The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X50-20S is a heavy-duty double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at 0.5 MPa. The rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting commissioning engineers fine-tune the piston stop position on large-scale equipment without dismounting the cylinder or adding external hard stops.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod and a PT 1 inch port for high flow. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for reliable end-of-stroke detection, while the 40 mm air cushion decelerates the high-inertia load smoothly.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -20 | 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 end-of-stroke position on a 250-bore press by up to 20 mm during commissioning, ensuring consistent part compression without reprogramming the PLC or changing tooling.
Use the built-in magnet and CMSG sensors to confirm full clamp engagement on structural steel assemblies, while the adjustable screw sets the final jaw position to accommodate material tolerance variations.
Compensate for mechanical wear on a mold-handling actuator by periodically adjusting the stroke end screw, maintaining a perfect seal without replacing the entire cylinder.
Choose the SCJ250 when your application demands the highest force class in the SCJ range, with 24544 N push at 0.5 MPa. For a lighter, more compact solution, step down to the SCJ200 (15708 N push at 0.5 MPa) which uses a 40 mm rod and a PT 3/4 port. This adjustable-stroke model is ideal for heavy-duty pressing or clamping where the final stop position must be dialed in precisely during setup. If your application requires a fixed, non-adjustable stroke, the standard SC250 cylinder is a more economical choice. For this 50 mm nominal stroke, side-loading is not a primary concern, but always ensure the load is guided externally if any radial force is present.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The pull force is lower due to the area of the 50 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf.
Yes, it is a direct dimensional replacement for an SC250 of the same 50 mm nominal stroke, provided you have clearance for the slightly longer rear adjusting screw housing. You must match the PT 1 inch port, the basic mounting, and the magnet option (-S) for full sensor compatibility. The key advantage is gaining the 20 mm field-adjustable stroke range.
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