Airtac SCD Standard Cylinder SCD250X800S
The AirTAC Airtac SCD Standard Cylinder SCD250X800S 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, 800mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke800 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X800S
The SCD250X800S is a large-bore double-rod pneumatic cylinder engineered for heavy-duty applications that demand identical force and speed in both directions. With a 250 mm bore and a 50 mm rod passing through both end caps, it generates a substantial 23562 N of thrust each way at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa. This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for precise, non-contact end-of-stroke detection.
The 800 mm stroke is well within the 1500 mm maximum standard stroke for this bore, making it a stock-configurable unit. The cylinder body length A(SCD) is 435 mm, and the adjustable air cushion at each end is 40 mm long, providing effective deceleration for high-inertia loads. As an ISO 6430 class tie-rod cylinder, it is suited for demanding industrial environments where a through-rod design offers superior guidance and the ability to mount tooling or flags on the rear rod end.
Airtac SCD Standard Cylinder SCD250X800S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X800S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 800 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 SCD250X800S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×800 | 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 SCD250X800S Is Used
Heavy Two-Sided Tooling
Mounts a platen on the front rod and a counterweight or secondary tool on the rear rod, keeping the force balanced and the bearings symmetrically loaded during every cycle.
Large Transfer Shuttles
Pushes and pulls a heavy shuttle table with equal 23.5 kN force at 0.5 MPa, ensuring consistent acceleration and deceleration in both travel directions on a production line.
Rear-Mounted Position Sensing
The built-in magnet works with barrel-mounted sensors, while the rear rod extension provides a perfect attachment point for an external flag or a secondary sensor cam.
Is the Airtac SCD Standard Cylinder SCD250X800S the Right Cylinder?
Select the SCD250 when your application requires balanced, high-force actuation from both ends of the piston rod. If your force requirement is lower, stepping down to the SCD200 bore reduces the output to 15080 N at 0.5 MPa, which may suffice for lighter tooling while saving on air consumption. This double-rod design is ideal for tasks needing a rear connection point, but it is not a substitute for a fully guided cylinder; any significant side load on the 800 mm extended rod must be managed with an external linear guide. For a direct replacement, match the 250 mm bore, 800 mm stroke, PT port thread, basic mounting style, and the integrated magnet option exactly.
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 SCD250X800S FAQ
Because the piston rod extends through both ends of the cylinder, the effective pressure area is identical in both directions. The force is 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and reaches 42412 N at the maximum operating pressure of 0.9 MPa for both the push and pull stroke.
Choose the SCD when you need perfectly equal force and speed in both directions, or when you require a rear rod extension to mount tooling, a mechanical stop, or a sensor flag. The through-rod also provides better support for the piston, reducing uneven bushing wear compared to a single-rod cylinder in applications with frequent cycling.
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