Airtac SCD Standard Cylinder SCD125X900S
The AirTAC Airtac SCD Standard Cylinder SCD125X900S 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, 900mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke900 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X900S
The SCD125X900S is a double-acting, double-rod pneumatic cylinder where the piston rod extends from both ends, providing identical push and pull force in each direction. At 0.5 MPa, this model outputs 5734 N of thrust both ways, making it a balanced workhorse for heavy, symmetrical tooling. The 32 mm diameter rod runs through both caps, and the adjustable air cushion (28 mm length) decelerates the 900 mm stroke smoothly.
This SCD125X900S includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise, non-contact position feedback. With a body length A of 291 mm and a maximum standard stroke of 1500 mm, this cylinder is built on a robust tie-rod construction. It operates on filtered air from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, and uses a default PT1/2 port.
Airtac SCD Standard Cylinder SCD125X900S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X900S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 900 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 SCD125X900S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SCD125X900S Is Used
Two-Sided Transfer Shuttle
The equal 5734 N force and speed in both directions, combined with a 900 mm stroke, makes this ideal for heavy shuttle tables that move pallets or fixtures between two parallel conveyor lines, with tooling mounted on both rod ends.
Non-Rotating Pusher for Hot Parts
The through-rod provides excellent anti-rotation guidance for a pusher plate, ensuring it stays square when ejecting formed parts from a press. The 900 mm stroke clears the tooling area completely for part removal.
Synchronized Press-Frame Actuation
With a rear rod extension, a mechanical linkage or a secondary sensor flag can be attached to synchronize a safety gate or confirm full retraction, leveraging the 5734 N of balanced force at 0.5 MPa for reliable press operation.
Is the Airtac SCD Standard Cylinder SCD125X900S the Right Cylinder?
The SCD125 is a high-force double-rod option; if your application needs more thrust, the SCD160 steps up to 9425 N at 0.5 MPa, while the SCD100 provides a more compact 3681 N for lighter tasks. Choose this double-rod design when you need to mount tooling, a stopper, or a sensor flag on the rear rod, or when the inherent anti-rotation and better rod guidance of a through-rod are required. For a simple push-only task, the single-rod SC125 is a more economical choice.
At a 900 mm stroke, the long, unsupported 32 mm rod is susceptible to side loading and bending. You must guide the external load with a separate linear rail or switch to a guided cylinder if significant radial forces are present. For a drop-in replacement, match an AirTAC SCD125 of the same 900 mm stroke, PT port thread, basic mounting, and the -S magnet option for sensor compatibility.
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 SCD125X900S FAQ
Because it's a double-rod cylinder, the effective piston area is the same on both sides. The push and pull forces are identical: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at the maximum operating pressure of 0.9 MPa. The theoretical force at 1.0 MPa is 1169 kgf.
You would select the SCD when you need to attach tooling, a mechanical stop, or a position-sensing flag to the rear rod, or when the better rod guidance and anti-rotation properties of a through-rod are required for your application. It also provides perfectly equal force and speed in both directions, which is critical for symmetric processes that a single-rod cylinder cannot match.
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