secondary position indicator on the rear rod extension to provide a direct, mechanical readout of the piston's position, simplifying setup and verification in automated cells.
Is the Airtac SCD Standard Cylinder SCD125X40 the Right Cylinder?
Select the SCD125X40 when your application demands equal push and pull thrust of 5734 N at 0.5 MPa. If you need more force, stepping up to the SCD160 bore provides 9425 N at the same pressure. For applications requiring only a single working direction, the standard SC single-rod series offers a simpler, more compact solution. This double-rod cylinder is a direct replacement only for another AirTAC SCD125 cylinder matching the 40 mm stroke, PT port thread, and basic mounting style.
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 SCD125X40 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa, it produces 5734 N; at 0.7 MPa, 8028 N; and at the maximum operating pressure of 0.9 MPa, it delivers 10321 N of thrust in both directions.
Choose the SCD double-rod type when you need equal force and speed in both directions, or when you need to utilize the rear rod extension for mounting a bracket, stopper, or sensor flag. The dual-rod support also provides better resistance to side loads and rod rotation than a single-rod cylinder.
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