The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 25mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X25-30 is a heavy-duty double-acting single-rod cylinder from the ISO 6430 class, designed for applications where the stroke end position must be fine-tuned in the field. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction, allowing operators to dial in the exact stop point without replacing the cylinder or adding external hard stops. With a 50 mm diameter piston rod and a 1-inch PT port, this tie-rod cylinder delivers a substantial push force of 24544 N at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa.
The body length A for this SCJ model is 409 mm, and it features a 40 mm adjustable air cushion to decelerate high-inertia loads smoothly. The adjustable-stroke mechanism acts purely on the stroke end position; it does not alter the cylinder's force output or speed. This model is configured with the default TPU seal, PT thread, and basic mounting, making it a robust, no-frills solution for large-scale industrial actuation requiring precise end-point calibration.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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.
Used in large pneumatic presses where the final pressing depth must be precisely calibrated during commissioning or after tooling changes. The 30 mm adjustment screw allows operators to fine-tune the bottom-dead-center position for consistent part forming.
Ideal for actuating diverter gates on heavy-duty mining or aggregate conveyors. The adjustable stroke compensates for wear on the gate seal over time, ensuring a tight, leak-free closure without replacing the entire actuator.
Enables rapid mechanical stroke adjustment on large packaging or palletizing machinery when switching between product sizes. The 30 mm range provides the flexibility to set different stop positions for various pallet heights or case dimensions.
Select the SCJ250X25-30 when your machine requires a high-force linear actuator with a short, precisely adjustable stroke. If 24544 N of push force at 0.5 MPa is insufficient, stepping up is not possible as this is the largest bore in the SCJ series; instead, consider increasing operating pressure, as the cylinder is rated up to 1.0 MPa. If the force is excessive, the next bore down is the SCJ200, which provides 15708 N of push force at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC250 series is a more economical alternative. When replacing an existing unit, ensure the new cylinder matches the 250 mm bore, 25 mm nominal stroke, 30 mm adjustment range, PT port thread, and basic mounting configuration. For this short 25 mm stroke, side-loading is typically not a primary concern, but always ensure the load is guided externally if any radial forces are present.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the 50 mm piston rod reducing the effective piston area on the retract stroke, delivering 23562 N at 0.5 MPa.
The rear-cap adjusting screw physically limits the piston's forward stroke end by up to 30 mm, allowing you to shorten the 25 mm nominal stroke. It is a mechanical end-stop only and does not lock the piston rod in place. If air pressure is lost, the rod will not hold its position; an external rod brake or pilot-operated check valve is required for load holding.
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