The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-10 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, 25mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X25-10 is a large-bore, double-acting single-rod cylinder that puts field-adjustable stroke control directly on the machine. Its rear-cap screw lets you fine-tune the stroke end by up to 10 mm, so a nominal 25 mm stroke can be dialed back precisely during commissioning or format changes without swapping the cylinder. With a 50 mm rod and PT1" ports, this ISO 6430 class tie-rod actuator delivers 24544 N of push force at just 0.5 MPa.
Built for heavy-duty applications, the SCJ250X25-10 uses an adjustable air cushion (40 mm length) to decelerate the piston smoothly. The body length A(SCJ) is 409 mm, and the cylinder operates reliably from -20 to +70 °C with its standard TPU seals. The adjustable screw sets only the stroke end position—it does not alter the bore's force output or maximum speed rating of 30-500 mm/s.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Dial in the final pressing depth on a large forming press during die setup, using the 10 mm adjustment screw to achieve exact part dimensions without mechanical shims.
Fine-tune the closing position of a heavy-duty welding or assembly fixture, compensating for part tolerance stack-up with the adjustable stroke end to ensure consistent clamp force.
Adjust the retracted position of a large material stopper gate on a conveyor line to compensate for wear on the gate pad, maintaining reliable product singulation over time.
Choose the SCJ250X25-10 when you need the highest force class in the SCJ range and a short, field-trimmable stroke. If 24544 N push at 0.5 MPa is more than your load requires, stepping down to the 200 mm bore reduces push force to 15708 N. For applications needing a fixed, non-adjustable stroke, the standard SC250 series is a simpler alternative. A direct replacement must match the 250 mm bore, 25 mm nominal stroke, 10 mm adjust range, PT port thread, and basic mounting. For strokes of 300 mm or more, always evaluate side-load and rod bending; an external guide or guided cylinder is recommended.
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 theoretical force at 1.0 MPa is 5006 kgf. Push force is always greater than pull force because this is a single-rod cylinder.
A screw in the rear cap sets the stroke end position within a 10 mm range. The nominal 25 mm stroke is the maximum; you can shorten it by up to 10 mm. This is a mechanical stroke-end stop, not a force or speed adjuster, and it does not lock the piston rod in place when air pressure is removed.
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