Airtac SCD Standard Cylinder SCD125X90S
The AirTAC Airtac SCD Standard Cylinder SCD125X90S 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, 90mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke90 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X90S
The SCD125X90S is a double-acting, double-rod pneumatic cylinder that outputs an identical 5734 N of force in both the extend and retract strokes at 0.5 MPa, thanks to its through-rod design. With a 32 mm rod protruding from both ends, it provides symmetric thrust for tasks where tooling or a position flag must be mounted on the rear rod, and the built-in magnet lets you clamp CMSG/DMSG sensors directly onto the tie-rod barrel for reliable end-of-stroke detection.
This 125 mm bore model operates at pressures from 0.15 to 1.0 MPa and uses a 28 mm adjustable air cushion to decelerate the piston quietly at each end. The body length A(SCD) is 291 mm, making the overall retracted length longer than a comparable single-rod cylinder, and the PT1/2 port supplies ample flow for speeds up to 500 mm/s within the ISO 6430 class envelope.
Airtac SCD Standard Cylinder SCD125X90S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X90S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 90 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 SCD125X90S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SCD125X90S Is Used
Two-Sided Transfer Shuttles
The rear rod can carry a second tooling plate or a counterbalance weight, allowing the SCD125X90S to shuttle parts between two stations with perfectly matched extend and retract force profiles.
Rear-Mounted Stroke Sensing
With the built-in magnet and a rear rod extension, you can mount a sensor flag or a secondary cam on the back side of the cylinder, keeping the front work area clear while still capturing position data via DMSG switches.
Symmetric Clamping & Pressing
The equal 5734 N output in both directions makes this cylinder ideal for clamping fixtures where the tooling must apply the same force when engaging and retracting, preventing part distortion from asymmetric loads.
Is the Airtac SCD Standard Cylinder SCD125X90S the Right Cylinder?
Choose the SCD125 bore when your application needs roughly 5700 N of balanced force in both directions at standard plant air pressure. If you can work with less thrust, stepping down to the SCD100 bore saves space and weight while still providing 3681 N at 0.5 MPa. For tasks that only require force from one side, a single-rod SC series cylinder is a simpler, lower-cost alternative, but you lose the rear rod access and the perfectly equal push/pull force that defines this double-rod unit.
This SCD125X90S is a direct replacement for another AirTAC SCD125 double-rod cylinder matching the 90 mm stroke, PT1/2 ports, basic mounting, and the -S magnet option. The 90 mm stroke is well within the 1500 mm maximum for this bore, so rod bending is not a primary concern, but always avoid applying direct side loads to the exposed rod ends—use an external guide or a guided cylinder if your tooling creates a bending moment.
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 SCD125X90S FAQ
Because the piston rod passes through both end caps, the effective pressure area is identical on both sides. At 0.5 MPa the force is 5734 N in both directions; at 0.7 MPa it is 8028 N; and at the maximum operating pressure of 0.9 MPa it reaches 10321 N.
A double-rod cylinder gives you equal force and speed in both directions, which is impossible with a single rod. The rear rod extension also provides a mounting point for external stops, sensor flags, or secondary tooling, and the dual-rod bearing support offers better resistance to side loads than a single-rod design of the same bore.
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