Airtac SCD Standard Cylinder SCD250X700
The AirTAC Airtac SCD Standard Cylinder SCD250X700 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, 700mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke700 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X700
The SCD250X700 is a heavy-duty double-rod pneumatic cylinder that outputs an identical 23562 N of force in both directions at 0.5 MPa, rising to 42412 N at the maximum operating pressure of 0.9 MPa. Its 50 mm diameter rod passes completely through both end caps, providing a robust rear connection point for mounting external stroke sensors, cams, or a secondary tooling plate, while inherently improving bearing support and resisting piston rod rotation.
This ISO 6430 class tie-rod cylinder has a 700 mm stroke, well within its 1500 mm maximum standard limit, and uses a 1-inch PT port for high flow. The adjustable air cushion at each end, with a generous 40 mm cushion length, effectively decelerates large inertial loads. The body length A is a substantial 435 mm, and the retracted overall length is considerably longer than a single-rod equivalent, a key factor for machine layout planning.
Airtac SCD Standard Cylinder SCD250X700 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X700 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 700 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 SCD250X700
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×700 | 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 SCD250X700 Is Used
Reciprocating Shuttle Tables
The equal force and speed in both directions ensures perfectly symmetrical motion for heavy transfer shuttles, eliminating timing discrepancies between the forward and return strokes.
Dual-Sided Bending & Forming
A tool can be mounted on each rod end to perform a two-stage forming operation, or the rear rod can drive a synchronized ejector mechanism, all powered by a single cylinder.
Non-Rotating Lifting Gantry
The dual-rod design provides inherent anti-rotation, making it suitable for a vertical lifting beam on a gantry where a single rod would require an external guide to prevent twisting.
Is the Airtac SCD Standard Cylinder SCD250X700 the Right Cylinder?
For a 700 mm stroke application, the SCD250's 50 mm rod provides excellent column strength, but the long unsupported extension still warrants an external guide rail or a switch to a guided cylinder if significant side loads are present. If the 23562 N force at 0.5 MPa exceeds your requirement, stepping down to the SCD200 bore reduces the force to 15080 N, while still using a robust 40 mm through rod. A single-rod SC series cylinder is a simpler, more compact choice if you only need a force output from one end and can accept unequal push/pull forces.
This is a direct replacement for any AirTAC SCD250 double-rod cylinder with a 700 mm stroke, 1-inch PT ports, and basic mounting. To match an existing unit, verify the bore, stroke, port thread type, and the specific mounting accessory code. Adding a suffix like '-S' for a magnetic piston enables use with CMSG/DMSG sensors for non-contact position feedback.
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 SCD250X700 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. The force is 23562 N at 0.5 MPa, 32987 N at 0.7 MPa, and 42412 N at the maximum operating pressure of 0.9 MPa. The theoretical force at 1.0 MPa is 4805 kgf.
Choose the SCD when you need equal force and speed in both directions, or when you require a rear rod extension to mount a limit switch cam, a secondary tool, or a brake. The through-rod design also provides better guidance and anti-rotation than a single-rod cylinder, but it is physically longer and is not a substitute for a fully guided cylinder under high side loads.
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