Airtac SCD Standard Cylinder SCD80X125S
The AirTAC Airtac SCD Standard Cylinder SCD80X125S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø25mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø80mm bore, 125mm stroke, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Rod (both ends)Ø25 mm
- Stroke125 mm
- Port sizePT3/8
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD80X125S
The SCD80X125S delivers identical thrust in both directions—2268 N at 0.5 MPa and up to 4082 N at 0.9 MPa—thanks to its through-rod design where the 25 mm rod passes through both end caps. This symmetry eliminates force differentials, making it ideal for two-sided tooling, transfer shuttles, or any application where the return stroke must match the working stroke precisely. The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for reliable, non-contact end-of-stroke sensing.
At 125 mm of stroke, this double-rod cylinder stays well within the 1500 mm maximum standard stroke for the 80 mm bore. The body length A(SCD) is 257 mm, and the adjustable pneumatic cushion at each end (28 mm long) decelerates the piston smoothly, protecting the end caps and external tooling. With PT3/8 ports and an M20x1.5 rod thread, it integrates into standard pneumatic circuits while the double rod provides better bearing support than a single-rod cylinder of the same size.
Airtac SCD Standard Cylinder SCD80X125S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD80X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø80 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 125 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 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 (Ø80mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2268 N | 2268 N |
| 0.7 MPa | 3175 N | 3175 N |
| Max (@1.0 MPa) | 463 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 SCD80X125S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 80 | 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 SCD80X125S Is Used
Two-Sided Actuation
The through-rod design provides equal force and speed in both directions, perfect for operating two fixtures or clamps from opposite ends of the cylinder simultaneously.
Rear-Mounted Stroke Sensing
With the built-in -S magnet, a CMSG or DMSG sensor can be mounted on the rear barrel to confirm retraction, keeping the front rod area clear for tooling and improving cycle time verification.
Transfer Shuttles
The equal push/pull force of 2268 N at 0.5 MPa ensures a smooth, balanced motion for shuttling parts between two conveyor lines, preventing jerky starts in either direction.
Is the Airtac SCD Standard Cylinder SCD80X125S the Right Cylinder?
Choose the SCD80 bore when your load requires roughly 2268 N of force at 0.5 MPa in both directions. If you can accept a lower force, stepping down to the SCD63 (1402 N at 0.5 MPa) reduces air consumption and physical size. For higher force, the SCD100 delivers 3681 N at the same pressure. Remember that a double-rod cylinder is the correct choice when you need to mount tooling or a sensor flag on the rear rod, or when the application benefits from equal push/pull speed and force. If you only need force from one end, the single-rod SC series is a lighter, more compact alternative.
To replace an existing SCD80X125S, match the 80 mm bore, 125 mm stroke, PT3/8 port thread, basic mounting, and the -S magnet option. This model does not include a mounting bracket; if you need to pivot the cylinder, order the TC centre trunnion and TCM1 bracket separately (F-SC80TC). For strokes over 300 mm on this bore, evaluate the unsupported rod length for buckling and consider an external guide rail to protect the rod bearings from side load.
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 SCD80X125S FAQ
Because the 25 mm rod extends through both ends, the effective piston area is identical on both sides. The force is 2268 N at 0.5 MPa, 3175 N at 0.7 MPa, and 4082 N at the maximum operating pressure of 0.9 MPa. The theoretical force at 1.0 MPa is 463 kgf.
Choose the SCD when you need equal force and speed in both directions, or when you need to attach a load, stopper, or sensor flag to the rear rod. The double rod also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a substitute for a fully guided cylinder under high side loads.
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