Airtac SCJ250 Standard Cylinder SCJ250X1000-30
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-30 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-30
The SCJ250X1000-30 is a large-bore, double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. With a 250 mm bore, it delivers a substantial 24544 N of push force at just 0.5 MPa, making it suitable for heavy-duty pressing, clamping, and lifting applications where the final stop position needs fine-tuning during commissioning or changeovers.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, a 40 mm air cushion for smooth deceleration, and a 1-inch PT port. The body length A is 409 mm, and the standard stroke range extends up to 1500 mm for this bore. The stroke-adjust screw shortens the end position without altering the cylinder's fundamental force output, allowing operators to dial in the exact stroke required on the machine.
Airtac SCJ250 Standard Cylinder SCJ250X1000-30 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| 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 SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø250mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ250 Standard Cylinder SCJ250X1000-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | Nominal (maximum) stroke length in mm. |
| -30 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ250 Standard Cylinder SCJ250X1000-30 Is Used
Heavy Press Commissioning
Fine-tune the final pressing depth on a large hydraulic-style pneumatic press by adjusting the stroke end screw, ensuring consistent part compression without mechanical shimming.
Material Handling Stops
Set the precise retract or extend position for a heavy-duty stop gate on a conveyor for large pallets, allowing quick adjustment for different pallet sizes up to a 30 mm range.
Clamping System Wear Take-Up
Compensate for wear on clamp pads in a large assembly fixture over time. The 30 mm adjustment range lets operators maintain exact clamping force position without replacing the tooling.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-30 the Right Cylinder?
When selecting this cylinder, consider that the SCJ250's push force of 24544 N at 0.5 MPa is a significant step up from the SCJ200, which provides 15708 N. If your application requires even more force, a larger custom solution would be needed, as this is the largest standard bore. For applications not requiring stroke adjustability, the fixed-stroke SC250X1000 offers a simpler, more cost-effective alternative. This model is a direct dimensional replacement only for another AirTAC SCJ250X1000-30 with matching PT ports, basic mounting, and no magnet.
At a 1000 mm stroke, the extended piston rod is susceptible to side-loading and bending. It is critical to ensure the load is guided externally and that the cylinder is mounted to apply force purely axially. If external guidance is not feasible, consider using a guided cylinder or adding a separate linear guide system to protect the rod and seals from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ Required force at your working pressure
- ✓ 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 Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ250 Standard Cylinder SCJ250X1000-30 FAQ
The push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 23562 N at 0.5 MPa due to the area of the 50 mm piston rod.
No. The adjusting screw only sets the mechanical end-of-stroke position; it does not lock the piston. If air pressure is lost or the valve is centered, the cylinder will not hold its position and the load may drift. A separate mechanical lock or pilot-operated check valve is required for mid-stroke load holding.
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