Airtac SCD Standard Cylinder SCD250X175
The AirTAC Airtac SCD Standard Cylinder SCD250X175 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, 175mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke175 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X175
The SCD250X175 is a heavy-duty double-rod pneumatic cylinder that generates an identical 23562 N of thrust in both extend and retract strokes at 0.5 MPa, rising to 42412 N at the maximum 0.9 MPa operating pressure. Its 50 mm diameter rod passes completely through both end caps, creating a symmetric force profile that is ideal for large tooling plates, equal-duty bidirectional presses, and applications where a rear rod extension can mount a limit switch dog or secondary cam.
This ISO 6430 class tie-rod cylinder features a 40 mm adjustable air cushion at each end to decelerate the 175 mm stroke's substantial moving mass. The body length A(SCD) is 435 mm, and the G1 inch ports supply the high flow needed for the 30-500 mm/s speed range. Operating on filtered air from 0.15 to 1.0 MPa, the standard TPU seals provide reliable service from -20 to +70 °C.
Airtac SCD Standard Cylinder SCD250X175 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X175 |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 175 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 SCD250X175
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×175 | 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 SCD250X175 Is Used
Bidirectional Pressing
The equal 23562 N force in both directions makes this cylinder perfect for two-sided pressing, clamping, or riveting operations where the work must be done on both the advance and return strokes.
Rear Stroke Sensing
The protruding rear rod provides an excellent mounting point for external limit switches, encoder flags, or a mechanical stop, enabling full stroke confirmation without sensor brackets on the main tooling.
Heavy Shuttle Tables
With 42.4 kN of thrust at 0.9 MPa, this cylinder can drive a heavy transfer shuttle or lift table, where the symmetric rod guidance helps maintain alignment under the high inertial loads of a 175 mm stroke.
Is the Airtac SCD Standard Cylinder SCD250X175 the Right Cylinder?
For applications needing the 23.5 kN force class at 0.5 MPa, this 250 mm bore model is the top of the standard SCD range. If your load requires less force, stepping down to the SCD200X175 reduces the output to 15080 N at the same pressure, offering a more compact and energy-efficient package. Conversely, if you need a single-rod cylinder for a simpler push-only task, the SC250 series provides a higher push force from the full piston area but with asymmetric pull force.
At a 175 mm stroke, rod bending under side load is less of a concern than on longer strokes, but the dual-rod design still provides superior bearing support compared to a single-rod cylinder. To replace this unit, match the 250 mm bore, 175 mm stroke, PT port thread, and basic mounting. For position sensing, order the -S magnet variant to use clamp-on CMSG or DMSG sensors on the tie-rod barrel.
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 SCD250X175 FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At the standard 0.5 MPa operating pressure, it outputs 23562 N. At 0.7 MPa, the force is 32987 N, and at the maximum 0.9 MPa, it reaches 42412 N. The theoretical force at 1.0 MPa is 4805 kgf.
Choose the SCD250 when you need perfectly equal force and speed in both directions, or when you need to attach tooling, a sensor flag, or a mechanical stop to a rear rod extension. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder, though it is not a substitute for an external guide system under high side loads.
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