Airtac SCD Standard Cylinder SCD250X80S
The AirTAC Airtac SCD Standard Cylinder SCD250X80S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø50mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø250mm bore, 80mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke80 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X80S
The SCD250X80S is a heavy-duty double-rod pneumatic cylinder that generates an identical 23562 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design where the 50 mm rod extends from both end caps. This symmetry eliminates force differential, making it ideal for large fixtures that require balanced, repeatable motion in both extend and retract.
With an 80 mm stroke and a substantial body length A of 435 mm, this cylinder provides a rigid, guided linear motion platform. The built-in magnet allows direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for precise end-of-stroke detection, while the adjustable air cushion at each end decelerates the massive piston smoothly within a 40 mm cushion zone.
Airtac SCD Standard Cylinder SCD250X80S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X80S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 80 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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, 40 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 (Ø250mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 23562 N | 23562 N |
| 0.7 MPa | 32987 N | 32987 N |
| Max (@1.0 MPa) | 4805 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 SCD250X80S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×80 | 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 SCD250X80S Is Used
Balanced Heavy Pressing
Delivers equal 23562 N force in both directions for large-area pressing, clamping, or forming operations where return force must match the work stroke.
Dual-Sided Stroke Sensing
The built-in magnet enables sensor mounting on the barrel, while the rear rod can carry a secondary sensor flag or cam for redundant position verification on safety-critical large-bore systems.
Symmetric Material Handling
Uses the rear rod extension to drive a secondary mechanism or counterbalance, perfect for large transfer shuttles or lifting beams that demand identical push and pull thrust.
Is the Airtac SCD Standard Cylinder SCD250X80S the Right Cylinder?
This 250 mm bore model sits at the top of the SCD range, providing 23562 N at 0.5 MPa. If your application requires less force, the SCD200X80S steps down to 15080 N at the same pressure. For applications needing a single-rod cylinder, consider the SC series, but you will lose the equal push/pull force and the ability to mount tooling or a sensor flag on the rear rod.
When replacing an existing unit, match the 250 mm bore, 80 mm stroke, PT port thread, and the integrated magnet (-S suffix). This basic mount version has no attached brackets, so ensure your existing mounting hardware is compatible. For strokes of 300 mm or more on this bore, carefully evaluate side loads on the unsupported rod; an external guide rail or a switch to a guided cylinder is strongly recommended to prevent rod bending and premature bearing wear.
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 SCD250X80S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 23562 N, at 0.7 MPa it produces 32987 N, and at the maximum operating pressure of 0.9 MPa it delivers 42412 N in both directions.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you need to mount tooling, a stop, or a sensor target on the rear rod. The through-rod also provides better support for the piston, reducing uneven bearing wear compared to a single-rod cylinder under the same conditions.
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