The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-20 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-20 is a large-bore, ISO 6430 class double-acting single-rod cylinder with a rear-cap adjusting screw that allows the stroke end position to be fine-tuned within a 20 mm range. At 0.5 MPa, it delivers 24544 N of push force and 23562 N on the pull stroke, driven by a 50 mm diameter piston rod. The cylinder body length A is 409 mm, and the robust tie-rod construction suits heavy-duty industrial tasks where the final stroke length must be dialled in on the machine.
This genuine AirTAC adjustable-stroke model uses a PT1 inch port and an M42x2 rod thread, with a 40 mm air cushion at each end for smooth deceleration. The 350 mm nominal stroke is well within the 1500 mm maximum for this bore, and the 20 mm adjustment range is ideal for commissioning tweaks or taking up wear in end-of-arm tooling without swapping the cylinder.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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 retract position of a large forming press platen during commissioning or after tooling changes, using the 20 mm screw adjustment to set the exact bottom-dead-centre without re-machining hard stops.
Adjust the stroke end of a heavy-duty guide actuator in a rolling mill to compensate for roller wear over time, maintaining precise material alignment with the 24544 N push force at 0.5 MPa.
Set the exact closed position of a large industrial butterfly valve by adjusting the cylinder's stroke end on-site, ensuring tight shut-off without over-stroking the valve seat.
Step up to this 250 mm bore when the 200 mm bore’s 15708 N push at 0.5 MPa is insufficient for the load. If the application requires a fixed, non-adjustable stroke, the standard SC250X350 is the direct alternative. For guided motion or to manage side loads on this 350 mm stroke, consider an external guide rail or a dedicated guided cylinder, as the 50 mm rod can experience bending moments under off-centre loads. A drop-in replacement must match the 250 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting.
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 maximum push force at 0.9 MPa is 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the return stroke.
Yes, provided the nominal stroke and port thread (PT) match. The SCJ250X350-20 adds a 20 mm adjustable stroke-end screw on the rear cap, making the overall body length slightly longer than the fixed-stroke SC250. Ensure your mounting arrangement has clearance for the adjusting screw mechanism.
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