The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X400-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 400mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X400-10 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing up to 10mm of fine-tuning via a rear-cap screw. With a 250mm bore and 50mm piston rod, it delivers a powerful 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty industrial positioning where the final stroke length must be dialled in precisely during setup.
This ISO 6430 class tie-rod cylinder features a 400mm nominal stroke, adjustable air cushioning, and a PT1 inch port. The body length A(SCJ) is 409mm, and the unit operates reliably within a -20 to +70°C temperature range using its standard TPU seals.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X400-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 10 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Fine-tune the final pressing depth on a large hydraulic-style pneumatic press by adjusting the stroke end within a 10mm window during commissioning, without re-machining tooling.
On a high-cycle structural clamping fixture, the 10mm adjustment can be used periodically to compensate for pad wear, maintaining consistent clamping force without replacing the cylinder.
Set the precise end position of a heavy material-handling diverter gate. The adjustable screw allows operators to quickly correct the gate's alignment with a chute after installation.
Choose the SCJ250 when your application demands the highest force class in the SCJ range, with 24544 N of push at 0.5 MPa. If this force is excessive, stepping down to a 200mm bore reduces push force to 15708 N. The 10mm adjustment range is ideal for taking up minor mechanical tolerances or wear on large-scale tooling. For applications requiring a fixed, non-adjustable stroke, the standard SC250 cylinder is the direct alternative. A replacement must match the 250mm bore, 400mm nominal stroke, 10mm adjustment range, and PT port thread. At 400mm of stroke, ensure the rod is supported with an external guide if significant side loads are present to prevent bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
Yes, if you need the ability to fine-tune the stroke end. The SCJ250X400-10 has the same bore, rod diameter, and port size as an SC250. Ensure the 10mm adjustment range meets your needs and that the slightly longer body length A(SCJ) of 409mm fits your mounting space.
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