Airtac SCD Standard Cylinder SCD40X125S
The AirTAC Airtac SCD Standard Cylinder SCD40X125S 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X125S
The SCD40X125S is a double-acting, double-rod pneumatic cylinder that provides identical thrust in both directions—528 N at 0.7 MPa—because the 16 mm rod passes through both end caps. This symmetry is ideal for applications where a tool or sensor flag must be mounted on the rear rod, or where balanced speed control is critical.
This model includes a built-in magnet (suffix -S), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. With a 125 mm stroke and a body length A of 191 mm, it fits compact dual-actuation stations. The adjustable air cushion at each end decelerates the piston smoothly over the final 21 mm of travel.
Airtac SCD Standard Cylinder SCD40X125S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 125 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 SCD40X125S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SCD40X125S Is Used
Two-Sided Transfer Shuttle
The through-rod design lets you mount a workpiece carrier on the front rod and a counterbalance or second tool on the rear, moving both simultaneously with equal force for balanced material transfer.
Rear-Mounted Stroke Sensing
With the integrated magnet, a DMSG sensor on the rear rod end confirms full retraction, keeping the front tooling area clear and simplifying cable routing on automated pick-and-place units.
Synchronized Dual-Action Clamping
The equal push-pull force of 528 N at 0.7 MPa lets this cylinder power two opposing clamp arms from a single body, ensuring symmetrical grip pressure on both sides of a fixture.
Is the Airtac SCD Standard Cylinder SCD40X125S the Right Cylinder?
Choose the SCD40 bore when your application needs roughly 528 N of force each way at standard plant pressure. If you can accept a slightly larger footprint for a meaningful force increase, the SCD50 delivers 1154 N at the same 0.7 MPa. For tasks that only need push force and a rear rod is unnecessary, the single-rod SC series is a lighter and more cost-effective alternative. To replace an existing SCD40X125S, match the 40 mm bore, 125 mm stroke, PT port thread, basic mounting, and the -S magnet option; an SCD cylinder from another brand will not share the same mounting hole pattern or tie-rod spacing.
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 SCD40X125S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. 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 an SCD when you need equal force and speed in both directions, or when you require a rear rod extension to mount a limit switch dog, a secondary tool, or a manual adjustment knob. The through-rod also provides better guidance than a single-rod cylinder, though it is not a replacement for a fully guided actuator under high side loads.
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