The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X125-10 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, 125mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X125-10 is an ISO 6430 class double-acting single-rod cylinder with a field-adjustable stroke end, built for heavy-duty automation where fine-tuning the end position is faster than re-machining stops. Its 250 mm bore delivers a substantial 24544 N push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa, while the 50 mm diameter piston rod provides the rigidity needed for large guided tooling.
The rear-cap adjusting screw offers a 10 mm shortening range on the nominal 125 mm stroke, letting commissioning engineers dial in the exact stop point to compensate for assembly tolerances or tooling wear. The cylinder body length A is 409 mm, and it uses a 40 mm long air cushion to decelerate the high-inertia load smoothly. Standard PT 1 inch ports supply the large air volume this bore demands.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X125-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 125 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. |
| ×125 | 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 retract stop of a stamping press feeder by up to 10 mm to perfectly align heavy steel coils with the die, eliminating shim changes during setup.
Adjust the core-pull end position on a large injection mold to account for thermal expansion differences between the mold halves, ensuring consistent part wall thickness.
Use the 10 mm stroke-end adjustment on a log stop to precisely set the cut length for different timber batches, compensating for wear on the stop face without replacing parts.
Choose the SCJ250 when your application needs over 24000 N of push force at standard shop air. If the 10 mm adjustment range is insufficient for your format changes, step down to the SCJ200 bore, which provides 15708 N push at 0.5 MPa and offers adjustment ranges up to 100 mm. For applications requiring a fixed, non-adjustable stroke, the standard SC250 is a simpler alternative. This cylinder is a direct replacement for an existing AirTAC SCJ250X125-10 with PT ports and basic mounting. For strokes of 125 mm, the robust 50 mm rod handles side loads well, but for off-axis forces, consider pairing the cylinder with an external guide rail.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The maximum push force at the 0.9 MPa operating limit is 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
It is a direct dimensional match for another AirTAC SCJ250X125-10 adjustable-stroke cylinder. If you are replacing a fixed-stroke SC250, ensure the 10 mm adjustment screw does not interfere with your machine frame and that the body length A of 409 mm fits your mounting space.
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