Airtac SCD Standard Cylinder SCD80X250S
The AirTAC Airtac SCD Standard Cylinder SCD80X250S 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, 250mm stroke, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Rod (both ends)Ø25 mm
- Stroke250 mm
- Port sizePT3/8
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD80X250S
The SCD80X250S is an 80 mm bore double-rod pneumatic cylinder that delivers identical push and pull force in both directions because the 25 mm rod passes through both end caps, subtracting the same area on each side. At a standard 0.5 MPa supply, it produces 2268 N of thrust each way, rising to 4082 N at the 0.9 MPa maximum operating pressure, making it a balanced workhorse for symmetrical linear tasks.
This model carries the -S suffix, so a built-in magnet band is fitted on the piston, allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The 250 mm stroke sits well within the 1500 mm maximum for this bore, and the adjustable air cushion at each end (28 mm long) decelerates the piston smoothly. The rear rod extension is often used to mount a secondary tool, a hard stop, or a sensor flag.
Airtac SCD Standard Cylinder SCD80X250S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD80X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø80 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 250 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 SCD80X250S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SCD80X250S Is Used
Two-Sided Transfer Shuttles
The identical push and pull force of the SCD80X250S makes it ideal for shuttle tables where a fixture is moved between two stations with equal acceleration and deceleration in both directions.
Rear-Mounted Stroke Sensing
With the built-in magnet and the rear rod extension, a DMSG sensor can be mounted on the back of the cylinder to confirm the piston's position, keeping the front tooling area clear of sensor brackets.
Symmetric Clamping & Pressing
Use the front rod for a press tool and the rear rod for a counter-support or a visual stroke indicator, ensuring the 2268 N clamping force at 0.5 MPa is applied evenly without twisting the piston rod bearings.
Is the Airtac SCD Standard Cylinder SCD80X250S the Right Cylinder?
Choose the SCD80 when you need the equal bi-directional force of a through-rod design in the 2000-4000 N range. If your load requires less thrust, stepping down to the SCD63 bore (1402 N at 0.5 MPa) saves space and air consumption. For higher force, the SCD100 bore provides 3681 N at the same pressure. This double-rod cylinder is the right pick when you need to attach tooling or position feedback on the rear rod; if you only need force from one end, the simpler single-rod SC80 series is a more compact alternative.
At a 250 mm stroke, rod deflection under side load is generally not a concern for purely axial pushes, but if the tooling on either rod end introduces a bending moment, pair the cylinder with an external linear guide. For direct replacement, match the 80 mm bore, 250 mm stroke, PT port thread, basic mounting style, and the -S magnet option of this SCD80X250S.
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 SCD80X250S FAQ
Because it is a double-rod cylinder, the push and pull forces are equal. At 0.5 MPa it outputs 2268 N, at 0.7 MPa it is 3175 N, and at the maximum operating pressure of 0.9 MPa it reaches 4082 N. The theoretical force at 1.0 MPa is 463 kgf.
Choose the SCD80 when you need identical speed and force in both directions, or when you need to use the rear rod extension for mounting a secondary tool, a mechanical stop, or a position sensor flag. The through-rod design also provides better guidance and resistance to rod rotation than a single-rod cylinder, though it is not a substitute for an external guide under heavy side loads.
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