The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-10S 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 SCJ250X25-10S is a double-acting, single-rod tie-rod cylinder with a rear adjusting screw that provides up to 10 mm of field-adjustable stroke-end reduction. With a 250 mm bore generating 24544 N of push force at 0.5 MPa, it is built for heavy industrial positioning tasks where the final stop point must be dialed in precisely on the machine. The 50 mm piston rod and 40 mm air cushion work together to handle substantial end-of-stroke energy.
A built-in magnet is integrated into the piston, allowing CMSG, DMSG, or EMSG solid-state and reed sensors to be mounted directly on the barrel for reliable end-of-stroke sensing. This model uses the standard PT port thread and TPU seals, operating from -20 to +70 °C. The body length A(SCJ) is 409 mm, and the cylinder is part of the ISO 6430 class for large bores.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-10S |
|---|---|
| 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.
The 10 mm adjustment screw lets technicians fine-tune the final pressing depth on a 250-bore platen press without dismounting the cylinder, compensating for tooling wear or material thickness changes.
Adjust the stroke end to set the precise open or closed position of a heavy material-handling gate, ensuring a perfect seal or clearance each time a product format changes.
During the setup of a large welding or assembly fixture, the adjustable stroke allows for quick, on-the-fly changes to the clamping cylinder's end position to achieve the correct part alignment.
Select the SCJ250X25-10S when you need a high-force, short-stroke actuator with the ability to fine-tune the retracted or extended stop position by up to 10 mm during commissioning. If the force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC250 cylinder is the direct alternative. A replacement must match the 250 mm bore, 25 mm nominal stroke, 10 mm adjust range, PT port, and the -S magnet option. For strokes of 300 mm or more, evaluate the rod's side-load capacity and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa 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. The force is identical to a fixed-stroke SC250 cylinder.
A rear-cap screw mechanically limits the piston's stroke end within a 10 mm range from the nominal 25 mm stroke. It only sets the stop point and does not lock the piston. If the load must be held without air pressure, an external rod lock or pilot-operated check valve is required.
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