Airtac SCD Standard Cylinder SCD250X300S
The AirTAC Airtac SCD Standard Cylinder SCD250X300S 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, 300mm stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Rod (both ends)Ø50 mm
- Stroke300 mm
- Port sizePT1"
- Rod configDouble rod (through)
- CushionAdjustable, 40 mm
About the Airtac SCD Standard Cylinder SCD250X300S
The SCD250X300S is a heavy-duty double-rod pneumatic cylinder that outputs an identical 23562 N of thrust in both directions at 0.5 MPa, thanks to its 50 mm through-rod subtracting the same area from each piston face. This symmetry eliminates force differentials, making it ideal for large fixtures where a rear rod extension carries tooling, a counterbalance, or external stroke sensors. With a 300 mm stroke and a 40 mm adjustable air cushion at each end, it decelerates high-inertia loads smoothly within its 30-500 mm/s speed range.
Built on a robust tie-rod construction and classified as ISO 6430 class, this 250 mm bore cylinder uses a PT1 inch port and an M42x2 rod thread. The integrated magnet, designated by the -S suffix, allows direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for non-contact position feedback. The retracted body length A(SCD) is 435 mm, providing a stable base for symmetric, two-sided actuation tasks.
Airtac SCD Standard Cylinder SCD250X300S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD250X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Rod diameter | Ø50 mm (both ends) |
| Stroke | 300 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 SCD250X300S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 250 | Bore size in mm. |
| ×300 | 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 SCD250X300S Is Used
Two-Sided Welding Fixtures
The equal push/pull force of 23562 N at 0.5 MPa lets the SCD250X300S clamp large weldments from both sides simultaneously, using the front rod for the primary clamp and the rear rod for a synchronized ejector or support anvil.
Heavy Pallet Transfer
With a 300 mm stroke and a rear rod extension, this cylinder can push a 2-tonne pallet onto a conveyor while the back end trips a DMSG sensor, confirming full extension without needing a separate flag bracket on the load.
Symmetric Press Operations
The through-rod design naturally counteracts bending moments in press-fit stations. The 50 mm rod on both ends provides inherent alignment, applying 42412 N of force at 0.9 MPa to seat bearings or bushings from either side of the part.
Is the Airtac SCD Standard Cylinder SCD250X300S the Right Cylinder?
Choose the SCD250 when your application demands balanced thrust above 20000 N in both directions. If your force requirement is closer to 15000 N, the SCD200 with its 40 mm rod delivers 15080 N at 0.5 MPa and may reduce system cost and air consumption. For tasks that only need a single working end, the standard SC single-rod cylinder is a simpler, more compact alternative. At a 300 mm stroke, the dual 50 mm rods provide substantial guidance, but any significant side load still requires an external linear guide or a dedicated guided cylinder to protect the rod bearings from premature wear.
To replace an existing unit, match all five points: 250 mm bore, 300 mm stroke, PT1 inch port thread, the SCD-specific mounting accessory (this model is basic, but FA, LB, or TC are available), and the -S magnet option for sensor compatibility. This ensures a drop-in fit with identical force and sensing behaviour.
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 SCD250X300S 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. The theoretical force at 1.0 MPa is 4805 kgf.
Select the SCD when you need perfectly balanced force and speed in both directions, or when you require a rear rod extension to mount tooling, a mechanical stop, or a sensor target. The dual rods also provide better bearing support and anti-rotation than a single-rod SC, though they are not a substitute for an external guide under high side loads.
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